Virus.DOS.ZMT or ZMT is a virus that runs on MS-DOS.

It has 3 versions:

  • Virus.DOS.ZMT.252
  • Virus.DOS.ZMT.262
  • Virus.DOS.ZMT.365


ZMT is a memory resident infectors.

It copies its TSR-parts into DOS areas at address 0000:0560, hook onto INT 21h via CP/M call and hit every .COM-file currently executed. They write themselves into the beginning of the files.

Some of these viruses contain the internal text string:



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