Virus Database

Slof.775

Description Slof.775

It is a harmless memory resident parasitic virus. It hooks INT 21h and writes itself to the beginning of .COM files that are executed. The virus does not manifest itself in any way. It contains the ID-text:
SLOFTXC

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AAA.807

Description AAA.807

It is a harmless nonmemory resident parasitic virus. It searches for .COM files in the current directory, then writes itself to the end of the file. The virus contains the text strings:
*.COM
- AAA AAA AAA AAA AAA AAA AAA AAA.-

AAV.8224

Description AAV.8224

It is a very dangerous memory resident parasitic virus. It hooks INT 10h, 13h, 16h, 21h and stays memory resident. When any file is executed, or on DOS GetDiskSpace call, or in its INT 10h handler, if the system is not busy, the virus searches for .COM and .EXE files and writes itself to the end of the file.
The virus pays special attention for C:COMMAND.COM file and infects it in the way similar to the "Peasant" virus - it overwrites the beginning of the COMMAND.COM with 512 bytes of virus loader and saves the original COMMAND.COM's header and the rest of the virus code to the not used sectors of the first track on the hard drive.
When infected COMMAND.COM is executed, virus loader reads the rest of the virus code from the hard drive, stays memory resident, then restores the original beginning of COMMAND.COM and returns control.
This way of infection may corrupt the data and the files. The virus may also halt the system while loading memory resident - it uses quite complex way of interrupts hooking/releasing and may corrupt DOS kernel.
Depending on the system time, date and several other conditions the virus displays the messages in Chinese and in English:
THIS FILE MAY BE INFECTED WITH VIRUS
TO KILL VIRUS,YOU CAN REINSTALL THIS FILE
IDEARS AUTO_ANTI_VIRUS SOFTWARE GROUP AAV MARK:4540055520
AUTO_ANTI_VIRUS
THIS FILE IS SAFE THANKS FOR USE AAV
IDEARS AUTO_ANTI_VIRUS SOFTWARE GROUP AAV MARK:4540055520

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