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W32.HLLW.Gaobot.CA 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.CA is compressed with UPX.

Wild

• Wild Level: Low
• Number of Infections: 0 – 49
• Number of Sites: 3 – 9
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium