riftvilly famil
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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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