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Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.


Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Bagle.BC
Technical name:W32/Bagle.BC.worm!CME-473
Threat level:Medium

It opens the TCP port 81 and waits for remote connections. It ends processes belonging to security tools and deletes entries belonging to other worms from the Windows Registry.

Affected platforms:

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

First detected on:Oct. 29, 2004
Detection updated on:Jan. 14, 2006
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 


Bagle.BC is a worm that opens the TCP port 81 and listens to it, waiting for remote connections. By doing so, Bagle.BC allows hackers to gain remote control over the affected computer in order to carry out malicious actions that would compromise user's confidentiality or impede normal work.

Bagle.BC ends processes belonging to security tools, such as antivirus programs. This leaves the affected computer vulnerable to the attack of other malware.

In addition, Bagle.BC prevents certain worms, such as several variants of Netsky, from being executed whenever Windows is started. In order to do so, it deletes the entries belonging to these worms from the Windows Registry.

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

Visible Symptoms 


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