86 lines
4.1 KiB
Plaintext
86 lines
4.1 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> Typo (COM infector) <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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Synonyms: Fumble virus, 867 virus
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Date of Origin: summer, 1989.
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Place of Origin: Israel.
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Host Machine: PC compatibles.
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Host Files: Remains resident. Infects COM files.
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Increase in Size of Infected Files: 867 bytes.
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Nature of Damage: Affects system run-time operation; corrupts program or
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overlay files.
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Detected by: Scanv48+, F-Prot, IBM Scan, Pro-Scan.
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Removed by: CleanUp, Scan/D, F-Prot, or delete infected files.
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First detected in Israel during the summer of 1989 (Some experts
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attribute first detection to Joe Hirst of Brighton, U.K., in November,
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1989.) It creates errors in printouts, by (sometimes) replacing some
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characters or digits. It is closely related to the Ping-Pong or Italian
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virus, which is one of the most common viruses. In fact, the viruses are
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so similar that some anti-virus programs even identify Typo as the
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Italian virus. This is not so surprising, since the boot sectors are
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almost identical. The differences between the boot sectors are:
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* Some local variables have been moved. For example, the word
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containing the location of the original boot sector is now located
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two bytes earlier than before.
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* The signature (two bytes that the virus uses to see if a diskette has
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already been infected) has been changed.
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* The activation times have been changed. Ping-Pong had an "activation
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window" (a second or so long) every half hour. Typo will become active
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112.5 seconds after power-on, and will stay active most of the time.
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* The major differences between the two viruses are in the other part
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of the virus code, which is not stored in the boot sector, but in the
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cluster the viruses mark as "bad" in the FAT.
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Of course, there are quite a few interesting things the viruses have
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in common. For instance, Typo contains the same "bug" as Ping-Pong does,
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that prevents it from working on '286 and '386 machines.
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It is possible to remove Typo with some programs designed to remove
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Ping-Pong. Since the signature is stored in the same place on both
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viruses, it is possible to inoculate diskettes against one of them, but
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not both.
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Typo will only infect COM files on even-numbered days.
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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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