84 lines
4.1 KiB
Plaintext
84 lines
4.1 KiB
Plaintext
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
|
||
³ VIRUS REPORT ³
|
||
³ Vacsina ³
|
||
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
|
||
|
||
Date of Origin: August, 1989.
|
||
|
||
Place of Origin: Sophia, Bulgaria.
|
||
|
||
Host Machine: PC compatibles.
|
||
|
||
Host Files: Remains resident. Infects COM, EXE, SYS, and BIN files.
|
||
|
||
OnScreen Symptoms: An infected file may beep when executed.
|
||
|
||
Increase in Size of Infected Files: 1206 bytes.
|
||
|
||
Nature of Damage: Affects system run-time operation. Corrupts program or
|
||
overlay files.
|
||
|
||
Detected by: Scanv56+, F-Prot.
|
||
|
||
Removed by: CleanUp, Scan/D/A, F-Prot, or delete infected files.
|
||
|
||
Synonym: TP04VIR virus.
|
||
|
||
Developed in Sophia, Bulgaria, and possibly first reported by
|
||
reported by Chris Fischer in Germany in August, 1989. Vacsina takes over
|
||
interrupt 21 and connects to COM and EXE files. Vacsina works on
|
||
PC/MS-DOS ver. 2.0 or higher. It infects COM files increasing them by
|
||
1206 to 1221 bytes (placing the virus code on a paragraph start). It
|
||
infects EXE files in two passes: After the first pass the EXE file is 132
|
||
bytes longer; after the second pass its size increases by an aditional
|
||
1206 to 1221 bytes. The virus installs a TSR in memory wich will infect
|
||
executable files upon loading them (INT 21 subfunction 4B00) using 8208
|
||
bytes of memory.
|
||
|
||
The only "function" found so far is an audible alarm or beep(BELL
|
||
character) whenever another file is successfully infected. This suggests
|
||
that this virus is a "draft", and more is to come.
|
||
|
||
Vacsina infects COM files that are bigger than 04B6h bytes and
|
||
smaller than F593h bytes and start with a JMP (E9h). Vacsina infects EXE
|
||
files if they are smaller than FDB3 bytes (no lower limit).
|
||
|
||
The virus is named<Note: by Torsten Boerstler, Christoph Fischer and
|
||
Rainer Stober of the Micro-BIT Virus Team, University of Karlsruhe, West
|
||
Germany.> "vacsina" because it opens a file named VACSINA. It doesn't
|
||
check the return status of the open call, and never touches the file
|
||
until the end of the virus code, where it closes the file (again ignoring
|
||
the return code). It is believed that vacsina is a prematurely-escaped
|
||
virus (or code built to detect viruses), and that the virus programmer
|
||
will add some code in a later version of the virus.
|
||
|
||
To detect the original virus, search for the word VACSINA (all
|
||
capitals).
|
||
|
||
|
||
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
|
||
º This document was adapted from the book "Computer Viruses", º
|
||
º which is copyright and distributed by the National Computer º
|
||
º Security Association. It contains information compiled from º
|
||
º many sources. To the best of our knowledge, all information º
|
||
º presented here is accurate. º
|
||
º º
|
||
º Please send any updates or corrections to the NCSA, Suite 309, º
|
||
º 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS º
|
||
º and upload the information: (202) 364-1304. Or call us voice at º
|
||
º (202) 364-8252. This version was produced May 22, 1990. º
|
||
º º
|
||
º The NCSA is a non-profit organization dedicated to improving º
|
||
º computer security. Membership in the association is just $45 per º
|
||
º year. Copies of the book "Computer Viruses", which provides º
|
||
º detailed information on over 145 viruses, can be obtained from º
|
||
º the NCSA. Member price: $44; non-member price: $55. º
|
||
º º
|
||
º The document is copyright (c) 1990 NCSA. º
|
||
º º
|
||
º This document may be distributed in any format, providing º
|
||
º this message is not removed or altered. º
|
||
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
|
||
|
||
Downloaded From P-80 International Information Systems 304-744-2253
|