Virus.DOS.Zver or Zver is a virus that runs on MS-DOS.
This virus has 2 versions:
Zver is a memory resident parasitic virus.
It hooks INT 21h and writes itself to the beginning of .COM files that are executed or opened. While infecting the virus uses the method of the "Beast " virus. The virus contains the internal text word in Russian (that word means "beast"):
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