Adrenalin.571
Description Adrenalin.571
It is a dangerous nonmemory resident parasitic virus. It searches for .COM files, then writes itself to the end of the file. The virus leaves the part of code in the system memory, hooks INT 21h, intercepts FindFirst/Next DOS calls, and returns "decreased" lengths of the infected files. In some cases the virus overwrites the files with trojan program. While executing that program erases CMOS and displays the message:
ADRENALIN OVERDOSE error. System dead.
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Rider.577
Description Rider.577
It is a dangerous nonmemory resident parasitic encrypted virus. It searches for COM files and writes itself to the end of the file. It deletes the files:
C:COMMAND.COM
C:DOSCOMMAND.COM
C:IO.SYS
C:MSDOS.SYS
It contains the text strings:
The iNFiLtRAtOR Virus by The Dark Rider from Norway-93
*.COM
RiftVilly family
Description RiftVilly family
These are harmless memory resident parasitic viruses. They hook INT 21h, and write themselves to the end of COM files. "RiftVilly.469" intercepts file access to DOS functions and infects COM files that are executed, opened or renamed; "RiftVilly.490" does the same with EXE files. "RiftVilly.480" intercepts a ChangeDir DOS function, and upon such calls, searches for .COM files in the current directory and infects them.
The viruses contain the following text strings:
"RiftVilly.469": Rift Villy v.3.4
"RiftVilly.480": Rift Villy v.3.1
"RiftVilly.490": Rift Villy v.4.0
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