BAT.8Fish
Description BAT.8Fish
This is a dangerous non-memory resident parasitic BAT virus. It searches for .BAT files, then writes itself to the end of the file. On Mondays, the virus drops the "Whale" DOS virus.
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OhOh.799
Description OhOh.799
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed. The virus does not work with system memory blocks correctly and may halt the system. It uses anti-debugging tricks and contains the text strings:
I LOVE YOU !
Oh Oh ! I AM VIRUS!
Oksana.1735
Description Oksana.1735
This is a very dangerous nonmemory resident parasitic encrypted virus. The virus searches for COM files then writes itself to the end of the file. The virus do not infects the COMMAND.COM file, but the string comparing utility has a bug, and the virus do not infect C*.COM files. If the virus detects a file that has COM extension and EXE internal format, the virus overwrites that file with a program that displays the message in Russian. Some viruses of that family disinfect the host file before return.
On October 21 the viruses display the message:
HAPPY BIRTHDAY OKSANA
Depending on the generation or counters the virus reads into the system memory and then erases the FAT of the C: drive and displays the message in Russian. Then the virus wait for 3:00am and restores the FAT.
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