Sophos OS/2 Anti-Virus User manual

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Dokument

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User manual

Sophos Anti-Virus for OS/2

For networked and single computers

Document date: February 2007

About this manual

Using Sophos Anti-Virus

1 Using Sophos Anti-Virus via the GUI

2 Using Sophos Anti-Virus via the CLI

3 Using InterCheck

4 Disinfection

Configuration

5 Immediate and scheduled scanning options (GUI)

6 Global configuration options (GUI)

7 Configuration via the CLI

8 Configuring InterCheck

Troubleshooting

9 Troubleshooting

Glossary and index

Glossary

Index

Technical support

Sophos Anti-Virus OS/2 user manual

About this manual

This user manual explains how to use Sophos Anti-Virus for OS/2 and how to configure

virus scanning

virus alerts

reporting

disinfection

logging.

The manual also provides help in resolving common problems.

For information on the installation, initial setup, updating or uninstallation of

Sophos Anti-Virus on an OS/2 network, see the Sophos Anti-Virus OS/2

computers on a network installation guide.

For information on the installation, initial setup, updating or uninstallation of

Sophos Anti-Virus on a single OS/2 computer, see the Sophos Anti-Virus

OS/2 single user installation guide.

Sophos documentation is published on the Sophos Anti-Virus

Supplementary CD and at www.sophos.com/support/docs/

Using Sophos Anti-Virus

Using Sophos Anti-Virus via the GUI

Using Sophos Anti-Virus via the CLI

Using InterCheck

Disinfection

Sophos Anti-Virus OS/2 user manual

1 Using Sophos Anti-Virus via the GUI

This section contains the following information about using Sophos

Anti-Virus for OS/2 via the GUI.

Overview of the Sophos Anti-Virus window (section 1.1).

Running an immediate scan (

section 1.2

Scheduling scans ( section 1.3

1.1 Overview of the Sophos Anti-Virus window

1.1.1 Opening the Sophos Anti-Virus window

1. On the desktop, double-click the Sophos Anti-Virus for OS/2 icon.

2. In the Sophos Anti-Virus for OS/2 folder, double-click the Show Sophos

Anti-Virus window icon.

To scan the computer immediately, double-click the Scan this computer

with Sophos Anti-Virus icon.

1.1.2 Features of the Sophos Anti-Virus window

Button bar

Tabs

File list

Sophos Anti-Virus OS/2 user manual

On-screen log

Button bar

Starts a scan. Ends a scan.

Opens a dialog box in which you can configure Sophos Anti-Virus.

Connects you to the Sophos virus analyses on the Sophos website.

Tabs

There is a tabbed page for each type of scan:

Immediate for scanning on demand.

Scheduled for scanning automatically at set times.

You cannot control or configure InterCheck on-access scanning via the

Sophos Anti-Virus window. See

section 8

for information about configuring

InterCheck.

Sophos Anti-Virus OS/2 user manual

File list

On the Immediate tabbed page, the file list shows items that can be scanned. An illuminated light to the left of an entry indicates that it will be included in an immediate scan. Click this light to select or deselect items.

On the Scheduled tabbed page, the file list is replaced with the scheduled job list. This is the list of scheduled scans configured to take place on the computer.

On-screen log

The on-screen log contains information about the current session, along with all log messages since the window was opened. Double-clicking on a virus name here connects you to an analysis of the virus on the Sophos website.

Sophos Anti-Virus OS/2 user manual

1.2 Running an immediate scan

To run an immediate scan, first ensure the Immediate tabbed page is selected.

The path list shows the drives, paths and files that can be scanned in an immediate scan. An illuminated light to the left of an item indicates that it will be scanned. Click this light to select or deselect items.

1.2.1 Starting an immediate scan

To scan all the selected drives, click GO.

To scan an individual item in the area list, whether the light beside it is illuminated or not, double-click that item.

Interrupting scanning

To stop scanning at any time, click STOP.

Sophos Anti-Virus OS/2 user manual

1.2.2 Adding and editing items for immediate scanning

To add new items for immediate scanning, or edit existing items, ensure the

Immediate tabbed page is selected and click the Add or Edit button. The

Edit item details dialog box is displayed.

Path name

Specifies the drive, folder or filename to be scanned. Both drive-mapped and

UNC path names can be entered. Wildcards can also be included. Click

Browse to select from a list of available items. Use the drop-down menu to select Local hard drives, rather than specific paths.

File types

By default, only files defined as executables are scanned, unless you select

All. To find out how to change the list of files defined as executables, see

section 6.2

Subfolders

Select this option to scan subfolders.

1.2.3 Removing items for immediate scanning

Highlight (by clicking) the name of the path to be removed and click the

Remove button.

Sophos Anti-Virus OS/2 user manual

1.3 Scheduling scans

To view or edit scheduled jobs, first ensure the Scheduled tabbed page is selected.

1.3.1 Default scheduled mode job list

By default, there is a job named ‘Default’, which scans all local hard drives.

See

sections 1.3.3 and 1.3.4

for details of how to modify or remove this job.

1.3.2 Adding a new scheduled job

1. Click the Add button on the Scheduled tabbed page.

2. Enter the name of the job in the Enter new job name dialog box.

3. In the Job Configuration dialog box, use the tabs to set up the job.

The options in the Job Configuration dialog box are explained in section 5 .

Sophos Anti-Virus OS/2 user manual

1.3.3 Editing a scheduled job

Highlight (by clicking) the name of the scan and click the Edit button, or double-click the name of the scan. The Job Configuration dialog box is displayed, in which you can edit the scan.

1.3.4 Removing a scheduled job

Highlight (by clicking) the name of the job to be removed and click the

Remove button.

Sophos Anti-Virus OS/2 user manual

2 Using Sophos Anti-Virus via the CLI

This section describes how to run immediate scans from the command line on workstations or on a file server.

This section describes how to run immediate scans with the default settings. In most cases, these settings are sufficient. To find out how to

change the default settings, see section 7 .

2.1 What are the defaults?

By default, Sophos Anti-Virus will look for viruses in:

nearly 50 types of file identified by their filename extension

logical sector 0 of all local hard disk drives

physical sector 1 of hard disk devices 80 to 83 Hex.

See

section 7

to find out how to change these defaults.

Scanning level

By default, Sophos Anti-Virus performs a quick scan, which checks only those parts of files likely to contain viruses. This is usually sufficient. See

section 7.6

for details.

2.2 Scanning hard disks

Enter the command

OSWEEP

This starts a scan of all local hard drives. To interrupt the scan, press ‘Esc’ at any time.

To scan specific local or network hard drives, use their letters. For example

OSWEEP D: E:

If a virus is found, a red warning message is displayed at the end of the scan. To clear the warning, press any key. The names of viruses discovered are then displayed.

Sophos Anti-Virus OS/2 user manual

2.3 Scanning floppy disks

Enter the command

OSWEEP -MU A:

You are then prompted to insert the disks you want to scan.

2.4 Scanning file servers

You can scan file server logical drives over a network. On most networks it is necessary to be logged in as a supervisor or have read rights equivalent to those of a supervisor (the latter is more secure if the workstation itself is infected).

Most networks do not allow file server boot sectors to be examined. Sophos

Anti-Virus determines automatically to which network drives such restrictions apply. You can force Sophos Anti-Virus to treat all drives as network drives during a scan by using the -FS command line qualifier.

On most networks, some files are not readable and Sophos Anti-Virus will report an error when it tries to open them. It automatically avoids the files

\EA#DATA.#SF

\WP#ROOT.#SF

\OS2\SYSTEM\SWAPPER.DAT

on all drives (where the # symbol represents the space character).

Any files can be exempted from a scan by quoting them, preceded by the

exclusion operator, in the SWEEP.ARE file. For more information see

section

7.4

A quick way to find unreadable files on the file server is to run a scan and note the names of any file(s) that could not be opened.

Maximum effectiveness is obtained by running Sophos Anti-Virus on the file server itself in stand-alone mode. For instructions on disinfecting a system in stand-alone mode, see

section 4.2

Sophos Anti-Virus OS/2 user manual

2.5 Running Sophos Anti-Virus on a file server

Sophos Anti-Virus for OS/2 can be installed on a LAN Server or LAN

Manager file server as an integral part of an anti-virus strategy. Although

Sophos Anti-Virus does not contain any network-specific features, the LAN server environment encourages the use of different techniques for controlling the operation of the virus scanner.

Scheduling

You can schedule regular scans using the AT command, provided by the

Network Operating System. For example, the following instruction will run a scan at midnight each day and place the output in the file OSWEEP.LOG:

AT 00:00 /E:M,T,W,Th,F,S,Su "C:\SAV\OS2SWEEP\ENG\OSWEEP -P=C:\SAV\OSWEEP.LOG"

The red alert message is displayed if a virus is detected. The log file should then be examined to determine which files are infected. Full pathnames must be specified. The instruction can be added to the startup command file so that it will be executed automatically every time the server is started.

Background Operation

Sophos Anti-Virus can be configured to run continually as a background process. A command file is required to restart the scan. The following is a simple example file that scans continuously until a virus is detected.

@ECHO OFF

:START

C:\SAV\OS2SWEEP\ENG\OSWEEP -PR=L -P=C:\SAV\OSWEEP.LOG

IF ERRORLEVEL 3 GOTO VIRUS_FOUND

GOTO START

:VIRUS_FOUND

The qualifier

-PR=L changes the priority of the scan to low, so that the impact on server performance is reduced. It is not advisable to run the command file as a detached process since it cannot easily be monitored or terminated. The command should be run in the background instead. To ensure the command file is executed every time the server is started, add the following line to the startup command file

START /MIN RUNSWEEP.CMD

where RUNSWEEP.CMD is the command file.

The command file can easily be customised to take additional actions when a virus is encountered.

Sophos Anti-Virus OS/2 user manual

3 Using InterCheck

InterCheck checks files for viruses as they are accessed by the computer, and denies access to a file if it contains a virus. InterCheck also scans removable disks for boot sector viruses, and denies access to a whole disk if it contains an infected boot sector. To find out how to configure InterCheck, see

section 8 .

Do not run more than one on-access scanner at any one time. This could cause serious problems with your system, or even prevent OS/2 from booting.

If InterCheck finds a virus, it displays a message like this:

Click OK. Deal with the virus as explained in section 4 .

Notification to network administrators of viruses is done using the network’s native messaging utility. When infected files are accessed frequently, in extreme cases the capacity of the messaging system may be exceeded.

Although this means some infected files may not be reported to the network administrator, they will be made aware of which computers store infected files. They can then check the InterCheck log on those computers, which contains a definitive record of all viruses found and other important events.

Running InterCheck can slow down a computer, especially when it is starting up. To avoid this, configure the OS/2 file systems to use large caches, using the command DISKCACHE= and/or the /CACHE= qualifier of the IFS= command in CONFIG.SYS. Sophos recommends a value of 2048 in each case, or 1024 if computer memory is limited. See the IBM OS/2

Command Reference Guide for more information.

InterCheck does not scan the contents of archive files before the archive files are unpacked. (However, it does scan the extraction ‘stub’ of self-extracting

Sophos Anti-Virus OS/2 user manual

archives prior to extraction.) This is because such a process could be too slow for an on-access scanner. After archive files have been unpacked with the archive utility, InterCheck prevents access to any of the unpacked files that are infected, so that security is maintained.

Sophos does not recommend using InterCheck on a file server as it is likely to reduce performance. Files held on servers will be scanned by clients running InterCheck when they access the files.

InterCheck is designed to prevent multiple virus alerts due to repeated attempts by a user to access the same infected file. For more information,

see the InfectedCacheLifetime= command in section 8 .

InterCheck only scans files when they are opened: it does not scan them when they are closed. In practice, this means that files are scanned before they are read, not when they are created.

InterCheck does not automatically disinfect infected items.

Because the standard releases of OS/2 are not high security products,

InterCheck does not give complete security against the activities of malicious users (e.g. a knowledgeable user can disable InterCheck on their computer).

InterCheck is believed to be compatible with third-party security products that use the OS/2 Installable Security Subsystem. Where such a product is installed, it is possible that it could be used to protect InterCheck against malicious users. However, Sophos does not endorse any such product.

It is not necessary to disable the ‘opportunistic lock’ feature of IBM LAN

Server networking to enable InterCheck to work. This is of particular significance for computers running IBM Peer Server.

3.1 Monitoring InterCheck

To confirm that InterCheck is active, in the InterCheck Monitor window, check the Status field.

By default, InterCheck Monitor is launched on OS/2 at bootup.

If it is not running, on the desktop, in the Sophos Anti-Virus for OS/2 folder, double-click InterCheck Monitor.

Sophos Anti-Virus OS/2 user manual

InterCheck Monitor displays

the total number of items filtered (i.e. checked against the list of authorised items by InterCheck)

the status of InterCheck (active or inactive)

the last item filtered.

To display the InterCheck Monitor menu, click the left-hand side of its title bar. You can open the Sophos Anti-Virus window from this menu.

Closing InterCheck Monitor does not stop InterCheck.

Sophos Anti-Virus OS/2 user manual

4 Disinfection

This section provides some general information about disinfection.

It does

not explain how to disinfect a computer of specific viruses, as disinfection methods are varied and can be virus-specific.

It is recommended that you get information about the virus (see below), then either use the Sophos website for help with disinfection or contact

Sophos

technical support .

4.1 Getting information about the virus

If the Sophos Anti-Virus GUI finds a virus, it displays a message box like this:

You also see details in the on-screen log at the bottom of the Sophos

Anti-Virus window.

Sophos Anti-Virus OS/2 user manual

If command line Sophos Anti-Virus finds a virus, it displays a message like this:

Sophos Anti-Virus

Version 3.90.0

Virus data version 3.90, February 2005

Includes detection for 99603 viruses, trojans and worms

System time 20:16:25, System date 16 February 2005

Quick Sweeping

Press Esc to quit

>>> Virus 'EICAR-AV-Test' found in file F:\EICAR.COM

9 files swept in 0 minutes and 1 second.

1 virus was discovered.

1 file out of 9 was infected.

For advice consult www.sophos.com, email [email protected]

or telephone +44 1235 559933

First isolate the infected computers from the network and internet.

Write down the name of the virus. Then, from an uninfected computer, look up its virus analysis on the Sophos website. The virus analysis search page is located at www.sophos.com/virusinfo/analyses

You can go straight to this page by double-clicking the Sophos Virus

Information Website icon in the Sophos Anti-Virus for OS/2 folder.

The analysis tells you what types of files the virus infects, and provides information about disinfection. It may also include a link to detailed disinfection instructions. Use these instructions to help you disinfect the computer. If there are no instructions, contact Sophos

technical support .

4.2 Disinfection

Sophos Anti-Virus’s automatic disinfection facilities, or OS/2 commands, can deal with most virus attacks.

Infected boot sectors can be disinfected (in some cases) or disabled.

Infected documents can be disinfected.

Some infected programs can be disinfected.

Infected files can be deleted.

You cannot disable boot sectors from the Sophos Anti-Virus GUI.

Sophos Anti-Virus OS/2 user manual

If you are using the Sophos Anti-Virus window, specify automatic disinfection in the Job Configuration dialog box (described in

section 5.4

Then run an immediate scan of the infected area (described in

section 1.2

If using Sophos Anti-Virus from the command line, or if automatic disinfection is unsuccessful, see the rest of this section for more information about disinfection.

4.2.1 Dealing with boot sector viruses on the hard disk

There are two ways to deal with boot sector viruses on the hard disk; by disinfection or by replacing the boot sector.

Disinfection

This is the preferred approach. Before disinfection, backup any important data on the hard disk. This procedure assumes that A: is the floppy disk and

E: is the CD.

1. If OS/2 is already running, shut it down.

2. Boot OS/2 from the OS/2 Utility disk set. The disks should include a CD driver and the following files: NLS.DLL, QUECALLS.DLL, and

VIOCALLS.DLL. Follow the on-screen instructions. When booting is finished, the A: prompt appears.

3. Insert the Sophos Anti-Virus Supplementary CD.

4. At a command prompt, enter

SET BEGINLIBPATH=A:\;E:\OS_2

This tells OS/2 where to find the files mentioned in step 2.

5. Enter

E:\OS_2\OSWEEP -DI

The computer is scanned for boot sector and file viruses. Sophos Anti-Virus disinfects infected boot sectors and some programs (see

section 4.2.3

). If

this procedure fails to disinfect a virus on your computer, contact Sophos

technical support .

Sophos Anti-Virus OS/2 user manual

Replacing the boot sector

In most cases, the boot sector can be overwritten with a clean one.

1. Check that the contents of the infected drive are visible (e.g. with DIR).

If the contents of the hard disk are not visible, contact Sophos

technical support

for advice. Some boot sector viruses require additional action for full recovery.

To overwrite the master boot sector, ensure the last OS/2 Utility Disk is in the drive and enter:

FDISK /NEWMBR or, in the case of Warp Server for e-business or Warp 4 Convenience

Packages

LVM /NEWMBR

To overwrite the OS/2 boot sector, locate the OS/2 Utility disk containing the file SYSINSTX.COM.

For Warp 3 and Warp Server v4, this will be the third of the three Utility disks.

For Warp 4 (Merlin), Warp Server for e-business and Warp 4

Convenience Packages, this will be the first of the four Utility disks.

Insert this disk in drive A: and enter a command such as:

SYSINSTX C:

4.2.2 Dealing with boot sector viruses on floppy disk

Floppy disks with infected boot sectors can be either disinfected or reformatted.

Disinfection

This procedure assumes that A: is the floppy disk and E: is the CD.

1. If OS/2 is already running, shut it down.

2. Boot OS/2 from the OS/2 Utility disk set. The disks should include a CD driver and the following files: NLS.DLL, QUECALLS.DLL, and

VIOCALLS.DLL. Follow the on-screen instructions. When booting is finished, the A: prompt appears.

3. Insert the Sophos Anti-Virus Supplementary CD.

Sophos Anti-Virus OS/2 user manual

4. At a command prompt, enter

SET BEGINLIBPATH=A:\;E:\OS_2

This tells OS/2 where to find the files mentioned in step 2.

5. Enter

E:\OS_2\OSWEEP A: -DI -MU

6. When the computer prompts you, insert the floppy disks to be disinfected.

Infected boot sectors and programs are disinfected.

7. When disinfection is complete, scan the whole computer for remaining infections.

If this procedure fails to disinfect a virus on your floppy disk, contact Sophos

technical support .

Reformatting

1. If OS/2 is already running, shut it down.

2. Boot OS/2 from the OS/2 Utility disk set. Follow the on-screen instructions.

When booting is finished, the A: prompt appears. Remove the OS/2 Utility disk.

3. Copy the valuable data from the infected disk to a clean destination (it is safe to copy files if the computer has been clean booted).

4. Reformat the infected disk.

4.2.3 Dealing with infected programs

Sophos Anti-Virus can disinfect some infected programs. However, disinfected programs may be unstable, and put valuable data at risk. We recommend that disinfection of programs is used only as a temporary measure, and that you subsequently replace disinfected programs from original installation disks, a clean computer or sound backups.

1. To disinfect an infected program, enter

OSWEEP [PROG.EXE] -DI where

[PROG.EXE]

is the program name.

2. Scan the whole computer for remaining infections.

Sophos Anti-Virus OS/2 user manual

3. If the program cannot be disinfected, delete the program using

OSWEEP [PROG.EXE] -REMOVEF and replace it from original installation disks, a clean computer or sound backups. The virus may have corrupted it.

-REMOVEF affects infected files only, and can be used on network drives from the workstation. It does not require OS/2 to be shut down, unless a file to be removed is locked (e.g. an OS/2 system file). In this case, contact

Sophos

technical support .

If the -RS qualifier is specified as well, infected files will be positively overwritten rather than simply deleted. This makes them irrecoverable.

In either case, you are asked to confirm that each file should be removed, unless the -NOC (No confirmation before virus removal) qualifier is used.

4.2.4 Dealing with infected documents

When dealing with infected documents, it is not necessary to reboot from a clean system disk. However, it is important to ensure that the application that created the document is not open when disinfection is attempted.

To disinfect a document file, use a command such as

OSWEEP FILE.DOC -DI

In some cases, it is possible to manually edit the macros from the infected document using the relevant application. However, some macro viruses now operate a form of stealth to prevent users from doing this. For example,

Winword/ShareFun disables the Macro option on the Tools menu, and

Templates option on the File menu. Consult Sophos

technical support

before attempting to perform manual disinfection of macro viruses.

4.2.5 Dealing with an infected Boot Manager

Almost all known viruses execute in DOS mode. OS/2 systems with Boot

Manager configured are vulnerable to attack while DOS is running. For example, the common virus Form can damage the Boot Manager.

If the OS/2 Boot Manager is infected, do as follows. This procedure assumes that A: is the floppy disk and E: is the CD.

1. If OS/2 is already running, shut it down.

2. Boot OS/2 from the OS/2 Utility disk set. The disks should include a CD driver and the following files: NLS.DLL, QUECALLS.DLL, and

VIOCALLS.DLL. Follow the on-screen instructions. When booting is finished, the A: prompt appears.

Sophos Anti-Virus OS/2 user manual

3. Insert the Sophos Anti-Virus Supplementary CD.

4. At a command prompt, enter

SET BEGINLIBPATH=A:\;E:\OS_2

This tells OS/2 where to find the files mentioned in step 2.

5. Enter

E:\OS_2\OSWEEP -DI

The computer is scanned for boot sector and file viruses. Sophos Anti-Virus disinfects infected boot sectors and some programs (see

section 4.2.3

). If

this procedure fails to disinfect Boot Manager, continue to step 6.

6. Ensure the last OS/2 Utility Disk is in the drive.

7. Use the OS/2 FDISK (or LVM) utility to delete and reinstall the Boot

Manager. Detailed instructions are in IBM’s OS/2 documentation. If this

procedure fails to disinfect Boot Manager, contact Sophos technical support .

4.3 Recovering from virus side effects

How you recover from a virus infection depends on how the virus affected the infected computer. Some viruses leave you with no side effects to deal with. Others have such extreme side effects that you have to restore a hard disk or replace the BIOS in order to recover.

Some viruses gradually make minor changes to data. This type of corruption can be very hard to detect. Read the virus analysis on the Sophos website www.sophos.com

, and check files carefully after disinfection.

Sound backups are crucial. If you did not have them before you were infected, ensure you create or obtain them in case of future infections.

Sometimes you can recover data from disks damaged by viruses. Sophos can supply utilities for repairing the damage caused by some viruses.

Contact Sophos

technical support

for help.

Sophos Anti-Virus OS/2 user manual

Configuration

Immediate and scheduled scanning options (GUI)

Global configuration options (GUI)

Configuration via the CLI

Configuring InterCheck

Sophos Anti-Virus OS/2 user manual

5 Immediate and scheduled scanning options (GUI)

This section describes how to configure two modes of scanning:

Immediate scanning.

Scheduled scanning (for which you specify a different configuration for each scheduled job).

The different scanning modes are described in

section 1 .

This section also describes how to set up scheduled scanning on multiple computers on the network.

For information on further, global options (e.g. to exclude files from all forms

of scanning), see section 6 .

There are Job Configuration dialog boxes for immediate scanning and each scheduled job. They enable you to specify which items Sophos Anti-Virus should scan and what action it should take on discovering a virus.

To open the required configuration dialog box, in the Sophos Anti-Virus window, click the tab for the scanning mode you would like to configure.

If you clicked the Scheduled tab, select the job that you want to configure.

Then click the Configuration button.

The sub-sections in this section describe each tabbed page you will find in the configuration dialog boxes. Some tabbed pages are only available for scheduled scanning.

Sophos Anti-Virus OS/2 user manual

5.1 File list (scheduled mode only)

The File list tabbed page enables you to specify the items to be included in a scheduled scan. It is used in the same way as the file list on the

Immediate tabbed page of the Sophos Anti-Virus window ( section 1.1.2

To add items to the list, click Add and specify an item or items in the item details dialog.

To remove an item, highlight it and click Remove.

To edit an item, double-click it, or highlight it and click Edit, then edit it in the Edit item details dialog box.

The options in the Edit item details dialog box are described in

section 1.2.2

Sophos Anti-Virus OS/2 user manual

5.2 Time (scheduled mode only)

The Time tabbed page enables you to set the times and days on which a scheduled job should take place.

Sophos Anti-Virus OS/2 user manual

5.3 Mode

The Mode tabbed page enables you to configure scanning options for immediate or scheduled scans.

Quick scanning checks only those parts of each file that are likely to contain viruses. This level is sufficient for normal operation.

Full scanning examines the complete contents of each file. This level is more secure but is much slower than Quick.

Full scanning is needed in order to detect some viruses, but should only be enabled on a case-by-case basis (e.g. on advice from Sophos technical support).

Priority

High priority gives Sophos Anti-Virus precedence over any other applications.

Normal priority gives Sophos Anti-Virus the same priority as other applications.

Low priority reduces impact on system performance by ensuring that scanning only occurs when the system is otherwise idle.

Sophos Anti-Virus OS/2 user manual

Scan inside archive files

Select this option if you want to scan inside archive files.

The archive types that can be checked include: ARJ, compress, gzip, LHA,

Microsoft Compress, RAR, self-extractors, tar, UUEncode and Zip. See the readme file for the latest details. To enable Sophos Anti-Virus to scan inside only specific archive types, including Microsoft Cabinet files, see

section

7.11.4

Sophos Anti-Virus can also scan archive files nested in archive files. Use

Maximum archive depth to set the number of levels of nested files (between

0 and 32). The default is 16.

Sophos Anti-Virus does not recognise archives nested to a greater depth than the maximum you specify and will not scan inside them.

Scan mailboxes

Select this option if you want Sophos Anti-Virus to scan emails and attachments in Outlook Express mailboxes.

Sophos Anti-Virus OS/2 user manual

5.4 Action

The Action tabbed page enables you to specify the action immediate or scheduled scanning will take on finding a virus.

Disinfect boot sectors

Sophos Anti-Virus can disinfect boot sectors on floppy and hard disks automatically. A hard disk cannot be disinfected if any files on it are active.

If disinfection of a hard disk fails, follow the instructions for disinfection in

section 4.2.1

Disinfect documents and programs

Sophos Anti-Virus can disinfect some programs and documents infected with most types of macro virus.

Check the contents of any disinfected documents carefully, as the virus may have corrupted them.

Delete any disinfected programs and replace them from backups, as the virus may have corrupted them.

Infected files

If an infected file is found, it can be deleted or shredded automatically.

Shredding is a secure type of file deletion that overwrites the file.

Sophos Anti-Virus OS/2 user manual

If you choose to delete or shred files, Sophos Anti-Virus does not attempt to disinfect them first, even if you select disinfection as well. However,

Sophos Anti-Virus does not delete or shred infected mailboxes.

Request confirmation

If this is selected, Sophos Anti-Virus will ask for confirmation before it does anything with infected items. The request is made before each immediate scan. This option is not available for scheduled scanning.

Sophos Anti-Virus OS/2 user manual

5.5 Notify

The Notify tabbed page enables you to configure the alerts sent on discovery of a virus.

To send alerts, Sophos Anti-Virus runs a batch file after each infected item is found, at the end of the job in which the viruses are found, or both. There are separate batch files for the two forms of notification.

To create these file(s), open a text editor and create a batch file.

The following parameters can be used in the first batch file (run after each infected item):

%2 machine name job name

%4 virus name location

The file NTFY.CMD, used by InterCheck to report viruses, is suitable for use as the per-item batch file.

Sophos Anti-Virus OS/2 user manual

The following parameters can be used in the second batch file (run at the end of the job):

%3 machine name job name items (number of items scanned) viruses (number of viruses found) errors report file

Notify timing

The notification message can be a summary report sent at the end of each job and/or a message for every infected file found.

Use the browser to specify the batch file that will be run.

Sophos Anti-Virus OS/2 user manual

5.6 Report

The Report tabbed page enables you to configure the contents of the report file for each immediate or scheduled job. This file is generated in addition to the continuous log file.

Report mode

Select List filenames to configure Sophos Anti-Virus to record in the report file the name of every item examined. By default, only infected items are recorded.

Report file

Use this option to specify the location of the report file. This file is deleted and recreated each time a job is run.

Sophos Anti-Virus OS/2 user manual

5.7 Copying scheduled jobs to multiple computers on the network

If you have a central installation directory (CID) from which you installed the

Sophos Anti-Virus GUI on OS/2 computers, you can set up scheduled jobs on one computer and copy them to all the other computers.

So that any virus reports display the correct computer name, on each computer on the network, in the file CONFIG.SYS, add

SET HOSTNAME=xxx where xxx

is a computer-specific name. (If your OS/2 computers use IBM

LAN Server or TCP/IP networking, or you set up central virus reporting

(Sophos Anti-Virus OS/2 computers on a network installation guide), this should have been done already.) Restart each computer for this change to take effect.

1. At a computer where the Sophos Anti-Virus GUI is installed, open the

Sophos Anti-Virus window.

2. Set up the required scheduled jobs. (For further configuration options, see

section 6 .)

3. Close the Sophos Anti-Virus window.

4. Copy the file SWEEP.CFG from the installation directory on this computer, by default C:\SAV\OS2SWEEP\ENG, to the CID on the server, by default

C:\SAVCID\OS2INST.

5. Change directory to the CID. Enter

SETUP -UPDATE

The server and the workstations detect the changes and are updated with the new configuration.

Sophos Anti-Virus OS/2 user manual

6 Global configuration options (GUI)

This section describes global configuration options accessible from the menu bar in the Sophos Anti-Virus window. It contains the following information:

How to change the location of the Sophos Anti-Virus log folder (section

6.1).

How to change the files defined as executables for all scanning modes

( section 6.2

How to exclude files or file types from scanning by all scanning modes

( section 6.3

How to set the machine name used by Sophos Anti-Virus alerts (

section

6.4

How to clear the Sophos Anti-Virus log ( section 6.5

How to set the web browser and language used to display virus analyses

( section 6.6

How to disable the progress bar displayed during a scan ( section 6.7

It also lists the Sophos Anti-Virus command line qualifiers (

section 6.8

6.1 Set log folder

Sophos Anti-Virus maintains a continuous log of all its activity. This log file contains administrative messages along with on-screen messages.

By default the log file is saved in the directory in which Sophos Anti-Virus was installed (the default is C:\SAV). This can be changed by clicking Set

Log Folder on the File menu.

In the Log Folder dialog box, type in or browse to the path to the required log folder location.

Sophos Anti-Virus OS/2 user manual

6.2 Executables

To edit the list of filename extensions treated as executables, on the Options menu, click Executables.

Then specify extensions in the dialog box.

This list is used only if Sophos Anti-Virus is set to check executable rather than all file types. (Checking only executable types is the default.) See

section 1.2.2

to find out how to change this setting. The list does not apply

to the command line interface or InterCheck.

The list is automatically updated with filename extensions associated with new viruses, whenever you update Sophos Anti-Virus. If you edit the list as explained above, and you subsequently want to revert to the default list, click Default.

6.3 Exclusion list

The exclusion list is a list of specific files to be excluded from immediate and scheduled scanning. To edit it, on the Options menu, click Exclusion

List.

Then add or remove items in the Exclusion List dialog box.

The list does not apply to the command line interface or InterCheck.

Sophos Anti-Virus OS/2 user manual

6.4 Machine name

If Sophos Anti-Virus is configured to notify other users of virus finds, it is useful to identify the computer where the virus has been found. To do this, on each computer on the network, in the file CONFIG.SYS, add

SET HOSTNAME=xxx where xxx

is a computer-specific name.

Restart each computer for this change to take effect. This method ensures all the components of Sophos Anti-Virus for OS/2 use the computer name.

It is also possible to use the Machine Name option on the Options list to set the machine name. However, this only applies to virus finds reported by the

GUI.

6.5 Clear log

The on-screen log provides a record of activity in the current session and reflects the information that is appended to the continuous log file. This option clears the on-screen log but does not affect the continuous log file on disk.

6.6 Virus library

To configure the web browser and language used to display the virus analyses on the Sophos website, on the Options menu, click Virus Library to display the Virus Library Viewer Configuration dialog box.

Choose the web browser by typing the path of the browser program in the

Web browser command text box or by using the Browse button. The default is the computer’s default browser, if one has been set. To use the OS/2 internet dial-up feature, precede the path of the browser program with

‘linkup’, for example linkup C:\netscape\program\netscape.exe

Sophos Anti-Virus OS/2 user manual

Do not choose the IBM Web Explorer browser, because it cannot display the

Sophos web pages properly.

Choose the language by clicking the drop-down arrow on the Language for

virus analyses box and selecting the appropriate language.

6.7 Progress bar

In order to display the progress bar, Sophos Anti-Virus has to count all the items to be scanned before starting the scan. On large network drives this can take a significant length of time, which can be saved by disabling this option. This will not affect any Sophos Anti-Virus jobs that are already running at the time the option is disabled.

This option is set separately for immediate mode and each scheduled job.

6.8 Immediate and scheduled scan command line qualifiers

You can use the command SWEEP to start the Sophos Anti-Virus scan scheduler and to open the Sophos Anti-Virus window. When you use this command, certain command line qualifiers can be used to configure scanning and reporting.

Either ‘-’ or ‘/’ can be used when entering a qualifier, i.e. /AUTO and -AUTO are identical.

-AUTO

Starts scanning when the Sophos Anti-Virus window is opened, using the most recent configuration set at the Immediate tabbed page.

-EXEJOB <jobname>

Starts the scheduled job named <jobname> when the Sophos Anti-Virus window is opened instead of waiting until the scheduled time.

The -EXEJOB and -AUTO qualifiers cannot both be used; if both are included in the command line, -EXEJOB will be ignored.

-CLOSE

Closes both the Sophos Anti-Virus window and the background scheduler.

If Sophos Anti-Virus is not running, errorlevel 1 is returned. All other qualifiers are ignored.

Sophos Anti-Virus OS/2 user manual

-CF<config file>

Specifies a name and path for the configuration file.

If the program cannot open the file, Sophos Anti-Virus will be started with default options, and on exit will try to create a configuration file with the given path and filename.

-NOWIN

Starts the background scheduler only.

-LOGPATH <path>

Enables the user to alter the stored (or default) location of the log file,

SWEEP.LOG. The new path will be stored in the configuration file.

-REPORTPATH<path>

Enables the user to enter a default path for the (job) report files. This path will be used when no path is entered for a report file in the appropriate dialog.

Sophos Anti-Virus OS/2 user manual

7 Configuration via the CLI

This section describes how to configure Sophos Anti-Virus from the command line or with an area file. It describes how to:

specify which items should be scanned (sections 7.1 to 7.5)

specify full or quick scanning ( section 7.6

)

run scanning at different priorities ( section 7.7

)

use new virus identities or patterns ( sections

7.8

and 7.9

)

disinfect or remove files ( section 7.10

It also lists all the Sophos Anti-Virus command line qualifiers and error codes

(

sections 7.11

and

7.12

For information on default settings, see

section 2.1

7.1 Specifying what Sophos Anti-Virus will check

Users can specify which items will be scanned using either

the command line, or

an area file, SWEEP.ARE.

The command line enables the user to specify drives, directories, files or drive sectors. It can also include the command line qualifiers listed in this section.

The SWEEP.ARE file enables the user to specify what will be scanned in greater detail, down to the level of a byte or group of bytes.

7.2 Specifying items to be checked in the command line

Items to be checked can be specified in the command line. For example, to check the file ISVIRUS.BIN type

OSWEEP ISVIRUS.BIN

or to check all executable files on drives D: and E: type

OSWEEP D: E:

Make sure that any symbols used do not conflict with the OS/2 meaning. For example, do not use the recursion symbol ‘>’ in the command line, as it means redirection in OS/2.

When the items to be checked are specified, all default settings will be overridden unless the -AS qualifier is added to the command line.

Sophos Anti-Virus OS/2 user manual

7.3 Specifying items to be checked in SWEEP.ARE

Items to be checked can be specified in an area file, SWEEP.ARE. This must reside in the current drive and subdirectory. For example, if the current drive and directory is C:\PROGS, SWEEP.ARE must reside on the C: drive in the directory C:\PROGS.

When the items to be scanned are specified, all default settings will be overridden unless the -AS qualifier is added to the command line.

The SWEEP.ARE file can be edited as required. The syntax for describing areas to be checked is given in the following sections. For example,

SWEEP.ARE may contain

D:|0

D:>*.EXE

D:>*.OVL

+81 0 0 1 which will check the boot sector on drive D:, all EXE and OVL files on drive

D: and physical sector 1 on the second hard disk.

The | symbol is the OS/2 pipe operator and is not the same as 1 (one) or l

(letter l).

Drives can also be specified in the command line. For example, to check drives A: and D: while Sophos Anti-Virus is on drive C:, type

OSWEEP A: D:

Note that a default drive can precede any areas defined in the SWEEP.ARE

file which do not already specify a drive. For example, if SWEEP.ARE

contains

*.*

D:|0 and the user issues the command (see -AD command line qualifier for a full explanation)

OSWEEP -AD=A then SWEEP will check

A:*.*

D:|0

Sophos Anti-Virus OS/2 user manual

7.4 Specifying files to be checked in SWEEP.ARE

Particular file types and areas can be specified in SWEEP.ARE using the normal OS/2 descriptions. For example

C:\*.ABC

makes Sophos Anti-Virus examine all files with extension .ABC in the root directory of drive C:.

The recursion operator ‘>’ can be used to specify that all subdirectories, as well as the current directory, should be searched. For example, if the entry

C:*.ABC

is specified, and the disk in drive C: contains two subdirectories,

only the

current directory will be searched for ABC files. On the other hand, if the entry

C:>*.ABC

is specified, not only the current directory but also both subdirectories will be searched for ABC files. Similarly, if the entry

C:\MYAREA\MYFILES\>*.ABC

is specified, the search will cover the subdirectory C:\MYAREA\MYFILES and all its child directories.

Remember that the more files specified, the longer it will take to check the system.

To check all executable files (COM, EXE, OV?, SYS, DLL, DRV, IFS, etc) specify

C:"All executables"

Sweeping is about 30% faster than when each group is specified individually. The drive specification (C: in above example) is optional.

Excluding files from checking

Certain files or directories can be excluded from checking, by preceding the description with the ‘<’ exclusion operator. For example

C:\>*.EXE

<C:\DONOT.EXE ; will not be examined will recursively search all EXE files except DONOT.EXE in the root directory of drive C:. If the name of a file without a drive or path is specified, all files or directories with that name will be excluded.

Sophos Anti-Virus OS/2 user manual

For example

<FOO.EXE

; file FOO.EXE will be excluded

; in whatever drive and

; directory it may appear

<C:FOO.EXE

; FOO.EXE will be excluded in

; the current directory of

; drive C

<\J\FOO.EXE

; FOO.EXE will be excluded if

; found in the \J directory of

; the current drive

<J\FOO.EXE

; FOO.EXE will be excluded if

; found in the J subdirectory

; of the current directory on

; the current drive

Wildcard characters cannot be used with the exclusion operator.

Any exclusion descriptors which contain the ‘\’ symbol and do not specify a drive will have the drive specified in the -AD command line qualifier inserted. For example, if SWEEP.ARE contains

<\NU.EXE

and Sophos Anti-Virus is started with the command line qualifier

OSWEEP -AD=C: the file which will be excluded will be C:\NU.EXE. This is equivalent to entering

<C:\NU.EXE

in the SWEEP.ARE file.

7.5 Specifying disk sectors to be checked in SWEEP.ARE

At a lower level than the file structure, disks are organised into sectors. The most important of these are the master boot sector and the partition boot sector, as they contain executable program code which many viruses attack.

A floppy disk has only a partition boot sector.

Sectors can be referred to in two different ways: as logical sectors or as absolute sectors. A logical sector number refers to the position of the sector

Sophos Anti-Virus OS/2 user manual

within a particular drive or partition. This is useful when referring to the partition boot sector, which is logical sector 0 of the partition. The absolute specification of a sector is in terms of the cylinder, head and sector of its physical position on the specified device. While more complex than a logical sector number, it allows any sector on the disk to be specified. This is important for checking the master boot sector, which can be found at cylinder 0, head 0, sector 1. On hard disks this sector is not accessible using a logical sector number. On floppy disks, absolute sector 0,0,1 and logical sector 0 are the same physical sector.

Specifying logical sectors to be checked

To specify a particular logical sector or set of sectors, use the ‘|’ symbol (the

OS/2 pipe operator). It is also possible to specify a byte or group of bytes to be checked in each sector (for example if the sector contains variable information). The format of the specification is drive | ssector esector sbyte ebyte where

drive is the drive letter, e.g. C: (optional)

ssector is the first logical sector to be checked

esector is the last logical sector to be checked (optional)

sbyte is the first byte to be checked (optional)

ebyte is the last byte to be checked (optional).

All values must be in decimal format.

For example

C:|0 specifies that the whole of logical sector 0 on drive C: should be checked, whereas

C:|0 10 specifies that a check should be taken of logical sectors 0 to 10 inclusive, and

C:|0 10 271 275 specifies further that in each of the logical sectors 0 to 10, only bytes 271 to 275 inclusive should be checked.

Sophos Anti-Virus OS/2 user manual

The following specification would check logical sector 15 on drive A:, checking only byte number 536 within that sector:

A:|15 15 536

The start- and end-sectors have been specified the same.

In addition, the following can be used on all drives except network drives

This checks all disk sectors within the current logical disk, and should be used with care, because it might find virus fragments in deleted files, and might cause false positives.

Specifying absolute sectors to be checked

To specify an absolute sector, use the ‘+’ symbol followed by the drive number, the cylinder (or ‘track’) number, the head (or ‘side’) number and the sector number within that cylinder. The first floppy disk drive in the system is number 0, the second is number 1, and so on. The first physical hard disk drive is number 80, the second is number 81 and so on. It is also possible to specify a byte or group of bytes to be checked in the sector (for example if the sector contains variable information).

The format of the specification is

+drive cylinder head sector sbyte ebyte where

drive is the disk drive number

cylinder is the cylinder number

head is the head number

sector is the sector number

sbyte is the first byte to be checked (optional)

ebyte is the last byte to be checked (optional).

All values must be in hexadecimal format.

Sophos Anti-Virus OS/2 user manual

For example

+80 0 0 1 specifies that sector 1 of cylinder 0, head 0 on the first fixed disk (usually drive C:) should be checked, whereas

+1 0 0 1 23 1B7 specifies that a check should be taken of bytes 23 hex to 1B7 hex inclusive on sector 1 of cylinder 0, head 0 on the second floppy-disk drive (usually drive B:).

To check master boot sectors on drives 80 to 83 Hex, specify

C:"All master boot sectors"

If a particular drive is not present, no error message is produced.

7.6 Full and quick scanning

Quick scanning checks only those parts of each file that are likely to contain viruses. This is the default setting and is sufficient for normal operation.

Full scanning examines the complete contents of each file. This level is more secure but is much slower than Quick.

Full scanning is needed in order to detect some viruses, but should only be enabled on a case-by-case basis (e.g. on advice from Sophos technical support).

A full scan can be selected with the command line qualifier -F . See section

7.11.3.

7.7 Running Sophos Anti-Virus at different priorities

When a scan is run, it is scheduled by OS/2 to run with the same priority as any other OS/2 application, such as a word processor. Network servers run at a high priority in order to achieve rapid response.

Sophos Anti-Virus should be run in high priority mode if a virus is suspected on your system and the user wishes to run the scan as soon as possible and as fast as possible, without shutting the system down. Use the command line qualifier -PR=H.

OSWEEP -PR=H

Sophos Anti-Virus will run with the same high priority as the network software, but at a lower priority than any real-time processes.

Sophos Anti-Virus OS/2 user manual

Scanning should be run in low priority (lower than any other task) if the user wishes to check constantly for virus presence, without affecting the system performance. Use the command line qualifier -PR=L.

OSWEEP -PR=L

This makes Sophos Anti-Virus run only when OS/2 would otherwise be idle.

7.8 Scanning with new virus identity files

See the Sophos Anti-Virus OS/2 computers on a network installation guide or the Sophos Anti-Virus OS/2 single user installation guide for information about updating Sophos Anti-Virus with new virus identity files (IDEs). To specify the location of the IDEs that Sophos Anti-Virus should use, use the command

line qualifier -IDEDIR (section 7.11.3).

7.9 Scanning with new patterns

The range of patterns checked by Sophos Anti-Virus can be extended by creating a file called SWEEP.PAT containing the patterns in the format

Name Hex1 Hex2 ... Hexn ; Comments where

Name is the pattern name (no spaces allowed)

Hex1 etc are pattern bytes in hexadecimal, 2 hex digits per byte, most significant nibble first

; Comments are any comments after the ‘;’

Pattern bytes can be separated by spaces or tabs. A name can contain up to

15 characters and a pattern can be up to 24 bytes long.

If the line starts with a space or a tab, the pattern will have the name

‘Noname n’ where n is a number from 0 upwards.

For example, SWEEP.PAT may contain

ABC_Virus 26 83 88 9c 9f f9 f0 23

HAL_Virus ABCDEF0123456789 ; comment

SWEEP.PAT must reside in the current drive and subdirectory. For example, if the current drive and directory is C:\PROGS and drive A: is being checked using the command

OSWEEP A: then SWEEP.PAT must reside on the C: drive in the directory C:\PROGS.

Sophos Anti-Virus OS/2 user manual

Sophos Anti-Virus looks for patterns only when it is run in full scanning mode (quick is the default). The -F qualifier must be specified. For example

OSWEEP C: -F

7.10 Virus disinfection and removal

Common boot sector viruses can be removed from hard and floppy disks, and macro viruses from documents, by using Sophos Anti-Virus’s built-in disinfection capability. To do this, run OSWEEP with the command line qualifier -DI.

Sophos Anti-Virus can also be used to delete infected programs while the system is running. This is done with the -REMOVEF qualifier.

7.11 Sophos Anti-Virus command line qualifiers

When you use the command OSWEEP, certain command line qualifiers can be used to control and/or automate the scanning process. The qualifiers are described in the following subsections, or can be listed using

OSWEEP -?

The command format is

OSWEEP drive file1 ... filen qua1 ... quan where

drive is the optional drive which will be checked (A:, B:, C: etc) and ‘*:’ denotes all local hard drives

file1 to filen are optional descriptors of files checked

qua1 to quan are optional command line qualifiers (all beginning with either a hyphen ‘-’ or a slash ‘/’)

The order of the items after OSWEEP is unimportant, except for the

qualifiers for archive types (see section 7.11.4

For example

OSWEEP A: scans the floppy disk in drive A: while

OSWEEP -P=ALL.LOG -NS scans all local hard disks, listing each file in the file ALL.LOG.

Sophos Anti-Virus OS/2 user manual

7.11.1 @file Command line qualifiers from an external file

Sophos Anti-Virus can obtain its command line qualifiers from an external text file. For example

OSWEEP @SWEEP.CM E: when the file SWEEP.CM contains

-NS -NK

C: D:

-P=SWEEP.LOG

is equivalent to

OSWEEP -NS -NK C: D: -P=SWEEP.LOG E:

Command files can contain any number of items per line (up to the maximum number of characters permitted per line).

7.11.2 Command files compared with .ARE files

Both .ARE files and command files can contain the symbols ‘<’ (exclusion),

‘>’ (subdirectory recursion) and ‘|’ (logical sector specification).

.ARE files contain exactly one item per line; command files can contain any reasonable number.

Command files can contain qualifiers (-NS, -NK etc); .ARE files cannot.

.ARE files can contain specifications containing spaces, e.g. +80 0 0 1, ‘All executables’, and comments; command files cannot.

7.11.3 List of command line qualifiers to OSWEEP

-? Help

Sophos Anti-Virus displays all command line qualifiers and a short description of their function.

-A Append report

By default, any security report written to a file by Sophos Anti-Virus will be overwritten by a subsequent report written to a file of the same name.

Specifying the -A qualifier in the command line, for example

OSWEEP -A -P=FOO.REP

appends the new report to the old file FOO.REP, rather than overwriting the old report with the new one.

Sophos Anti-Virus OS/2 user manual

If this is used in an automatic process, this file should be pruned from time to time to stop it taking up ever more disk space, especially if the -NS command line qualifier is used.

-AD=<drive> Area file default

Any files or areas listed in the SWEEP.ARE file are assumed to be in the specified drive, unless they have an explicitly stated drive.

For example

OSWEEP -AD=X would assume that all areas refer to drive X.

-AF=<filename>Area file

The default area file is called SWEEP.ARE. The -AF qualifier can be used to specify a different name.

7.11.4 Command line qualifiers for specific archive types

By default, Sophos Anti-Virus does not scan inside the archive types in the following table. To enable Sophos Anti-Virus to scan inside a specific archive type, use the appropriate qualifier.

To enable Sophos Anti-Virus to scan inside all the archive types in the table except Microsoft Cabinet and InstallShield Cabinet files, use the

-ARCH

qualifier instead (section 7.11.3). You can also use this with the specific archive type qualifiers to more easily specify which archive types should be scanned. In this case, the qualifiers are processed from left to right. For example

OSWEEP -ARCH -NZIP directs Sophos Anti-Virus to scan inside all archive types except Zip when it does a scan.

Sophos Anti-Virus OS/2 user manual

OSWEEP -NZIP -ARCH directs Sophos Anti-Virus to scan inside

all archive types when it does a scan.

A R J b z i p 2 c g

I n o z i m s t p p a l r e l S s h i s e l d C a b i n e t

T A Z , Z

G Z , T G Z

C A B

I T S S ( c o m p r e s s e d h e l p ) C H M , H X S

L H A L H A , L Z H

P e l

i c i c

r o r o

M f -

i v

e x

s o s o f t f t

t y

t r a c

a b o m t o r s t a r

U n i x a r c h i v e s

U U E n c o d e

Z i p i n e t p r e s s

F e i l x e n

A R J

a m t e n s e i o n s

B Z 2 , T B Z , T B Z 2

Q u a

e n a

l i

b l

f i

e r t o s c a n n i n g

Q u a l i f i e r t o

d i s a b l e

s c a n n i n g

Z I

P 2

N A R J

N B Z I P 2

A R

S C

I T

I P

F X

A B

S S

H A

M Z

G Z

A B

S C

A R

P M

A R

U A R

U E

I P

M P

N C

N I

M Z

G Z

N T A R

N U A R

N U

N Z

U E

I P

S C A B

N I T S S

N L H A

N C A B

N M S C M P

N R A R

N R P M

N S F X

Sophos Anti-Virus OS/2 user manual

7.12 Error codes returned by SWEEP

Sophos Anti-Virus returns error codes that can be tested by using the IF

ERRORLEVEL command in batch files. This enables automatic action to be taken if Sophos Anti-Virus discovers an abnormal condition.

0 If no errors are encountered and no viruses found.

1 If the user interrupts the execution by pressing ‘Esc’.

2 If a corrupt or password-protected file is encountered, or if some error preventing further execution is discovered.

3 If viruses or virus fragments are discovered.

These return values can be tested by using the IF ERRORLEVEL command.

For example

@ECHO OFF

OSWEEP -NK

IF ERRORLEVEL 3 GOTO FISHY

IF ERRORLEVEL 1 GOTO SOMEERR

ECHO No problems

GOTO END

:SOMEERR

ECHO Some error has occurred

GOTO END

:FISHY

ECHO Something has been discovered

:END

This batch file will print

Something has been discovered if Sophos Anti-Virus discovers a virus,

Some error has occurred in the event of an error, or

No problems if nothing is discovered. The -NK qualifier tells Sophos Anti-Virus not to pause for a key if viruses are discovered.

Extended error codes

A different set of error codes are returned if Sophos Anti-Virus is run with the

-EEC command line qualifier.

Sophos Anti-Virus OS/2 user manual

0 No errors have occurred and no viruses have been found.

8 Survivable errors have occurred.

16 Password-protected files have been found. (They are not scanned.)

20 Viruses have been found and disinfected.

24 Viruses have been found and not disinfected.

32 OSWEEP has failed an integrity check.

36 Unsurvivable errors have occurred.

40 Execution has been interrupted.

Sophos Anti-Virus OS/2 user manual

8 Configuring InterCheck

This section describes how to configure InterCheck on-access scanning and lists the options that you can set.

8.1 How to configure InterCheck

InterCheck is configured via the file INTERCHK.CFG, located on the workstations, in the same directory as Sophos Anti-Virus and InterCheck.

If the workstations have been set to update from a central installation directory (CID), there is also a central copy of INTERCHK.CFG in the CID.

Whenever the InterCheck on-access scanner is installed or updated by a workstation from the CID, the central copy of INTERCHK.CFG is copied to the workstation, facilitating centralised configuration of INTERCHK.CFG.

You must run the following command after carrying out any changes to this file in the CID

SETUP -UPDATE to ensure the workstations detect the changed file.

The file is not case-sensitive.

It has four sections:

[InterCheckGlobal]

[InterCheckWorkstation]

Recognised by all workstations

Recognised by one or more named workstations

Recognised by all OS/2 workstations

[InterCheckOS2Global]

[InterCheckOS2Workstation]

Recognised by one or more named OS/2 workstations

The square brackets are part of the section names.

The two section names [...workstation] must be followed by a line

Address=xxx

Where xxx is the name of a workstation that will recognise the section. A section may include several address lines if more than one workstation is required to recognise the section.

Sophos Anti-Virus OS/2 user manual

In OS/2 InterCheck the workstation name is specified by the line

SET HOSTNAME=xxx which must be included in the file CONFIG.SYS on each computer. Restart the computer for this change to take effect. You may find this line has already been inserted by the Sophos Anti-Virus installer.

The file contains some information by default, which is explained in section

8.2.

8.2 Configuration options for InterCheck for OS/2

The default InterCheck configuration file is as shown below.

NetworkNotification=YES

When InterCheck finds a virus, it will run the batch file NTFY.CMD in the

CID, and send a virus notification to a named workstation.

This file may also be run if a virus is found during an immediate or scheduled scan.

StatusWindow=YES

InterCheck Monitor runs constantly, recording the last file scanned by

InterCheck.

VirusPopUp=YES

When InterCheck finds a virus, a popup virus alert is displayed at the workstation.

To change any of these settings, change YES to NO.

Sophos Anti-Virus OS/2 user manual

You can add other commands to the file, as described below. If you have any non-OS/2 computers, you should also see the shared configuration

options listed in section 8.3

AppendLogfile=YES | NO

Normally when the OS/2 InterCheck scanner starts, it starts a new log file

(the previous log is renamed with a .BAK extension, and previous .BAK logs are deleted). This may throw away valuable information about viruses found previously on this computer, so this option enables InterCheck to keep the existing log and append information to it each time the scanner starts. If this option is used, the log file can grow slowly until it fills the user’s disk, unless the user prunes it from time to time. For this reason the default is not to append, but to start a new file each time the scanner starts.

CheckNetwork=YES | NO

If set to YES (default), both files on file servers (network drives or UNC paths) and files on local drives will be scanned before access is allowed. If set to NO, only files on local drives will be scanned (set to NO only if it can be assumed that files on file servers have already been scanned at the server).

Exclude=<path>

Excludes files from being scanned. Access is always allowed immediately, and there is no record of whether the file is infected. This option is used to exempt critical files which are known to contain non-infectable data or text, and which are intensively used. If this is not done, some applications

(particularly legacy or poor quality ones) may run extremely slowly or even hang. The choice of files to be exempted is made by experiment if an application performs poorly.

Several Exclude entries may be given, one for each group of files to be excluded. A group is specified by use of wild cards * and/or ? in the filename, in the normal OS/2 way. The following forms of entry are accepted: d: Exclude all files on drive d: a*b.?c – Exclude files matching a*b.?c in any directory on any drive.

d:a*b.?c – Exclude files a*b.?c in any directory on drive d:

\dir1\dir2\a*b.?c – Exclude files a*b.?c in directory \dir1\dir2 on any drive.

d:\dir1\dir2\a*b.?c – Exclude files a*b.?c in directory \dir1\dir2 on drive d:

A filename of ‘*’ is interpreted as ‘*.*’ (any file).

Sophos Anti-Virus OS/2 user manual

A filename of ‘*.’ means any file with a blank extension.

If a directory path is given it must be absolute (begin with a ‘\’).

If a directory is given, a filename must be given as well.

It is not possible to specify a directory subtree in a single entry (OS/2 has no way to do this).

InfectedCacheLifetime=n

The OS/2 InterCheck scanner remembers the names of infected files it has found, so as not to produce duplicate reports (OS/2 itself can make several attempts to access a single infected file). This memory is erased after the number of seconds specified with this lifetime qualifier, so that the user is reminded about the infected file when trying again to access it after a period of time. This is particularly important in the case of removable disks, which may be replaced in a drive inadvertently. The default memory lifetime is

5 seconds. The minimum lifetime is 1 second and the maximum is

2147483647 seconds (effectively disabling the reminder).

LogFile=<path>

Specifies the drive, directory and name of the log file. The defaults for the drive and directory are those where the InterCheck programs are installed.

The default for the filename is INTERCHK.LOG.

LogLevel=0..5

Controls the amount of information written to the log file.

0 nothing except startup messages

1 fatal errors

2 virus alerts

3 nonfatal errors

4 warnings (default)

5 information messages (the maximum amount of information will be logged)

Each level also logs the information in all the levels above it.

ScanMode=FULL | QUICK

Controls the scanning level used to scan for viruses. Full scans the complete contents of each file. Quick scans only those parts of each file that are most likely to contain viruses. The default is quick.

Sophos Anti-Virus OS/2 user manual

StartUpReport=NONE | NORMAL | VERBOSE

Controls the amount of configuration information logged when the

InterCheck scanner starts. Default is VERBOSE.

NONE No information logged.

NORMAL Program banner and version, version of main virus data, number of viruses recognised.

VERBOSE The above, plus the virus engine version, plus a list of all virus identity files (IDEs) loaded.

WorkThreads=n

This sets the number of file access operations that can be processed simultaneously by the OS/2 InterCheck scanner. The default is 10, which should not normally be changed except under the advice of Sophos technical support. Using too small a value will probably cause the user’s computer to hang, so that a restart would be required.

8.3 Configuration options shared with other versions of InterCheck

The [InterCheckGlobal] and [InterCheckWorkstation] sections are shared with versions of InterCheck that run on other operating systems. If you use only OS/2, you should use only OS/2-specific sections and the options

described in sections 8.

1 and 8 .2

CheckNetwork=YES | NO

Same as above.

Exclude=

Same as above. Other versions of InterCheck may accept only simple exclusion specifications: a?b.c – filename only; only ‘?’ is recognised as a wild card.

d: – all files on drive d:

PopUpDisplay=OFF

Same as VirusPopUp= above. ERROR and VERBOSE both mean YES.

StartUpDisplay=NONE | NORMAL | VERBOSE

Same as StartUpReport= above.

Sophos Anti-Virus OS/2 user manual

SweepVxDLogFile=<path>

Same as LogFile= above.

SweepVxDLogLevel=0..5

Same as LogLevel= above.

SweepVxDMode=FULL | QUICK

Same as ScanMode= above.

Troubleshooting

Sophos Anti-Virus OS/2 user manual

9 Troubleshooting

This section provides answers to some common problems that you may encounter when using Sophos Anti-Virus for OS/2.

If your problem is not described in this section, refer to the Sophos website www.sophos.com

which includes a support knowledgebase, virus analyses, the latest IDEs, product downloads and technical articles.

If your problem is not described on the website, contact Sophos technical support .

9.1 Sophos Anti-Virus runs slowly

Full scan

By default, Sophos Anti-Virus performs a quick scan, which scans only the parts of each file that are likely to contain viruses. However, if scanning is set to full, it scans everything, and takes significantly longer to carry out a scan.

Full scanning is needed in order to detect some viruses, but should only be enabled on a case-by-case basis (e.g. on advice from Sophos technical support).

Checking archive files

If checking of archive files is enabled, every archive will be unpacked to the depth specified. Scanning may therefore take much longer than if this option is not selected.

Checking all files or all sectors

If Sophos Anti-Virus has been configured to check all files and/or all sectors, it will take longer than if only checking executable files.

Sophos Anti-Virus OS/2 user manual

9.2 Virus fragment reported

If a virus fragment is reported, contact Sophos technical support for advice.

The report of a virus fragment indicates that part of a file matches part of a virus. There are three possible causes:

Variant of a known virus

Many new viruses are based on existing ones, so that code fragments typical of a known virus may appear in files infected with a new one. If a virus fragment is reported, it is possible that Sophos Anti-Virus has detected a new virus, which could become active.

Corrupted virus

Many viruses contain bugs in their replication routines that cause them to infect target files incorrectly. An inactive portion of the virus (possibly a substantial part) may appear within the host file, and this is detected by

Sophos Anti-Virus. A corrupted virus cannot spread.

Database containing a virus

When running a full scan, Sophos Anti-Virus may report that there is a virus fragment in a database file.

Sophos Anti-Virus OS/2 user manual

Glossary and index

Sophos Anti-Virus OS/2 user manual

Glossary

Boot sector virus

Boot sector

CMD

Hexadecimal

A type of computer virus which subverts the initial stages of the boot process. A boot sector virus attacks either the master boot sector or the DOS boot sector.

The part of the operating system which is first read into memory when a PC is switched on (booted). The program stored in the boot sector is then executed, which loads the rest of the operating system from the system files on disk.

The extension given to ‘command’ filenames in OS/2.

A command file may be written in the OS/2 scripting language REXX, or may simply contain a series of

OS/2 commands. STARTUP.CMD is a special command file which is executed whenever OS/2 is started, and can be used to configure OS/2 to a user’s requirements.

A system of counting using number base 16. The numbers 10 to 15 are represented by the characters

‘A’ through ‘F’ respectively. Hexadecimal is often abbreviated to Hex. Each Hex digit is equivalent to four bits (half a byte) of information.

IDE

InterCheck/InterCheck Client A component of Sophos Anti-Virus that intercepts files as they are accessed, and grants access only to those that are virus free.

LAN

Virus identity file; enables Sophos Anti-Virus to detect a specific virus. You need IDEs to protect your computer against viruses discovered since your version of Sophos Anti-Virus was compiled.

Local Area Network; a data communications network covering a limited area (up to several kilometres in radius) with moderate to high data transmission speeds.

Macro virus

Master boot sector

Polymorphic virus

SWEEP

UNC

Virus pattern

Sophos Anti-Virus OS/2 user manual

A type of virus that uses macros in a data file to become active in memory and attach itself to other data files. Unlike other types of virus, macro viruses can attain a degree of platform independence.

The first physical sector on the hard disk (sector 1, head 0, track 0) which is loaded and executed when the PC is booted. It contains the partition table as well as the code to load and execute the boot sector of the ‘active’ partition. Common point of attack by boot sector viruses.

Self-modifying encrypting virus.

The component of Sophos Anti-Virus that provides immediate and scheduled virus scanning and disinfection.

Universal Naming Convention; a standard system for naming network drives, e.g. the UNC directory

\\MAIN\USERS\ would refer to the USERS directory on the server called MAIN.

A sequence of bytes extracted from a virus and used for virus recognition.

Sophos Anti-Virus OS/2 user manual

Index

absolute sector 47

scanning 49

archive files

scanning 16, 32, 74

scanning via the CLI 54, 63

boot manager

boot sector

checking all files 10, 74

via the CLI 54

compressed files

scanning via the CLI 63

Diet 63

disinfection 19–25, 56

automatic 33–34

on systems with boot manager 24

disk sectors

checking via the CLI 47

documents

disinfection 20, 24, 33

email scanning 32

excluding files from scanning 14, 40

executables

files treated as 40

limiting scanning to 10

file server

checking via the CLI 14, 57

floppy disk

checking via the CLI 14

disinfecting boot sectors 22

full scan 13, 31, 50, 74

via the CLI 57

hard disk

checking via the CLI 13

disinfecting boot sectors 21

IDE files

specifying location 57

immediate scanning 9–25

adding items for scan 10–25 removing items from scan 10

infected files

InterCheck

InterCheck Monitor 17

macro virus

master boot sector

on-access scanning

on-demand scanning 13–25

configuring 28–38

configuring via the CLI 44–66

on-screen log

clearing 41

Outlook Express mailboxes 59, 61

pattern (of virus)

positive overwriting

programs

dealing with infected 23

disinfection 33

progress bar

displaying 42

quick scan 13, 31, 50

recursive scanning

via the CLI 62

report file 37

rights on NetWare 14

scanning CD boot image 55

scheduled scanning

adding a job 11

configuring via the CLI 15, 44–66

configuring via the GUI 28–38

shredding

silent running

subfolders

Sophos Anti-Virus OS/2 user manual

virus

analyses 41

boot sector 33

disinfection 19–25, 33–34, 52, 56

pattern

removal 52, 59, 62, 63

warning 35–72

Winword/ShareFun 24

zip bombs 60

Sophos Anti-Virus OS/2 user manual

Technical support

For technical support, visit www.sophos.com/support .

If you contact technical support, provide as much information as possible, including the following:

Sophos software version number(s)

operating system(s) and patch level(s)

the exact text of any error messages.

Copyright 2003–2007 Sophos Group. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise unless you are either a valid licensee where the documentation can be reproduced in accordance with the licence terms or you otherwise have the prior permission in writing of the copyright owner.

Sophos and Sophos Anti-Virus are registered trademarks of Sophos Plc and Sophos

Group. All other product and company names mentioned are trademarks or registered trademarks of their respective owners.

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User manual

Sophos Anti-Virus for OS/2

Contents

About this manual

Using Sophos Anti-Virus

1 Using Sophos Anti-Virus via the GUI

1.1 Overview of the Sophos Anti-Virus window

1.1.1 Opening the Sophos Anti-Virus window

1.1.2 Features of the Sophos Anti-Virus window

1.2 Running an immediate scan

1.2.1 Starting an immediate scan

1.2.2 Adding and editing items for immediate scanning

1.2.3 Removing items for immediate scanning

1.3 Scheduling scans

1.3.1 Default scheduled mode job list

1.3.2 Adding a new scheduled job

1.3.3 Editing a scheduled job

1.3.4 Removing a scheduled job

2 Using Sophos Anti-Virus via the CLI

2.1 What are the defaults?

2.2 Scanning hard disks

2.3 Scanning floppy disks

2.4 Scanning file servers

2.5 Running Sophos Anti-Virus on a file server

3 Using InterCheck

3.1 Monitoring InterCheck

4 Disinfection

4.1 Getting information about the virus

4.2 Disinfection

4.2.1 Dealing with boot sector viruses on the hard disk

4.2.2 Dealing with boot sector viruses on floppy disk

4.2.3 Dealing with infected programs

4.2.4 Dealing with infected documents

4.2.5 Dealing with an infected Boot Manager

4.3 Recovering from virus side effects

Configuration

5 Immediate and scheduled scanning options (GUI)

5.1 File list (scheduled mode only)

5.2 Time (scheduled mode only)

5.3 Mode

5.4 Action

5.5 Notify

5.6 Report

5.7 Copying scheduled jobs to multiple computers on the network

6 Global configuration options (GUI)

6.1 Set log folder

6.2 Executables

6.3 Exclusion list

6.4 Machine name

6.5 Clear log

6.6 Virus library

6.7 Progress bar

6.8 Immediate and scheduled scan command line qualifiers

7 Configuration via the CLI

7.1 Specifying what Sophos Anti-Virus will check

7.2 Specifying items to be checked in the command line

7.3 Specifying items to be checked in SWEEP.ARE

7.4 Specifying files to be checked in SWEEP.ARE

7.5 Specifying disk sectors to be checked in SWEEP.ARE

7.6 Full and quick scanning

7.7 Running Sophos Anti-Virus at different priorities

7.8 Scanning with new virus identity files

7.9 Scanning with new patterns

7.10 Virus disinfection and removal

7.11 Sophos Anti-Virus command line qualifiers

7.11.1 @file Command line qualifiers from an external file

7.11.2 Command files compared with .ARE files

7.11.3 List of command line qualifiers to OSWEEP

7.11.4 Command line qualifiers for specific archive types

7.12 Error codes returned by SWEEP

8 Configuring InterCheck

8.1 How to configure InterCheck

8.2 Configuration options for InterCheck for OS/2

8.3 Configuration options shared with other versions of InterCheck

Troubleshooting

9 Troubleshooting

9.1 Sophos Anti-Virus runs slowly

9.2 Virus fragment reported

Glossary and index

Glossary