1. Symantec/
  2. Security Response/
  3. W32.Esbot.C


Risk Level 2: Low

August 22, 2005
February 13, 2007 12:43:38 PM
Also Known As:
W32.IRCBot.Gen, Backdoor.Win32.IRCBot.ex [Kasp, W32/Sdbot.worm.gen.by [McAfee], W32/Cuebot-D [Sophos], WORM_ESBOT.D [Trend Micro]
Systems Affected:

W32.Esbot.C is a worm that spreads by exploiting the Microsoft Windows Plug and Play Buffer Overflow Vulnerability (described in Microsoft Security Bulletin MS05-039), allowing a remote attacker access to the compromised computer.

  • While computers running Windows 95/98/Me/NT4/XP operating systems cannot be infected remotely, it is possible they could be infected if the threat is executed locally (although this is an unlikely occurrence). Vulnerable Windows 2000 computers could then be infected by the compromised computer.
  • Definitions dated prior to August 23, 2005 detect this threat as W32.IRCBot.Gen.

Antivirus Protection Dates

  • Initial Rapid Release version August 23, 2005
  • Latest Rapid Release version March 3, 2008 revision 035
  • Initial Daily Certified version August 23, 2005
  • Latest Daily Certified version March 3, 2008 revision 037
  • Initial Weekly Certified release date August 24, 2005
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Jeong Mun

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