1. Symantec/
  2. Security Response/
  3. W32.Zotob.A


Risk Level 2: Low

August 14, 2005
February 13, 2007 12:43:22 PM
Also Known As:
CME-243, Zotob.A [F-Secure], W32/Zotob.worm [McAfee], W32/Zotob-A [Sophos], WORM_ZOTOB.A [Trend]
Systems Affected:

W32.Zotob.A is a worm that spreads by exploiting the Microsoft Windows Plug and Play Buffer Overflow Vulnerability (described in Microsoft Security Bulletin MS05-039)

  • Definitions prior to Aug 14, 2005 may detect this worm as W32.IRCBot.
  • While computers running Windows 95/98/Me/NT4/XP operating systems cannot be infected remotely, it is possible they could be infected if W32.Zotob.A is executed locally (although this is an unlikely occurrence). Vulnerable Windows 2000 computers could then be infected by the compromised computer.

August 15, 2005: Added link to removal tool.

Antivirus Protection Dates

  • Initial Rapid Release version August 14, 2005
  • Latest Rapid Release version March 3, 2008 revision 035
  • Initial Daily Certified version August 14, 2005
  • Latest Daily Certified version March 3, 2008 revision 037
  • Initial Weekly Certified release date August 14, 2005
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Robert X Wang

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