W32.Gaobot.WO

W32.Gaobot.WO is a variant of W32.Gaobot.gen. It attempts to spread through network shares that have weak passwords. It also allows attackers to access an infected computer through a predetermined 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.WO is packed with FSG.

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Note: Virus definitions version 60404al (extended version 4/4/2004 rev. 38) detect this threat as W32.HLLW.Gaobot.gen.

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Protection

• Initial Rapid Release version April 7, 2004
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version April 7, 2004
• Latest Daily Certified version August 20, 2008 revision 016
• Initial Weekly Certified release date April 7, 2004

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Medium
• Number of Infections: 50 - 999
• Number of Sites: More than 10
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium