1. Symantec/
  2. Security Response/
  3. W32.HLLW.Gaobot.DK


Risk Level 2: Low

December 5, 2003
February 13, 2007 12:14:52 PM
Also Known As:
W32.HLLW.Gaobot.gen, W32/Gaobot.worm.gen [McAfee], Backdoor.Agobot.3.gen [Kaspers
Systems Affected:

W32.HLLW.Gaobot.DK is a worm that uses several exploits to spread. It acts as a spam proxy, using the infected computer to send large numbers of unsolicited emails using its own SMTP engine. This worm also opens a backdoor to a predetermined IRC channel.

This worm propagates using multiple vulnerabilities, including:

W32.HLLW.Gaobot.DK gives an attacker complete access to your computer. By default, the worm listens on TCP port 63809 and notifies the attacker through IRC. The worm attempts to terminate various security products and system-monitoring tools.

Note: Virus definitions dated prior to December 9th, 2003 may detect this threat as W32.HLLW.Gaobot.gen.

Antivirus Protection Dates

  • Initial Rapid Release version December 8, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version December 8, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date December 10, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Fergal Ladley

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