Virus Database

Int12

Description Int12

It is a harmless memory resident boot virus. The virus infects the boot sector of floppy disks and first boot sector of the C: drive. While infecting a boot sector the virus searches for the string "non-system disk" (any-cased) in there, and replaces the following texts with the virus installation code (40 bytes). Then the virus writes its main code to the last sector on the disk.
While loading from an infected disk the virus installation code reads the main virus code and jumps to there. Then the virus hooks INT 12h, waits for DOS loading process, then hooks INT 13h and infects the disk boot sectors that are accessed.
The virus contains the encrypted text strings:
LOVE
non-system disk

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Avv.1667

Description Avv.1667

These are not dangerous not memory resident parasitic viruses. They search for COM-files and writes themselves at their beginnings. These viruses check the files for the other viruses presence, so if the file is infected by one from the viruses "Vacsina", "Yankee", "Jerusalem", "Cascade" and several other viruses then "Avv" types the warning message. "Avv" viruses contain the internal text strings:
"Avv.1667":
Warning! In file [FILENAME] may be virus.
The AVV version 1.09, Copyright (C) 1991
AVV109: I am check 80+ viruses
Thank's Yankee Doodle for original INT 21h

"Avv.2300":
The AVV version 1.12, Copyright (C) 1992
(ARV)
*.com
AVV Warning! In file filename.ext may be virus.
AVV Warning! In system area may be virus.
AVV Warning! In system may be virus.
AVV=off
The AntiVirus Virus version 1.12
AVV112: I am check 200++ viruses
Thank's Yankee Doodle for original vectors

Avvaddon.1100

Description Avvaddon.1100

It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the beginning of EXE files that are accessed. When infected EXE files are executed, the virus disinfects them. The virus has bugs and may corrupt files while infecting them. After infecting 30 files the virus displays the message:
AVVADDON for Lozinsky:
I~m the bitch you HATED !

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