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  3. AntiCMOS


Risk Level 1: Very Low

July 11, 1994
February 13, 2007 11:34:07 AM
Also Known As:

AntiCMOS is a simple virus that infects master boot records (MBRs) and DOS boot sectors (DBSs). AntiCMOS spreads only when you attempt to boot a system from an infected floppy disk. There is little difference between the .A and .B strains of AntiCMOS. Other than the triggered event, they are identical.

Area of infection: Floppy boot sectors, master boot records
Likelihood: Common
Region reported: Europe, Hong Kong, U.S.A.
Characteristics: Wild, memory resident
Target platform: DOS

Antivirus Protection Dates

  • Initial Rapid Release version July 11, 1994
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version July 11, 1994
  • Latest Daily Certified version August 20, 2008 revision 016
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: Low


  • Distribution Level: Low

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