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Leprosy is a family of dangerous encrypted overwriting DOS virus. It is first discovered in the United States on August 1st, 1990.

There are 141 variants in this family, the smallest infection size is 81 bytes while that of the largest is 47,857 bytes (46.7KB).


When this virus is ran, it overwrites all the executables by overwriting the beginning of the files, making them no longer function properly.

The virus does not check the size of a file to be infected, if the file is smaller than the virus itself, the new size of it will become the size of the virus.

If COMMAND.COM has been infected, the system would be unable to recognize it after reset.


Not every variant may contain a payload, but for most of the variants, when an infected program is run on Friday 25th, the virus may activate.


The complete list of variants in this family:

  • Virus.DOS.Leprosy.81
  • Virus.DOS.Leprosy.146
  • Virus.DOS.Leprosy.321
  • Virus.DOS.Leprosy.350
  • Virus.DOS.Leprosy.370
  • Virus.DOS.Leprosy.377
  • Virus.DOS.Leprosy.554
  • Virus.DOS.Leprosy.555
  • Virus.DOS.Leprosy.562
  • Virus.DOS.Leprosy.585
  • Virus.DOS.Leprosy.595
  • Virus.DOS.Leprosy.600
  • Virus.DOS.Leprosy.615
  • Virus.DOS.Leprosy.625 (plus B)
  • Virus.DOS.Leprosy.647
  • Virus.DOS.Leprosy.666 (26 variants; A to X, Night and Tapeworm)
  • Virus.DOS.Leprosy.736
  • Virus.DOS.Leprosy.797
  • Virus.DOS.Leprosy.800
  • Virus.DOS.Leprosy.808 (A, B, M and N)
  • Virus.DOS.Leprosy.814
  • Virus.DOS.Leprosy.907
  • Virus.DOS.Leprosy.946
  • Virus.DOS.Leprosy.1207
  • Virus.DOS.Leprosy.1580 (The Hell Raiser variant)
  • Virus.DOS.Leprosy.1818
  • Virus.DOS.Leprosy.1992 (A and B)
  • Virus.DOS.Leprosy.5120
  • Virus.DOS.Leprosy.5370 (A and B)
  • Virus.DOS.Leprosy.5600
  • Virus.DOS.Leprosy.47857 (A and B)
  • Virus.DOS.Leprosy.Acid.792
  • Virus.DOS.Leprosy.BadBrains (2 variants)
  • Virus.DOS.Leprosy.BadCommand.281
  • Virus.DOS.Leprosy.Beavis.201
  • Virus.DOS.Leprosy.Busted (3 variants)
  • Virus.DOS.Leprosy.Echo.425 (plus B)
  • Virus.DOS.Leprosy.Error.625 (plus B)
  • Virus.DOS.Leprosy.Flood.999
  • Virus.DOS.Leprosy.H-Greed.666 (A, B, C and J)
  • Virus.DOS.Leprosy.HTTM.651
  • Virus.DOS.Leprosy.Jas.792
  • Virus.DOS.Leprosy.Jobo (2 variants)
  • Virus.DOS.Leprosy.Kansas.648
  • Virus.DOS.Leprosy.Lubec.731
  • Virus.DOS.Leprosy.Merci.308
  • Virus.DOS.Leprosy.Misery.664
  • Virus.DOS.Leprosy.Morrison.870
  • Virus.DOS.Leprosy.Oss.591
  • Virus.DOS.Leprosy.Peace.777 (plus B and C)
  • Virus.DOS.Leprosy.Peppy.2209
  • Virus.DOS.Leprosy.Popov.777
  • Virus.DOS.Leprosy.Riot (7 variants)
  • Virus.DOS.Leprosy.Sandra (6 variants)
  • Virus.DOS.Leprosy.Sandra_II (2 variants)
  • Virus.DOS.Leprosy.Sector (2 variants)
  • Virus.DOS.Leprosy.Seneca (8 variants)
  • Virus.DOS.Leprosy.Skism (3 variants)
  • Virus.DOS.Leprosy.Spam.1396
  • Virus.DOS.Leprosy.Taz (8 variants)
  • Virus.DOS.Leprosy.TheThing (2 variants)
  • Virus.DOS.Leprosy.Ultra.1306
  • Virus.DOS.Leprosy.Vic.1000
  • Virus.DOS.Leprosy.Violator (A and B)
  • Virus.DOS.Leprosy.YH.880


Description of the Leprosy virus, Online VSUM

Collection of the Leprosy virus, VX heaven

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