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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Lirva.B

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Lirva.B
Technical name:W32/Lirva.B
Threat level:Low
Type:Worm
Effects:  

It ends processes belonging to antivirus programs. It launches the browser Internet Explorer and connects to an specific web site on the 7th and 24th of every month.

Affected platforms:

Windows XP/2000/NT/ME/98/95

First detected on:Jan. 9, 2003
Detection updated on:March 16, 2005
StatisticsNo

Brief Description 

    

Lirva.B is a dangerous worm that launches the browser Internet Explorer and connects to the web site http://www.avril-lavigne.com on the 7th and 24th of each month.

In addition, Lirva.B ends several processes belonging to antivirus programs, among others.

Lirva.B spreads via e-mail in a message with variable characteristics and an attached file with an EXE extension.

It is very easy to become affected by Lirva.B as it is automatically activated when the message carrying the worm is viewed through Outlook's Preview Pane. It does this by exploiting a vulnerability in Internet Explorer (versions 5.01 and 5.5), which allows files attached to e-mail messages to be automatically run.

Visible Symptoms 

    

Lirva.B is very easy to recognize, as it launches the browser Internet Explorer and connects to the web site http://www.avril-lavigne.com on the 7th and 24th of every month.
From then on, the mouse cursor will start moving automatically, which makes it difficult to use.