W32.HLLW.Gaobot.BZ

W32.HLLW.Gaobot.BZ 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.BZ is compressed with ASPack and UPX.

Protection

• Initial Rapid Release version November 1, 2003
• Latest Rapid Release version November 1, 2003
• Initial Daily Certified version November 1, 2003
• Latest Daily Certified version November 1, 2003
• Initial Weekly Certified release date November 1, 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