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NCSA Virus Report #13
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? VIRUS REPORT ?
? 3551 Virus ?
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Synonyms: Syslock, 3555
Host Machine: PC compatibles.
Host Files: Encrypting, non-resident. Infects COM, EXE files.
Increase in Size of Infected Files: 3551-3555 bytes.
Nature of Damage: Corrupts COM and EXE files. May corrupt data files.
Detected by: Scanv56+, F-Prot, Pro-Scan.
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 © 1990 NCSA. ?
? ?
? This document may be distributed in any format, providing ?
? this message is not removed or altered. ?
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