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  3. VBS.Lisa.A@mm


Risk Level 1: Very Low

February 25, 2003
February 13, 2007 11:43:34 AM
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

VBS.Lisa.A@mm is a mass-mailing worm that is written in the Visual Basic Scripting (VBS) language. This worm attempts to spread through Microsoft Outlook, mIRC, and KaZaA. The email arrives with a subject of "Click YES and vote against war!". There is no mail attachment as the worm is distributed as script in the body of the email.

VBS.Lisa.A@mm may create up to 5,000 folders on the C drive and may delete critical system files. On Windows 95/98/Me computers, the worm may format the C drive.

NOTE: Virus definitions dated prior to February 26, 2003 may detect this as Bloodhound.VBS.Worm.

Antivirus Protection Dates

  • Initial Rapid Release version February 26, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version February 26, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date February 26, 2003
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: Moderate


  • Damage Level: High


  • Distribution Level: High
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: Jason Pan

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