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Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.


Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Bagle.Q
Technical name:W32/Bagle.Q.worm
Threat level:Medium

It infects PE files, downloads a file from the Internet and ends processes belonging to security applications.

Affected platforms:

Windows 2003/XP/2000/NT/ME/98/95

Detection updated on:April 15, 2004
Proactive protection:
Yes, using TruPrevent Technologies
Repair utility:Panda QuickRemover

Brief Description 


Bagle.Q is a virus that has worm characteristics. Bagle.Q infects PE files, increasing their size by 26 KBytes.

Bagle.Q spreads via e-mail in a message with variable characteristics and through peer-to-peer (P2P) file sharing programs.

Bagle.Q attempts to connect to several IP addresses, in order to download and run a file on the affected computer.

In addition, Bagle.Q ends processes belonging to several antivirus programs, firewalls and system monitoring tools. It also ends the processes belonging to previous variants of the worms Bagle and Netsky.

Visible Symptoms 


Bagle.Q is difficult to recognize, as it does not show any messages or warnings that indicate it has reached the computer.