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Virus.DOS.Lichen.1024 or Lichen is a virus that runs on MS-DOS.

Payload

Lichen is not a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed. In one month after infecting the virus also hooks INT 8,9 and manifests itself by a video effect. 

Media

Virus.DOS.Lichen

Virus.DOS.Lichen.1024

Virus.DOS.Lichen.1024 on Virtual PC

Virus.DOS

Virus.DOS.Lichen

Virus.DOS.Lichen.1024