W32.HLLW.Gaobot.DK

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:

• Weak passwords on network shares
• The DCOM RPC vulnerability (described in Microsoft Security Bulletin MS03-026), using TCP ports 135 and 445
• The WebDav vulnerability (described in Microsoft Security Bulletin MS03-007), using TCP port 80

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.

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

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Protection

• Initial Rapid Release version December 8, 2003
• Latest Rapid Release version July 19, 2008 revision 019
• Initial Daily Certified version December 8, 2003
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date December 10, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium