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Virus.DOS.AMSV.443 or AMSV (Anti-MicroSoft Virus) is a dangerous memory resident parasitic virus that runs on MS-DOS.

Payload

After the virus has been loaded into memory, it hooks INT 21h, and writes itself to the end of the DOS executables that are run.

The virus also deletes files that their filename contains the following text string:

MSAV

Other details

It contains the internal text strings:

MSAV

Eli & Yuval were here and killed the Lehigh !!!

The Anti-MicroSoft Virus (AMSV) v1.0

By Yuval Sherman & Eli Shapira.... Revenge against Microsoft.