W32.HLLW.Gaobot.BT

W32.HLLW.Gaobot.BT is a variant of W32.HLLW.Gaobot.AE that attempts to spread to network shares that have weak passwords, and allows access to an infected computer through an IRC channel. The worm also attempts to terminate the processes of various antivirus and firewall programs.

The worm uses multiple vulnerabilities to spread, including:

• The DCOM RPC vulnerability (described in Microsoft Security Bulletin MS03-026) using TCP port 135
• The RPC locator vulnerability (described in Microsoft Security Bulletin MS03-001) using TCP port 445
• The WebDav vulnerability (described in Microsoft Security Bulletin MS03-007) using TCP port 80
  

W32.HLLW.Gaobot.BT is packed with ExeStealth and ASPack.

Protection

• Initial Rapid Release version October 31, 2003
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version October 31, 2003
• Latest Daily Certified version August 20, 2008 revision 016
• Initial Weekly Certified release date October 31, 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: Easy

Damage

• Damage Level: Low

Distribution

• Distribution Level: Low