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NETSCN84.DOC
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1991-10-12
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NETSCAN Version V84
Copyright (C) 1989, 1990, 1991 by McAfee Associates.
All Rights Reserved.
Documentation by Aryeh Goretsky.
McAfee Associates (408) 988-3832 office
4423 Cheeney Street (408) 970-9727 fax
Santa Clara, CA 95054-0253 (408) 988-4004 BBS 2400 bps
U.S.A. (408) 988-5138 BBS HST 9600
(408) 988-5190 BBS v32 9600
CompuServe GO VIRUSFORUM
InterNet mcafee@netcom.com
SYNOPSIS
NETSCAN is a virus detection and identification program for local
and wide area networks. NETSCAN will search any networked drive
accessible as a DOS device, searching the networked drive(s) for
known viruses.
NETSCAN works by searching the system for instruction sequences
or patterns that are unique to each computer virus, and then reporting
their presence if found.
NETSCAN version V84, when used in conjunction with the VIRUSCAN
program on workstations, can identify all 301 computer virus strains
and the 897 varieties.
For a complete listing of viruses detected, please read the
accompanying VIRLIST.TXT file.
NETSCAN can be run off of any workstation with 256Kb and DOS 2.0
or above (Some options may require DOS 3.1 or above). In order for
NETSCAN to check all areas of the server for computer viruses,
NETSCAN should be run under an account with global read, write, and
create privileges. NETSCAN works with 3Com 3/Share and 3/Open, Novell
NetWare, Banyan VINES, DEC DECNet, Microsoft LAN Manager, PC/SA,
and NFSNet as well as IBMNET and NETBIOS compatible networks. If you
do not see your network listed, contact McAfee Associates.
AUTHENTICITY
NETSCAN runs a self-test when executed. If NETSCAN has been
modified in any way, a warning will be displayed. The program will
still continue to check for viruses, though. If NETSCAN reports that
it has been damaged, it is recommended that a clean copy be
obtained.
NETSCAN versions 51 and above are packaged with the VALIDATE
program to ensure the integrity of the NETSCAN.EXE file. The
VALIDATE.DOC instructions tell how to use the VALIDATE program.
The VALIDATE program distributed with NETSCAN may be used to check
all further versions of NETSCAN.
The validation results for Version 84 should be:
FILE NAME: NETSCAN.EXE
SIZE: 50,347
DATE: 10-07-1991
FILE AUTHENTICATION
Check Method 1: 04F9
Check Method 2: 1773
If your copy of NETSCAN.EXE differs, it may have been modified.
Always obtain your copy of VIRUSCAN from a known source. The
latest version of NETSCAN and validation data for NETSCAN.EXE can
be obtained off of McAfee Associates' bulletin board system at
(408) 988-4004 or CompuServe Forum GO VIRUSFORUM.
Beginning with Version 72, all McAfee Associates programs for
download are archived with PKWare's PKZIP Authentic File
Verification. If you do not see the "-AV" message after every file
is unzipped and receive the message "Authentic Files Verified!
# NWN405 Zip Source: McAFEE ASSOCIATES" when you unzip the files
then do not run them. If your version of PKUNZIP does not have
verification ability, then this message may not be displayed.
Please contact McAfee Associates if your .ZIP file has been
tampered with.
COMMANDS
IMPORTANT NOTE: NETSCAN SHOULD ALWAYS BE RUN FROM A WRITE-PROTECTED FLOPPY
DISK TO PREVENT NETSCAN FROM BECOMING INFECTED.
To run NETSCAN type:
NETSCAN d1: ... d10: /A /CHKHI /D /E .xxx .yyy .zzz
/FR /M /NLZ /NOBREAK /NOMEM /NOPAUSE
/REPORT d:filename /UNATTEND
Options are:
/A - Scan all files for viruses
/CHKHI - Scan memory from 0 to 1088Kb
/D - Overwrite and delete infected files
/E .xxx .yyy .zzz - Scan overlay extensions .xxx .yyy .zzz
/FR - Display messages in French
/M - Scan memory for all viruses
(see below for specifics)
/NLZ - Skip scanning of LZEXE compressed files
/NOBREAK - Disable Ctrl-C / Ctrl-Brk during scanning
/NOMEM - Skip memory checking
/NOPAUSE - Disable screen pause when scanning
/REPORT d:filename - Create report of infected files
/UNATTEND - Scan network using error handler
(d1: ... d10: indicate drives to be scanned)
The /A option will cause NETSCAN to go through all files on the
referenced drive. This should be used if a file-infecting virus has already
been detected. Otherwise the /A option should only be used when checking a
new program. The /A option will add a substantial time to scanning. This
option takes priority over the /E option.
The /CHKHI option checks memory above 640Kb that can be used on
AT (286) and 386 systems for computer viruses on the workstation it is
being run from. This includes the 384Kb Upper Memory Area from 640Kb
to 1024Kb, and the 64Kb High Memory Area from 1024Kb to 1088Kb. On XT
systems with extended memory cards installed, this will cause the first
64K of RAM to be scanned again. This option can not be used with the
/NOMEM option.
The /D option tells NETSCAN to prompt the user to overwrite
and delete an infected file when one is found. If the user selects
"Y" the infected file will be overwritten with hex code C3 [the
Return-to-DOS instruction] and then deleted. A file erased by the
/D option can not be recovered. If the McAfee Associates' CLEAN-
UP program is available, it is recommended that CLEAN be used to
remove the virus instead of NETSCAN, since in most cases it will
recover the infected file. Boot sector and partition table
infectors can not be removed by the /D option and require the
CLEAN-UP virus disinfection program.
The /E option allows the user to specify an extension or set
of extensions to scan. Extensions should include the period
character "." and be separated by a space after the /E and between
each other. Up to three extensions may be added with the /E. For
more extensions, use the /A option.
The /FR option tells NETSCAN to output all messages in French
instead of English.
The /M option tells NETSCAN to check system memory of the
workstation it is running off of for all known computer viruses that
can inhabit memory. NETSCAN by default only checks memory for
critical and "stealth" viruses, which are viruses which can cause
catastrophic damage or spread the infection during the scanning
process. NETSCAN will check memory for the following viruses
in any case:
1024 1253 1554 1963
1971 2100 2560 337
3445-Stealth 4096 512 Anthrax
Anti-Tel Brain Dark Avenger Darth Vader
Disk Killer Doom2 EDV Empire
Fish6 Form Greemlin Invader
Joshi Microbes Mirror Murphy
Nomenclature Phantom Plastique Polish-2
P1R (Phoenix) Sentinel Stoned Tequila
Taiwan-3 Whale Zero-Hunt
If one of these viruses is found in memory, NETSCAN will stop and
advise the user to power down, and reboot the system from a
virus-free system disk. Using the /M option with another
anti-viral software package may result in false alarms if the other
package does not remove its virus search strings from memory. The
/M option will add 3 to 15 seconds to the scanning time.
The /NLZ option tells NETSCAN not to look inside files
compressed with the LZEXE file compression program. NETSCAN will
still check the programs for external infections.
The /NOBREAK option disables Control-C or Control-Break from
stopping VIRUSCAN while running. The /NOBREAK option only works if
BREAK=OFF has been added to the CONFIG.SYS file.
The /NOMEM option is used to turn off all memory checking for
viruses. It should only be used when a system is known to be free
of viruses.
The /NOPAUSE option disables the "More..." prompt that appears
when NETSCAN fills up a screen with data. This allows VIRUSCAN to run
on a machine with multiple infections without requiring operator
intervention when the screen fills up with messages from the NETSCAN
program.
The /REPORT option is used to generate a listing of infected
files. The resulting list is saved to disk as an ASCII text file.
To use the report option, specify /REPORT on the command line,
followed by the device and filename.
The /UNATTEND option allows NETSCAN to continue scanning when a
non-shareable open file is scanned.
NOTE: The /UNATTEND options requires DOS 3.1 and above. If your PC
is running an older version, then the /UNATTEND option will not
work.
OPERATION
NETSCAN should be run while only the supervisor account is active
on the network.
NETSCAN will require approximately 3 minutes of run time for each
1,000 files on the designated drive.
EXIT CODES
NETSCAN will set the DOS ERRORLEVEL upon program termination
to:
ERRORLEVEL | DESCRIPTION
-----------+--------------------------
0 | No viruses found
1 | One or more viruses found
2 | Abnormal termination (program error)
If a user stops the scanning process, NETSCAN will set the ERRORLEVEL
to 0 or 1 depending on whether or not a virus was discovered prior
to termination of the scan.
LICENSE
NETSCAN may be copied and distributed for testing on a trial basis.
If you choose to use NETSCAN, a license is required. Licenses are available
for internal use within a business, organization, government agency, or
for external use by repair centers or other service organizations. License
fees will vary depending on the size of the network or number of copies of
NETSCAN required. For information contact:
McAfee Associates (408) 988-3832 office
4423 Cheeney Street (408) 970-9727 fax
Santa Clara, CA 95054-0253 (408) 988-4004 BBS 2400 bps
U.S.A. (408) 988-5138 BBS HST 9600
(408) 988-5190 BBS v32 9600
CompuServe GO VIRUSFORUM
Internet mcafee@netcom.com