W32.HLLW.Gaobot.AN

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

The worm takes advantage of multiple vulnerabilities including:

• The DCOM RPC vulnerability (described in Microsoft Security Bulletin MS03-026) using TCP port 135. Using this exploit, the worm specifically targets Windows XP computers.
• The RPC locator vulnerability (described in Microsoft Security Bulletin MS03-001) using TCP port 445.
  
  W32.HLLW.Gaobot.AN is compressed with UPX.

Protection

• Initial Rapid Release version September 30, 2003
• Latest Rapid Release version September 26, 2007 revision 004
• Initial Daily Certified version September 30, 2003
• Latest Daily Certified version October 10, 2007 revision 003
• Initial Weekly Certified release date October 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: Low

Distribution

• Distribution Level: Low