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Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Encyclopedia GetVirusCard True 0


Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Bugbear
Technical name:W32/Bugbear
Threat level:Medium
Alias:Tanatos, I-Worm.Bugbear, Tanat, W32/Tanat, I-Worm.Tanatos,
Effects:  It affects several antivirus programs and firewalls.

Affected platforms:

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

First detected on:Sept. 30, 2002
Detection updated on:June 16, 2009
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 


Bugbear is a worm that reaches computers in an e-mail message which is very difficult to recognize, as its subject, contents and the name of the attached file are made up randomly.

Bugbear affects several antivirus programs and firewalls in order to leave the computer defenseless against other viruses and attacks.

Visible Symptoms 


Bugbear reaches systems in a message with variable characteristics. However, the most recurrent features are the following:

  • Subject. To see the different subjects that Bugbear uses, click here.
  • Attachments. The name of the attached file, which is variable, can include any of the following words and a double extension: CARD, DATA, DOCS, IMAGE, IMAGES, MUSIC, NEWS, PHOTO, PICS, README, RESUME, SETUP, SONG, VIDEO.