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Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.


Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Mydoom.B
Technical name:W32/Mydoom.B.worm
Threat level:Low

It launches Distributed Denial of Service attacks against the websites and It opens a port, allowing a hacker to gain remote access to network resources.

Affected platforms:

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

First detected on:Jan. 28, 2004
Detection updated on:Dec. 13, 2005
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 


Mydoom.B is a worm that spreads via e-mail in a message with variable characteristics and through the peer-to-peer (P2P) file sharing program KaZaA.

Mydoom.B launches DDoS (Distributed Denial of Service) attacks against the websites and by launching GET/ HTTP/ 1.1 requests.

Mydoom.B drops the DLL (Dynamic Link Library) CTFMON.DLL, which creates a backdoor, opening the first available TCP port in the range from 3127 to 3198.

Visible Symptoms 


Mydoom.B is easy to recognize once it has affected the computer, as it opens the Windows Notepad and shows junk data: