Risk Level 1: Very Low

July 15, 1996
February 13, 2007 11:52:15 AM
Also Known As:

KLF hooks INT 21 in memory and infects .com files when they are run. Infected files are 356 bytes larger than uninfected files.

Antivirus Protection Dates

  • Initial Rapid Release version July 15, 1996
  • Latest Rapid Release version July 15, 1996
  • Initial Daily Certified version July 15, 1996
  • Latest Daily Certified version July 15, 1996
  • 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
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Jimmy Shah

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