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- ┌─────────────────────────────┐
- │ VIRUS REPORT │
- │ 3551 Virus │
- └─────────────────────────────┘
-
- Synonyms: Syslock, 3555
-
- Host Machine: PC compatibles.
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- Host Files: Encrypting, non-resident. Infects COM, EXE files.
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- Increase in Size of Infected Files: 3551-3555 bytes.
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- Nature of Damage: Corrupts COM and EXE files. May corrupt data files.
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- Detected by: Scanv56+, F-Prot, Pro-Scan.
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- Removed by: CleanUp, Scan/D, or F-Prot.
-
- Scan Code: Uses self-encryption.
-
- When an infected program is run, SysLock searchs through the COM and
- EXE files and subdirectories on the current disk, picking one executable
- file at random to infect. The infected file will have its length
- increased by about 3,551 bytes.
-
- The SysLock virus will damage files by searching for the word
- "Microsoft" in any combination of upper and lower case characters, and
- when found replace the word with either "MACROSOFT". If it finds an
- environment variable of "SYSLOCK" has been set to "@" (hex 40), the virus
- will not infect any programs or perform string replacements, but will
- instead pass control to its host immediately. The author may have used
- this during the creation of the virus.
-
- One known variant is called Macho-A. It is identical to the SysLock
- virus, except that "Microsoft" is replaced with "MACHOSOFT".
-
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- ╔════════════════════════════════════════════════════════════════════╗
- ║ This document was adapted from the book "Computer Viruses", ║
- ║ which is copyright and distributed by the National Computer ║
- ║ Security Association. It contains information compiled from ║
- ║ many sources. To the best of our knowledge, all information ║
- ║ presented here is accurate. ║
- ║ ║
- ║ Please send any updates or corrections to the NCSA, Suite 309, ║
- ║ 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS ║
- ║ and upload the information: (202) 364-1304. Or call us voice at ║
- ║ (202) 364-8252. This version was produced May 22, 1990. ║
- ║ ║
- ║ The NCSA is a non-profit organization dedicated to improving ║
- ║ computer security. Membership in the association is just $45 per ║
- ║ year. Copies of the book "Computer Viruses", which provides ║
- ║ detailed information on over 145 viruses, can be obtained from ║
- ║ the NCSA. Member price: $44; non-member price: $55. ║
- ║ ║
- ║ The document is copyright (c) 1990 NCSA. ║
- ║ ║
- ║ This document may be distributed in any format, providing ║
- ║ this message is not removed or altered. ║
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