W32.Gaobot.UJ

W32.Gaobot.UJ is a variant of W32.HLLW.Gaobot.gen. It attempts to spread through network shares that have weak passwords and allows attackers 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.
• The Workstation service buffer overrun vulnerability (described in Microsoft Security Bulletin MS03-049) using TCP port 445.

W32.Gaobot.UJ is packed first with ASPack, and then with Morphine.

Protection

• Initial Rapid Release version April 1, 2004
• Latest Rapid Release version July 12, 2008 revision 018
• Initial Daily Certified version April 1, 2004
• Latest Daily Certified version July 12, 2008 revision 019
• Initial Weekly Certified release date April 1, 2004

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: Moderate
• Removal: Difficult

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium