W32.HLLW.Gaobot.BI

W32.HLLW.Gaobot.BI is a minor variant of W32.HLLW.Gaobot.AO. It attempts to spread to network shares that have weak passwords and allows hackers to access an infected computer through an IRC channel.

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.BI is compressed with Aspack.

Protection

• Initial Rapid Release version October 28, 2003
• Latest Rapid Release version July 19, 2008 revision 019
• Initial Daily Certified version October 28, 2003
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date October 29, 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: Medium

Distribution

• Distribution Level: Medium