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READIC.TXT
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1998-08-25
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Sophos InterCheck Release Notes
-------------------------------
Version 4.02, 20 August 1998
Contents
--------
1. Installation and upgrade
2. Modifications from version 3.12
3. Known Problems
4. Compatibility issues
5. Acknowledgments
1. Installation and upgrade
---------------------------
Version 4.02 of InterCheck requires:
Sweep version 3.12 or above.
Please consult the appropriate SWEEP manual for instructions on
installing InterCheck.
2. Modifications from version 3.12
----------------------------------
i. 'On-the-fly' disinfection
----------------------------
This version of InterCheck supports 'on-the-fly' disinfection for
stand-alone Windows and Windows 95 InterCheck clients. This option
is disabled by default. It can be enabled using the following
configuration file options IN THE SWEEP VXD SECTIONS (see below):
DisinfectDocuments=YES|NO
When this option is enabled the Sweep VxD will try to disinfect
Word/Excel viruses.
DisinfectDisks=YES|NO
When this option is enabled the Sweep VxD will try to disinfect
boot sector viruses.
For example, to enable both forms of disinfection for all users
running Windows 95, use the following in INTERCHK.CFG:
[SweepVxDW95Global]
DisinfectDocuments=YES
DisinfectDisks=YES
These configuration options are only valid in the Sweep VxD
configuration sections of the InterCheck configuration file. The
Sweep VxD section identifiers are described later.
All documents reported as having been disinfected should be
reviewed to ensure that the virus made no changes to the content.
Disinfection of boot sector viruses is not supported for NEC
PC-9800 series machines.
ii. New user Interface for Windows 95/98 InterCheck clients
-----------------------------------------------------------
Windows 95/98 InterCheck clients have a new user interface. This
is fully described in the manual supplement "New GUI for Windows
95/98 InterCheck" which is available in PDF format.
iii. Novell IntraNetWare/Client32 support
-----------------------------------------
InterCheck is now fully compatible with the Novell IntraNetWare
client and the Novell NetWare Client32 network drivers for DOS,
Windows and Windows 95.
iv. Support for the NEC PC-9800 series computers
------------------------------------------------
The InterCheck for Windows 95/98 client has been modified to
operate correctly on NEC PC-9800 series computers. However, not
all the standard InterCheck functions are available; requesting
authorisation messages are not displayed in full screen DOS boxes
and InterCheck does not prevent a restart when an infected
floppy disk has been left in the floppy drive.
Disinfection of boot sector viruses is not supported for NEC
PC-9800 series machines.
v. Automatic installation
-------------------------
The iclogin program can now be used from a login script to
automatically install the stand-alone Windows 95 InterCheck client
on a workstation. This option is enabled using the '-9' command
line option. For a description of how to use this feature please
refer to the description of the iclogin '-a' option in the
appropriate SWEEP manual. The '-a' option automatically installs
the stand-alone Windows 3.x InterCheck client on a workstation.
vi. Removing the networked Windows 95 InterCheck client
-------------------------------------------------------
The networked Windows 95 InterCheck client installs an additional
VxD (icstatic.vxd) on the workstation the first time the client is
activated. Simply removing the central InterCheck installation
from the server will not remove the locally installed VxD. The
following command must be used to remove the VxD from the
workstation:
ICLOAD95 -remove
Note: The VxD must be loaded very early in the computerÆs boot
sequence to ensure that the InterCheck client can correctly
intercept all file activity. Therefore it cannot be started from
the network.
vii. Sweep VxD configuration file sections
------------------------------------------
The following section headers may be used in the InterCheck
configuration file to pass information to the SWEEP VxD.
[SweepVxDGlobal]
[SweepVxDDOSGlobal]
[SweepVxDW95Global]
[SweepVxDWorkStation]
[SweepVxDDOSWorkStation]
[SweepVxDW95WorkStation]
The distinctions between global and workstation specific sections,
and between general, DOS specific, and Windows 95 specific
sections are the same as for the InterCheck configuration section
headers.
viii. New configuration file options
------------------------------------
The following new InterCheck configuration options have been
introduced:
AllowRestartLater=YES|NO (Windows 95 ONLY)
The first time that the Windows 95 InterCheck client is used on a
workstation the computer must be restarted before InterCheck can
provide protection from viruses. By default the computer is
automatically restarted after a short delay. However, if
AllowRestartLater is YES, InterCheck allows the user to restart
the computer at a later time.
AltCommsDir=<Communication directory>
This option is now supported by the Windows 95 InterCheck client.
Please refer to the appropriate SWEEP manual for more information.
CheckFloppyOnShutdown=YES|NO (Windows 95 ONLY)
InterCheck normally checks the floppy disk in drive A: before
allowing the computer to be shut down. This feature can be
disabled by setting CheckFloppyOnShutDown to NO.
PurgeChecksumsNow (Windows 95 ONLY )
This option instructs the InterCheck loader to purge the checksums
every time InterCheck is started. The option is designed to be
used for a limited period after a virus incident in order to force
InterCheck to re-sweep all files for viruses.
RestartTimeout=<time in seconds, 0-120> (Windows 95 ONLY)
The delay before the automatic restart, described above, is
controlled by this option. The default value is 15 seconds. It
can be set to zero for an immediate restart.
UseProgramExtensionsForSweep=YES|NO
This option influences what files will be swept as InterCheck
starts. By default, InterCheck now allows SWEEP to decide what
file extensions represent files that need to be checked for
viruses. Setting UseProgramExtensionsForSweep to YES forces SWEEP
to use the list of extensions defined by the ProgramExtensions
configuration option. Please note that this represents a change in
default behaviour.
3. Known Problems
-----------------
i. Spurious Disinfection Failure Reports
----------------------------------------
InterCheck may, in some circumstances, incorrectly report that a
boot sector virus could not be disinfected when in fact the virus
had been successfully removed.
Anyone encountering this problem should temporarily remove the
floppy disk from the drive. When the disk is replaced and
subsequently used, InterCheck will re-scan for viruses and
correctly determine that the virus is no longer present.
The problem only occurs when InterCheck is used with SWEEP
version 3.13.
4. Compatibility Issues
-----------------------
i. Windows 95 and NFS Clients
-----------------------------
Using InterCheck with certain NFS Clients, including Solstice
Network Client 3.1Plus from Sun, can cause a conflict between
the networked InterCheck Client and a system component which
will cause the computer to completely stop responding.
Sophos strongly recommends that you use the stand-alone
InterCheck Client if you are using an NFS client to access the
InterCheck communications directory.
ii. Windows 95 AS/400 Client Access
-----------------------------------
When used with Windows 95 AS/400 Client Access V3 R1 M2, the
networked InterCheck client requires Service Pack level SF47544.
With previous versions of the Client Access software, the Check
Version utility (installed by default into the Startup group)
would hang the PC with InterCheck present.
The stand-alone InterCheck client cannot be used with AS/400
Client Access because the Sweep95 VxD is unable to open files
stored on the AS/400. The only solution at present is to use
the networked InterCheck client.
iii. QEMM version 6.02
----------------------
InterCheck for DOS will cause the system to hang in response to
CTL-ALT-DEL if it is loaded high using QEMM v6.02. However, the
diskette in the A drive will be checked for viruses before the
system hangs so that the integrity of InterCheck is not
compromised. There are a number of possible solutions:
a) Upgrade to QEMM version 7.
b) Load InterCheck into low memory using the LoadLow=YES
configuration option.
c) Use the QEMM nr (norom) option. However this does not work with
the stealth option.
iv. 386Max version 6.01d
------------------------
InterCheck for DOS cannot load high when version 6.01d of the
386Max memory manager has been installed. An error message "Memory
allocation error" is displayed after InterCheck has run SWEEP.
Use the LoadLow configuration option to load InterCheck into low
memory. Alternatively upgrade to 386Max version 6.02 or above.
v. NetWare 4.01
---------------
The ICLOGIN program is not compatible with the version of the
LOGIN program supplied as part of NetWare 4.01. In order to use
the ICLOGIN program you must upgrade the Novell login program to
version 4.08 or later. Version 4.08 of LOGIN.EXE can be obtained,
by all registered users of NetWare 4.01, as part of the "Novell
4.01 Upgrade kit Vol.1 No.1".
vi. MSD versions 2.10 and 2.11
------------------------------
The Microsoft diagnostic program, MSD.EXE, supplied with Windows
3.11 and DOS 6.x, does not work correctly with InterCheck. Unless
the Novell LSL driver has been loaded before installing
InterCheck, the MSD program will crash while initially examining
the system, with unpredictable results. The problem has been fixed
in version 2.13 of the MSD program, supplied with Windows 95.
vii. Other memory resident Anti-Virus products
----------------------------------------------
We do not recommend using InterCheck when other memory resident
anti-virus are active. Attempting to run multiple anti-virus
products in this manner will cause the system to run extremely
slowly. In some cases the system may also become unstable.
5. Acknowledgments
------------------
This product uses the SPAWNO routines by Ralf Brown to minimise
memory use while shelling to DOS and running other programs.
----------------
Sophos Plc, The Pentagon, Abingdon, OX14 3YP, England
Tel 01235 559933 o Fax 01235 559935
Sophos Plc, 2, Place de la Defense, BP240,
92053 Paris la Defense, France
Tel 01 46 92 24 42 o Fax 01 46 92 24 00
Sophos GmbH, Am Hahnenbusch 21, D-55268 Nieder-Olm, Germany
Tel 06136 91193 o Fax 06136 911940
Sophos Inc, 18 Commerce Way, Woburn, MA 01801, USA
Tel 781 932 0222 o Fax 781 932 0251
Sales email sales@sophos.com
Technical support email support@sophos.com
Web http://www.sophos.com/