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NCSA Virus Report #102
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? VIRUS REPORT ?
? Oropax Virus ?
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Synonyms: Music virus, Musician virus.
Date of Origin: December, 1989.
Host Machine: PC compatibles.
Host Files: Remains resident; infects COM files.
Increase in Size of Infected Files: length increases by 2756-2806 bytes,
so that total length is evenly divisible by 51. Most common length
increase is 2,773 bytes.
Nature of Damage: Affects system run-time operation; corrupts program
files.
Detected by: Scanv53+, F-Prot, IBM Scan, Pro-Scan.
Removed by: CleanUp, SCAN/D, F-Prot, or delete infected files.
A memory resident virus infecting COM files. When an infected
application is executed, the virus installs in memory trapping the DOS
21h interrupt. Thereafter, when a program attempts to create a
subdirectory, remove a subdirectory, create a file, open a file, delete
a file, get/set file attributes, rename a file, delete a file (with FCB),
create file (with FCB) or rename a file (with FCB), one COM file is
infected in the home directory. COMMAND.COM, COM files with length
divisible by 51, COM files with an attribute other than normal or
archive, or COM files with a length of 61980 bytes will not be infected.
The virus seems to activate randomly after infecting a file. If
activated, five minutes after infection it will play 3 or 6 melodies
(depending on version) repeatedly with a 7 minute interval in between
each.
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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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