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  3. W32.Waledac.B


Risk Level 2: Low

January 1, 2011
January 3, 2011 5:53:59 AM
Also Known As:
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Vista, Windows XP
W32.Waledac.B is a worm that spreads by sending emails that contain links to copies of itself. It also sends spam, downloads other threats, and operates as part of a botnet.

Other resources
For more information, please see the following resource:

Antivirus Protection Dates

  • Initial Rapid Release version January 1, 2011 revision 016
  • Latest Rapid Release version June 10, 2013 revision 016
  • Initial Daily Certified version January 2, 2011 revision 003
  • Latest Daily Certified version June 10, 2013 revision 019
  • Initial Weekly Certified release date January 5, 2011
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 50 - 999
  • Number of Sites: 0 - 2
  • Geographical Distribution: Medium
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: High
  • Payload: Opens a back door on the compromised computer.
  • Large Scale E-mailing: May send spam email.
  • Releases Confidential Info: Attempts to steal information.


  • Distribution Level: Medium
  • Target of Infection: Spreads by sending links to copies of itself through email.
Writeup By: Cathal Mullaney

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