W32.HLLW.Gaobot.BC

W32.HLLW.Gaobot.BC is a variant of W32.HLLW.Gaobot.BB 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.BC is packed with Petite.



Note: Virus definitions released on October 29, 2003 contained a updated signature for W32.HLLW.Gaobot.BC due to the discovery of a minor variant.

Protection

• Initial Rapid Release version October 24, 2003
• Latest Rapid Release version October 24, 2003
• Initial Daily Certified version October 24, 2003
• Latest Daily Certified version October 24, 2003
• Initial Weekly Certified release date October 24, 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