Due to a decreased rate of submissions, Symantec Security Response has downgraded this threat from a Category 3 to a Category 2 as of February 28, 2003.
W32.Lirva.A is a mass-mailing worm that also spreads by IRC, ICQ, KaZaA, and open network shares. This worm attempts to terminate antivirus and firewall products. It also emails the cached Windows 95/98/Me dial-up networking passwords to the virus writer.
When Microsoft Outlook receives the worm, the worm takes advantage of a vulnerability that allows the attachment to auto-execute when you read or preview the email. Information on this vulnerability and a patch can be found at http://www.microsoft.com/technet/security/bulletin/MS01-020.asp.
If the day of the month is the 7th, 11th, or 24th, the worm will launch your Web browser to www.avril-lavigne.com and display a graphic animation on the Windows desktop.
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