84 lines
4.1 KiB
Plaintext
84 lines
4.1 KiB
Plaintext
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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³ VIRUS REPORT ³
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³ Vacsina ³
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ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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Date of Origin: August, 1989.
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Place of Origin: Sophia, Bulgaria.
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Host Machine: PC compatibles.
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Host Files: Remains resident. Infects COM, EXE, SYS, and BIN files.
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OnScreen Symptoms: An infected file may beep when executed.
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Increase in Size of Infected Files: 1206 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: Scanv56+, F-Prot.
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Removed by: CleanUp, Scan/D/A, F-Prot, or delete infected files.
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Synonym: TP04VIR virus.
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Developed in Sophia, Bulgaria, and possibly first reported by
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reported by Chris Fischer in Germany in August, 1989. Vacsina takes over
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interrupt 21 and connects to COM and EXE files. Vacsina works on
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PC/MS-DOS ver. 2.0 or higher. It infects COM files increasing them by
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1206 to 1221 bytes (placing the virus code on a paragraph start). It
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infects EXE files in two passes: After the first pass the EXE file is 132
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bytes longer; after the second pass its size increases by an aditional
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1206 to 1221 bytes. The virus installs a TSR in memory wich will infect
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executable files upon loading them (INT 21 subfunction 4B00) using 8208
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bytes of memory.
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The only "function" found so far is an audible alarm or beep(BELL
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character) whenever another file is successfully infected. This suggests
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that this virus is a "draft", and more is to come.
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Vacsina infects COM files that are bigger than 04B6h bytes and
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smaller than F593h bytes and start with a JMP (E9h). Vacsina infects EXE
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files if they are smaller than FDB3 bytes (no lower limit).
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The virus is named<Note: by Torsten Boerstler, Christoph Fischer and
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Rainer Stober of the Micro-BIT Virus Team, University of Karlsruhe, West
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Germany.> "vacsina" because it opens a file named VACSINA. It doesn't
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check the return status of the open call, and never touches the file
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until the end of the virus code, where it closes the file (again ignoring
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the return code). It is believed that vacsina is a prematurely-escaped
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virus (or code built to detect viruses), and that the virus programmer
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will add some code in a later version of the virus.
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To detect the original virus, search for the word VACSINA (all
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capitals).
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ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
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º This document was adapted from the book "Computer Viruses", º
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º which is copyright and distributed by the National Computer º
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º Security Association. It contains information compiled from º
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º many sources. To the best of our knowledge, all information º
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º presented here is accurate. º
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º º
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º Please send any updates or corrections to the NCSA, Suite 309, º
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º 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS º
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º and upload the information: (202) 364-1304. Or call us voice at º
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º (202) 364-8252. This version was produced May 22, 1990. º
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º º
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º The NCSA is a non-profit organization dedicated to improving º
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º computer security. Membership in the association is just $45 per º
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º year. Copies of the book "Computer Viruses", which provides º
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º detailed information on over 145 viruses, can be obtained from º
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º the NCSA. Member price: $44; non-member price: $55. º
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º º
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º The document is copyright (c) 1990 NCSA. º
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º º
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º This document may be distributed in any format, providing º
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º this message is not removed or altered. º
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ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
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