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- NETSCAN FOR OS/2 Version 9.13V100
- Copyright (C) 1989 - 1993 by McAfee Associates
- All rights reserved.
-
- Documentation by Aryeh Goretsky.
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- McAfee Associates (408) 988-3832 office
- 3350 Scott Blvd, Bldg. 14 (408) 970-9727 fax
- Santa Clara, CA 95054 (408) 988-4004 BBS (25 lines)
- U.S.A. USR HST/v.32/v.42bis/MNP1-5
- CompuServe GO MCAFEE
- InterNet support@mcafee.COM
-
-
-
-
- TABLE OF CONTENTS:
-
-
- WHAT'S NEW . . . . . . . . . . . . . . . . . . . . . . . . . .2
- - New features added in this release
- - System Requirements
-
- OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . .3
- - Detection of known viruses
- - Detection of new and unknown viruses
-
- SYNOPSIS . . . . . . . . . . . . . . . . . . . . . . . . . . .4
- - Technical description of known virus detection
- - Technical description of new/unknown virus detection
-
- AUTHENTICITY . . . . . . . . . . . . . . . . . . . . . . . . .5
- - How to verify the OS2NSCAN.EXE program file
-
- COMMAND SUMMARY. . . . . . . . . . . . . . . . . . . . . . . .6
- - One-line description of switches
-
- OPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .8
- - Detailed explanation of switches
-
- EXAMPLES . . . . . . . . . . . . . . . . . . . . . . . . . . .13
- - Samples of frequently-used options
-
- VIRUS REMOVAL. . . . . . . . . . . . . . . . . . . . . . . . .14
- - How to manually remove a virus
-
- REGISTRATION . . . . . . . . . . . . . . . . . . . . . . . . .15
- - How to register OS2NSCAN
-
- TECHNICAL SUPPORT INFORMATION . . . . . . . . . . . . . . . .16
- - Information you should have ready when calling
-
- OBTAINING THE LATEST VERSION OF OS2NSCAN. . . . . . . . . . . .17
- - BBS, CompuServe, and Internet access to OS2NSCAN
-
- APPENDIX A . . . . . . . . . . . . . . . . . . . . . . . . . .18
- - Creating a virus string file with the /EXT option
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- Page 1
-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 2
-
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- WHAT'S NEW
-
- NETSCAN Version 9.13V100 adds detect of all viruses detected by
- VIRUSCAN that are capable of spreading over a network.
-
- Beginning with Version 9.13, we will start providing foreign
- language support for VIRUSCAN, NETSCAN, and CLEAN-UP with an
- external language file named MCAFEE.MSG. When the MCAFEE.MSG
- file is present in the same directory as the OS2NSCAN.EXE file,
- NETSCAN will automatically use the messages from the MCAFEE.MSG
- file instead of the default English (American) messages in the
- program. In order to accomodate this change, the /FR (French)
- and /SP (Spanish) language switches have been removed and two
- new files, FRENCH.MSG and SPANISH.MSG have been included with
- this release. If you wish to use a foreign language, rename the
- language file to MCAFEE.MSG. Support for other languages will
- be added in the future.
-
- Like it's DOS-based counterpart, NETSCAN (for DOS),
- OS2NSCAN searches network drives for file-infecting viruses.
- However, OS2NSCAN contains several important differences:
-
- ■ Since OS/2 operates in a protected mode environment it can
- only check its own area of memory or "memory image" for
- viruses. Viruses will not be checked for in memory on the
- workstation OS2NSCAN is run from.
-
- ■ OS2NSCAN does not have the /CHKHI, /NOMEM, or /UNATTEND
- switches that NETSCAN does.
-
- ■ The /SAVE switch does not modify the OS2NSCAN.EXE file.
- Instead, it creates a NETSCAN.INI file.
-
- ■ OS2NSCAN does not return an ERRORLEVEL for DOS batch files.
-
- Version 9.13V100 of OS2NSCAN detects all viruses that the
- current version of NETSCAN does. For a complete list of known
- viruses, refer to the enclosed VIRLIST.TXT file. For a description
- of known viruses please refer to Patricia Hoffman's Hypertext VSUM.
-
-
- SYSTEM REQUIREMENTS
-
- OS2NSCAN requires IBM OS/2 Version 2.00(GA) or above.
-
- OS2NSCAN works with 3COM 3/Share and 3/Open, Artisoft
- LANTastic, AT&T StarLAN, Banyan VINES, DEC Pathworks, Microsoft
- LAN Manager, Novell NetWare, and any other compatible network
- operating systems. Contact McAfee Associates if you do not see
- your network listed. For PC's please use SCAN for OS/2 instead.
-
- OS2NSCAN displays messages in English, French, or Spanish
-
-
- NOTE: WRITE-PROTECT THE FLOPPY DISK CONTAINING THE NETSCAN FOR
- OS/2 (OS2NSCAN.EXE) PROGRAM BEFORE SCANNING TO PREVENT IT
- FROM BECOMING INFECTED BY A COMPUTER VIRUS.
-
-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 3
-
-
- OVERVIEW (Known Virus Detection)
-
- OS2NSCAN FOR OS/2 Version 9.13V100 (filename OS2NSCAN.EXE)
- identifies all viruses detected by the current version of
- NETSCAN (for DOS). Some viruses have been modified so that
- more than one "strain" exists. Counting such modifications,
- 1,561 viruses exist.
-
- OS2NSCAN checks files, subdirectories, and volumes for
- pre-existing computer virus infections. It will identify the
- virus infecting the system and the area where it was found,
- giving the name of the virus as well as the I.D. code used with
- CLEAN-UP to remove it.
-
- Infected files can be removed using the /D switch in
- OS2NSCAN to erase the file, or with the CLEAN-UP universal virus
- removal (disinfection) program. CLEAN-UP is recommended because
- in most cases it will eliminate the virus and fully restore
- infected programs or system areas to normal operation. CLEAN-UP
- is available for both DOS and OS/2.
-
- The accompanying VIRLIST.TXT file lists describes all
- viruses identified by OS2NSCAN and their associated I.D. codes
- for removal by CLEAN-UP.
-
-
- OVERVIEW (Unknown and New Virus Detection)
-
- OS2NSCAN has three separate methods of detecting unknown and
- new viruses:
-
- ■ Validation codes which can be periodically checked against
- to look for the changes made by a virus to files or system
- areas.
-
- ■ Generic and Family virus detectors to look for new viruses
- which are derivatives of older viruses.
-
- ■ External virus signatures to insert new virus signature
- strings on a temporary basis to OS2NSCAN.
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 4
-
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- SYNOPSIS (technical description of known virus detection)
-
- OS2NSCAN detects known viruses by searching the system for
- strings (sequences of bytes) unique to each computer virus and
- reporting their presence if found. For viruses which encrypt or
- cipher their code so that every infection of the virus is
- different, OS2NSCAN uses detection algorithms (programs) that work
- by statistical analysis, heurstics, or code disassembly.
-
-
- SYNOPSIS (technical description of new/unknown virus detection)
-
- OS2NSCAN checks for new or unknown viruses by comparing
- files against previously-recorded validation (checksum) data.
- OS2NSCAN has stores its validation code in the following way:
-
- ■ 52-bytes of validation (checksum) and recovery data are
- recorded for each .COM and .EXE file. This information
- can be stored offline (e.g., on a floppy diskette)
- in a separate log file for recovery purposes. CLEAN-UP
- can restore infected files using this information.
- (see /AF, /CF, /RF switches)
-
- OS2NSCAN also checks for new or unknown viruses by looking
- for Generic or Family virus strings. These are strings that
- have been found repeatedly in different viruses. Since virus
- writers may use the older pieces of code for new viruses, this
- allows OS2NSCAN to detect viruses which have not been written.
-
- OS2NSCAN can be updated to search for new viruses by an
- External Virus Data File, which allows the user to input new
- search strings for viruses. (/EXT switch)
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 5
-
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- AUTHENTICITY
-
- Before using OS2NSCAN for the first time, verify that it has
- not been tampered with or infected by a virus by using the
- enclosed VALIDATE for OS/2 (OS2VAL.EXE) program. For
- instructions on using OS2VAL, please read the OS2VAL.DOC file.
-
- The validation results for Version 9.13V100 should be:
-
- FILE NAME: OS2NSCAN.EXE
- SIZE: 214,144
- DATE: 02-03-1993
- FILE AUTHENTICATION
- Check Method 1: 0D15
- Check Method 2: 0BCF
-
- If your copy of OS2NSCAN differs, it may have been damaged.
- Always obtain your copy of OS2NSCAN from a known source. The
- latest version of OS2NSCAN and validation data for OS2NSCAN.EXE
- can be obtained from McAfee Associates' bulletin board system
- at (408) 988-4004 or from the McAfee Virus Help Forum on
- CompuServe (GO MCAFEE), or the mcafee.COM anonymous ftp site on
- the Internet.
-
- OS2NSCAN performs a self-check when run. If OS2NSCAN has
- been modified in any way, a warning will be displayed and the
- user will be prompted to either continue or quit. OS2NSCAN can
- still check for viruses. However, if OS2NSCAN reports that it
- has been damaged, it is recommended that a new copy be obtained.
-
- Beginning with Version 72, all of McAfee Associates'
- VIRUSCAN series are archived with PKWare's PKZIP Authentic File
- Verification. If you do not see an "-AV" after every file is
- unzipped and receive the "Authentic Files Verified! # NWN405
- Zip Source: McAFEE ASSOCIATES" message when you unzip the files
- then do not use them. If your version of PKUNZIP does not have
- verification ability, then this message may not be displayed.
- Please contact us if you believe tampering has occurred to the
- .ZIP file.
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 6
-
-
- COMMAND SUMMARY
-
- IMPORTANT NOTE: WRITE PROTECT YOUR FLOPPY DISK BEFORE SCANNING
- TO PREVENT INFECTION OF THE OS2NSCAN PROGRAM.
-
- OS2NSCAN checks files on network file servers that can
- contain a computer virus. When a virus is found, OS2NSCAN
- identifies the virus and the file where it was found.
-
- OS2NSCAN examines files based on their extension. The
- default extensions supported by OS2NSCAN are .APP, .BIN, .COM,
- .EXE, .OV?, .PGM, .PIF, .PRG, .SWP, .SYS, and .XTP. Additional
- extensions can be added with the /E option, or use the /A to
- check all files.
-
-
- Valid options for OS2NSCAN are:
-
- OS2NSCAN {drive(s)} {options}
-
- {drive(s)} - Indicates a drive or drives to be scanned
-
- Options are:
-
- \ - Scan root directory and boot area only
- /? /H or /HELP - Displays help screen
- /A - Scan all files, including data, for viruses
- /AF {filename} - Store recovery & validation data to {filename}
- /BELL - Beep whenever a virus is found
- /CERTIFY - List files that do not have a validation code
- /CF {filename} - Check for viruses using recovery & validation
- data stored in {filename}
- /D - Overwrite and delete infected files
- /E .xxx .yyy - Scan overlay extensions .XXX and .YYY
- /EXT {filename} - Scan using external virus data from {filename}
- /FAST - Speed up OS2NSCAN's output
- (see below for specifics)
- /HISTORY {fname} - Create infection log {fname} appending to old log
- /NLZ - Skip internal scan of LZEXE-compressed files
- (DOS executables only)
- /NOBREAK - Disable Ctrl-C and Ctrl-Brk during scanning
- /NOEXPIRE - Do not display expiration notice
- /NOPAUSE - Disable screen pause when scanning
- /NPKL - Skip internal scan of PKLITE-compressed files
- (DOS executables only)
- /REPORT {fname} - Create infection log {fname} deleting the old log
- /RF filename - Remove recovery & validation data stored
- /SAVE - Save specified options as new default options
-
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-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 7
-
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- /SUB - Scan all subdirectories inside a subdirectory
- @{filename} - Scan using options from {filename}
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 8
-
-
- OPTIONS
-
- Following is a detailed description of OS2NSCAN's options.
- Please note the /AF and /AG switches modify executable files.
- This may cause other anti-viral programs to generate a warning.
-
- /A - This option checks all files on the drive scanned and also
- examines a greater portion of files. This substantially
- increases the time required to scan disks and also increases
- OS2NSCAN's ability to detect viruses in overlay files. It is
- recommended this switch only be used when installing software
- or if a file-infecting virus has been found. This option takes
- priority over the /E option.
-
- /AF {filename} - This option logs recovery and validation
- data for .COM and .EXE files of a disk to a user-specified file.
- The log file size is about 20Kb per 1,000 files validated.
- Recovery from a virus using the /AF information requires the
- CLEAN-UP program.
-
- /BELL - This option tells OS2NSCAN to beep when a virus is found.
-
- /CERTIFY - This option will audit a system for files that have
- validation codes added to them with SCAN FOR OS/2'S /AG or /AV
- switches. Files that have no validation code will be reported as
- being uncertified by OS2NSCAN.
-
- /CF {filename} - This option checks recovery and validation data
- stored by the /AF option in {filename}. If a file or system
- area has changed, OS2NSCAN reports that a viral infection may
- have occurred. Using the /CG option adds about 25% more time to
- scanning.
-
- NOTE: Dual Boot systems change the Boot Sector between DOS and
- OS/2 depending on which operating system is currently
- active. This will cause OS2NSCAN to report that the boot
- sector has been modified.
-
- /D - This option tells OS2NSCAN to prompt the user to overwrite
- and delete an infected files. Files erased by the /D option
- can not be recovered. If the CLEAN-UP program is available,
- it can be used to disinfect the file. Partition table and boot
- sector viruses can not be removed by the /D option and require
- the CLEAN-UP virus removal program.
-
- /E .xxx .yyy - This option allows an additional extension or set
- extensions to be scanned. Extensions should include a period "."
- character and be separated by a space after the /E. Up to three
- extensions may be added with the /E. For more extensions, use
- the /A option instead.
-
-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 9
-
-
- /EXT {filename} - This option tells OS2NSCAN to search for viruses
- using virus search strings from ASCII text file {filename}, in
- addition to the viruses that OS2NSCAN looks for. For instructions
- creating an external virus data file, refer to Appendix A.
-
- NOTE: The /EXT option provides users with the ability to add
- strings for detection of viruses on an interim or
- emergency basis. When used with the /D option, it will
- overwrite-and-delete infected files. This option is not
- for general use and should be used with caution.
-
- /FAST - This option speeds OS2NSCAN up by displaying less on the
- the screen, skipping checking inside of LZEXE- and PKLITE-
- compressed files (DOS only), and examining a smaller portion of
- files during scanning. This may reduce the accuracy of OS2NSCAN.
-
- /HISTORY {filename} - This option saves the output of OS2NSCAN
- to {filename} in ASCII text file format. If {filename} exists,
- OS2NSCAN will add the results of the current scan to the end.
-
- /NLZ - This option tells OS2NSCAN not to look inside files
- compressed with LZEXE, a file compression program for DOS
- .EXE files. OS2NSCAN will still check LZEXE-compressed files for
- viruses that may have become infected after LZEXE compression.
-
- /NOBREAK - This option prevents Ctrl-C or Ctrl-Brk from aborting
- the scanning process.
-
- /NOEXPIRE - This option prevents OS2NSCAN from displaying a
- warning message after 7 months warning that it may no longer be
- current with respect to known computer viruses.
-
- /NOPAUSE - This option disables the "More? (H = Help )" prompt
- displayed when OS2NSCAN fills up a screen with 24 lines of text.
- This allows OS2NSCAN to run on PC's with severe infections without
- requiring operator assistance.
-
- /NPKL - This option tells OS2NSCAN not to look inside files
- compressed with PKLITE, a file compression program for DOS .EXE
- files. OS2NSCAN will still check PKLITE-compressed files for
- viruses that may have become infected after PKLITE compression.
-
- /REPORT {filename} - This option saves the output of OS2NSCAN
- to {filename} in ASCII text file format. If {filename} exists,
- OS2NSCAN will erase it and replace with the current scan results.
-
- /RF {filename} - This option removes recovery and validation
- data from log file {filename} created by the /AF option.
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 10
-
-
- /SAVE - This option stores any listed options for subsequent
- executions of OS2NSCAN. The options are stored by creating a
- file named NETSCAN.INI in the same directory as OS2NSCAN.EXE.
- For example, the command:
-
- OS2NSCAN /NOMEM /REPORT C:\OS2NSCAN.LOG /NOPAUSE /SAVE
-
- saves the default options to /NOMEM, /REPORT C:\OS2NSCAN.LOG and
- /NOPAUSE and will cause OS2NSCAN to use these options the next
- time it is run. If OS2NSCAN is run with only the /SAVE switch,
- the OS2NSCAN.INI file is removed. If you wish to use more than
- one set of switches with OS2NSCAN, use the @{filename} option
- instead.
-
- /SUB - This option scans all subdirectories inside a
- subdirectory. The /SUB switch is not required if you are
- scanning a drive from the root level.
-
- @{filename} - This option allows the user to run OS2NSCAN with
- a configuration file listing the options and drives OS2NSCAN is
- to check. Options need to be separated by a space, while drives
- (disks, subdirectories, or files) need to be listed on separate
- lines. A sample file might look like this:
-
- /A /BELL /CF C:\OS2SCAN\CF-FILE /REPORT C:\OS2SCAN\OS2NSCAN.LOG
- F:
-
- The first line contains the OS2NSCAN options while other lines
- list the names of disks, subdirectories, or files to scan. The
- file should be an ASCII text file.
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 11
-
-
- EXAMPLES
-
- The following examples show different option settings:
-
- OS2NSCAN F:
- To scan drive F:
-
- OS2NSCAN F:R-HOOPER.EXE
- Scans file "R-HOOPER.EXE" on drive F:
-
- OS2NSCAN F: /A /CF C:\OS2NETSCAN\OS2NETSCAN.VALFILE
- Scans all files and checks recovery data & validation
- codes for unknown viruses on drive F:
-
- OS2NSCAN G: /D /A
- Scans all files on drive G: and prompt for erasure of
- any infected files, if found.
-
- OS2NSCAN F: G: H: /AF C:\OS2NETSCAN\OS2NETSCAN.VALFILE
- Scan for viruses, add recovery data & validation codes
- to files on drives F:, G:, and H:
-
- OS2NSCAN M: N: /A
- Scan all files on drives M: and N: for viruses, and
- display all messages in French if MCAFEE.MSG is present.
-
- OS2NSCAN X: Z: /E .WPM .COD
- Scans drives X: and Z:, including .WPM and .COD files
-
- OS2NSCAN F: /EXT A:SAMPLE.ASC /BELL
- To scan drive F: for known computer viruses and also
- for viruses added by the user via the external virus
- data file option, and beep whenever a virus is found.
-
- OS2NSCAN F: /NOPAUSE /REPORT C:INFECTN.RPT
- To scan drive F: without stopping, and create a log
- file INFECTN.RPT on drive C:
-
- OS2NSCAN G:\PUBLIC\TMP /SUB
- To scan all subdirectories under the directory
- PUBLIC\TMP on drive G:
-
- OS2NSCAN X: Y: Z: /FAST /CERTIFY
- To perform a fast scan of drives X:, Y:, and Z: and
- check for any files that do not have validation codes
- added to them with VIRUSCAN FOR OS/2 (OS2SCAN.EXE)
-
- OS2NSCAN F: C:\SCANOPTN.LST
- To run OS2NSCAN against drive F: using configuration
- file SCANOPTN.LST located in the root directory of
- drive C:.
-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 12
-
-
- VIRUS REMOVAL
-
- What do you do if a virus is found? You can contact McAfee
- Associates for help, their authorized agents, or use the CLEAN-UP
- program. CLEAN-UP is available for DOS (CLEAN.EXE) and OS/2
- (OS2CLEAN.EXE).
-
- McAfee Associates can be reached by BBS, CompuServe, FAX,
- Internet, or Telephone and there is no charge for support calls
- to McAfee Associates (Authorized agents may charge normal McAfee
- Associates consulting rates.).
-
- The CLEAN-UP universal virus disinfection program can
- disinfect virtually all reported computer viruses. It is
- updated with each release of the VIRUSCAN programs to remove new
- viruses. CLEAN-UP can be downloaded from McAfee Associates'
- BBS, the McAfee Virus Help Forum on CompuServe, and the
- mcafee.COM and WSMR-SIMTEL20.Army.Mil sites on the Internet, or
- from any of the agents' BBSes listed in the enclosed AGENTS.TXT
- text file.
-
- It is strongly recommended that you get experienced help in
- dealing with viruses if you are unfamiliar with anti-virus
- software and methods. This is especially true for 'critical'
- viruses and partition table/boot sector infecting viruses as
- improper removal of these viruses can result in the loss of
- all data and the use of the infected disk(s).
-
- Before removing a boot sector or partition table-infecting
- virus, it is recommended that you cold boot the infected PC from
- a clean DOS disk and backup any critical data.
-
- For qualified assistance in removing a virus, contact
- McAfee Associates directly or any of the Authorized Agents in
- your area. Agents may charge McAfee Associates' normal consult
- rates for their services.
-
- If you wish to remove a file-infecting virus manually, cold
- boot the PC from a clean (virus-free) OS/2 boot diskette and run
- OS2NSCAN with the /A and /D switches to erase all infected files.
- Any files removed in this manner can not be recovered.
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 13
-
-
- LICENSE
-
- OS2NSCAN may be copied and distributed for testing and
- evaluation purposes on a trial period of five (5) days. If you
- wish to use OS2NSCAN after the trial period, a license is
- required. Licenses are available for internal use within
- businesses, organizations, government agencies, and for external
- use by repair centers and other service organizations. License
- fees are based on the size of the network or number of copies
- required. Information on licensing can be obtained from McAfee
- Associates or any authorized agent listed in the AGENTS.TXT
- file.
-
-
- TECH SUPPORT
-
- For fast and accurate help, please have the following
- information ready when you contact McAfee Associates:
-
- - Program name and version number.
-
- - Type and brand of computer, hard disk, plus any
- peripherals.
-
- - Version of OS/2 (use the SYSLEVEL command to display).
-
- - Printouts of your AUTOEXEC.BAT and CONFIG.SYS files.
-
- - The exact problem you are having. Please be as
- specific as possible. Having a printout of the
- screen and/or being at your computer will be helpful.
-
- McAfee Associates can be contacted by BBS, CompuServe, FAX, or
- InterNet 24 hours a day, or by telephone at (408) 988-3832,
- Monday through Friday, 7:00AM to 5:30PM Pacific Time.
-
- If you are overseas, you can contact a McAfee Associates
- Authorized Agent. Agents are located in over 50 countries
- around the world and provide local sales and support for our
- software. Please refer to the AGENTS.TXT file for a complete
- list of McAfee Associates Agents.
-
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 14
-
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- OBTAINING THE LATEST VERSION OF McAFEE ASSOCIATES PROGRAMS
-
- McAfee Associates regularly updates the VIRUSCAN series
- of programs every 4 to 6 weeks to add new virus detectors,
- new options, and fix reported bugs. To distribute these new
- versions, we run a multi-line BBS, CompuServe Forum, and
- Internet node.
-
- BBS ACCESS
-
- Our 25-line BBS is accessible 24 hours a day, 365 days a
- year, except for scheduled downtime and maintenance. All lines
- run US Robotics Courier HST Dual Standard ASL modems operating
- from 1,200bps to 14,400bps with line settings of 8 data bits, no
- parity, and one stop bit.
-
-
- THE McAFEE VIRUS HELP FORUM ON COMPUSERVE
-
- We are now sponsoring the McAfee Virus Help Forum on
- CompuServe. To reach the McAfee Virus Help Forum type GO MCAFEE
- at any CompuServe prompt. A free introductory membership is
- available. For more information, please read the enclosed
- COMPUSER.NOT file.
-
-
- INTERNET ACCESS TO McAFEE ASSOCIATES SOFTWARE
-
- The latest versions of McAfee Associates' anti-viral
- software is now available by anonymous ftp (file transfer
- protocol over the Internet from the site mcafee.COM. If
- your domain resolver does not support names, use the IP#
- 192.187.128.1. Enter "anonymous" for your user I.D. and
- your own email address for the password. Programs are
- located in the pub/antivirus directory. If you have any
- questions, please send email to support@mcafee.COM
-
- McAfee Associates' anti-viral software may also be
- found at the Simtel20 archive site WSMR-SIMTEL20.Army.MIL
- in the PD1:<MSDOS.TROJAN-PRO> directory and its associated
- mirror sites WUARCHIVE.WUSTL.EDU (US), NIC.SWITCH.CH (Swiss),
- NIC.FUNET.FI (Finland), SRC.DOC.IC.AC (UK), and
- RANA.CC.DEAK.OZ.AU (Australia).
-
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- OS2NSCAN FOR OS/2 Version 9.13V100 Page 15
-
-
- APPENDIX A: Creating a Virus String File with the /EXT Option
-
- NOTE: The /EXT option is intended for emergency and research
- use only. It is a temporary method for identifying new
- viruses prior to the subsequent release of OS2NSCAN. A
- thorough understanding of viruses and string-search
- techniques is advised for using this option. A string
- length of 10 to 15 bytes is recommended.
-
- The External Virus Data file should be created with an
- editor or a word processor and saved as an ASCII text file. Be
- sure each line ends with a Carriage Return/Line Feed pair.
-
-
- The virus string file uses the following format:
-
- #Comment about Virus_1
- "aabbccddeeff..." Virus_1_Name
- #Comment about Virus_2
- "gghhiijjkkll..." Virus_2_Name
- .
- .
- "uuvvwwxxyyzz..." Virus_n_Name
-
-
- Where aa, bb, cc, etc. are the hexadecimal bytes that you wish
- to scan for. Each line in the file represents one virus. The
- Virus Name for each virus is mandatory, and may be up to 25
- characters in length. The double quotes (") are required at the
- beginning and end of each hexadecimal string.
- OS2NSCAN will use the string file to search the Master Boot
- Record (partition table), Boot Sector, System files, all .COM
- and .EXE files, and overlay files with the extension .APP, .BIN,
- .COM, .EXE, .OV?, .PGM, .PIF, .PRG, .SWP, .SYS, and .XTP.
- Virus strings may contain wild cards. The two wildcard
- options are:
-
- FIXED POSITION WILDCARD
- The question mark "?" may be used to represent a wildcard
- in a fixed position within the string. For example, the string:
-
- "E9 7C 00 10 ? 37 CB"
-
- would match "E9 7C 00 10 27 37 CB", "E9 7C 00 10 9C 37 CB", or
- any other similar string, regardless of the fifth byte.
-
-
-
-
-
-
-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 16
-
-
- RANGE WILDCARD
-
- The asterisk "*", followed by range number in parentheses
- "(" and ")" is used to represent a variable number of adjoining
- random bytes. For example, the string:
-
- "E9 7C *(4) 37 CB"
-
- would match "E9 7C 00 37 CB", "E9 7C 00 11 37 CB", and
- "E9 7C 00 11 22 37 CB". The string "E9 7C 00 11 22 33 44 37 CB"
- would not match since the distance between 7C and 37 is greater
- than four bytes. You may specify a range of up to 99 bytes.
- Up to 10 different wildcards of either kind may be used in one
- virus string.
-
-
- COMMENTS
- A pound sign "#" at the begining of a line will denote a
- comment. Use this for adding notes to the external virus data
- file. For example:
-
- #New .COM virus found in file FRITZ.EXE from
- #Schneiderland on 01-22-91
- "53 48 45 45 50" Fritz-1 [F-1]
-
- gives a description of the virus, name of the infected file,
- where and when it was found, etc.
-
-
- APPENDIX B: Miscellaneous Application Notes
-
-
- OS2NSCAN VALIDATION CODES
-
- If you have installed any new software or programs on your
- system, and are running OS2NSCAN or VSHIELD for DOS with the /CF,
- /CG, or /CV validation codes options, you will need to reinstall
- validation codes to the new files with the /AF, /AG, or /AV
- add validation codes options of OS2NSCAN. In addition, the
- SCANVAL.VAL hidden file containing validation codes for the
- partition table, boot sector, COMMAND.COM, and system files may
- have to be replaced (unhide the file with the ATTRIB command
- and then delete it).
- The quickest way to update the validation codes is to
- remove all validation codes from the hard disk and then add them
- back by running OS2NSCAN with the /RV and then the /AV options.
-
- NOTE: This applies to any new version of DOS, as well as any
- programs which you install on your system.
-
-
-
- OS2NSCAN FOR OS/2 Version 9.13V100 Page 17
-
-
- IMPORTANT NOTICE - PLEASE READ!
-
- Due to the nature of anti-virus software, the slight chance
- exists that a virus may be reported in a file that is not
- infected by that virus.
-
- If you receive a report of a virus infection which you believe
- may be in error, please contact McAfee Associates by telephone
- at (408) 988-3832, by fax at (408) 970-9727, or upload the file
- to our BBS at (408) 988-4004 along with your name, address,
- daytime telephone number, and electronic mail address, if any.
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