88 lines
4.7 KiB
Plaintext
88 lines
4.7 KiB
Plaintext
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ
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<20> VIRUS REPORT <20>
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<20> nVIR <20>
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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Host Machine: Macintosh.
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nVIR is a Macintosh virus that has now led to numerous strains,
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including MEV#, AIDS, nFLU, and nVIR A and B.
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When you run an application infected with nVIR A or B on a clean
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system, the infection spreads from the application to the system file.
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After rebooting, the infection in turn spreads from the system to other
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applications, as they are run. The effect can be devastating (see
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sidebar).
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At first, nVIR A and B only replicate. When the system file is first
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infected, a counter is initialized to 1000. The counter is decremented
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by 1 each time the system is booted, and it is decremented by 2 each time
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an infected application is run.
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When the counter reaches 0, nVIR A will sometimes either say "Don't
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Panic" (if MacinTalk is installed in the system folder) or beep (if
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MacinTalk is not installed in the system folder). This will happen on a
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system boot with a probability of 1/16. It will also happen when an
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infected application is launched with a probability of 31/256. In
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addition, when an infected application is launched, nVIR A may say
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"Don't Panic" twice or beep twice, with a probability of 1/256.
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When the counter reaches 0, nVIR B will sometimes beep. nVIR B does
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not call MacinTalk. The beep will happen on a system boot with a
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probability of 1/8. A single beep will happen when an infected
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application is launched with a probability of 15/64. A double beep will
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happen when an infected application is launched with a probability of
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1/64.
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It is possible for nVIR A and nVIR B to mate and sexually reproduce,
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resulting in new viruses combining parts of their parents.
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For example, if a system is infected with nVIR A, and if an
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application infected with nVIR B is run on that system, part of the nVIR
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B infection in the application is replaced by part of the nVIR A
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infection from the system. The result contains part from each of its
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parents, and behaves like nVIR A.
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Similarly, if a system is infected with nVIR B, and if an application
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infected with nVIR A is run on that system, part of the nVIR A infection
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in the application is replaced by part of the nVIR B infection from the
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system. The result is very similar to its sibling described in the
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previous paragraph, except that it has the opposite "sex" - each part is
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from the opposite parent. It behaves like nVIR B.
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These offspring are new viruses. If they are taken to a clean system
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they will infect that system, which will in turn infect other
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applications. The descendents are identical to the original offspring.
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Incestual matings of these children with each other and with their
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parents produce results that contain various combinations of parts from
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their parents.<Note: This material prepared by John Norstad, Academic
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Computing and Network Services.>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ
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<EFBFBD> This document was adapted from the book "Computer Viruses", <20>
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<EFBFBD> which is copyright and distributed by the National Computer <20>
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<EFBFBD> Security Association. It contains information compiled from <20>
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<EFBFBD> many sources. To the best of our knowledge, all information <20>
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<EFBFBD> presented here is accurate. <20>
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<EFBFBD> <20>
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<EFBFBD> Please send any updates or corrections to the NCSA, Suite 309, <20>
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<EFBFBD> 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS <20>
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<EFBFBD> and upload the information: (202) 364-1304. Or call us voice at <20>
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<EFBFBD> (202) 364-8252. This version was produced May 22, 1990. <20>
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<EFBFBD> <20>
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<EFBFBD> The NCSA is a non-profit organization dedicated to improving <20>
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<EFBFBD> computer security. Membership in the association is just $45 per <20>
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<EFBFBD> year. Copies of the book "Computer Viruses", which provides <20>
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<EFBFBD> detailed information on over 145 viruses, can be obtained from <20>
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<EFBFBD> the NCSA. Member price: $44; non-member price: $55. <20>
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<EFBFBD> <20>
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<EFBFBD> The document is copyright (c) 1990 NCSA. <20>
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<EFBFBD> <20>
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<EFBFBD> This document may be distributed in any format, providing <20>
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<EFBFBD> this message is not removed or altered. <20>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
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Downloaded From P-80 International Information Systems 304-744-2253
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