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Virus.DOS.Leprosy.Skism is a dangerous encrypted overwriting virus on DOS.

There are 3 variants:

  • Virus.DOS.Leprosy.Skism.554
  • Virus.DOS.Leprosy.Skism.1992
  • Virus.DOS.Leprosy.Skism.x

Behavior

When the virus is run, it overwrites a DOS executable file by random, but not every time, it might have to run a number of times in order to infect one file.

Files infected by the virus will no longer function properly but spreading the virus.

Advanced details

These virus do not stay memory resident after execution.

MD5 hashes:

Variant Hash
Leprosy.Skism.554 1b8ad0ab97f9bac88919e22a14d469f7
Leprosy.Skism.1992 efbe9a26379295d6740f261a4a84939c
Leprosy.Skism.x e09958a94fc88825aeecdd07f3b5aede

Payload

Skism.554 and Skism.x

These variants do not manifest themselves.

Skism.1992

When an infected program is run on Friday 25th of any month, the virus displays an ASCII picture with these messages:

The man who brought you 622, Skism One, Caption Trips, and Sub-Zero now shanks you again,  with his latest...

Skism 1992 - Virus!!!!
Get a late pass!

After that it hangs the system.

If COMMAND.COM has been infected by the virus, every time the system boots up on this day would result on displaying this screen.

References

  1. List of variants of the Leprosy.Skism virus on VX Heaven

See also

Videos

Virus.DOS.Leprosy.Skism

Virus.DOS.Leprosy.Skism.1992

Virus.DOS.Leprosy.Skism.1992

Virus.DOS

Virus.DOS.Skism

Skism virus review by danooct1

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