W32.Huayu

W32.Huayu is a worm that spreads by exploiting the Microsoft Windows LSASS Buffer Overrun Vulnerability, described in Microsoft Security Bulletin MS04-011. It only spreads to IP addresses between 211.159.93.0 and 211.159.93.255. This worm opens a backdoor on infected computers.

Note: Virus definitions dated prior to October 24, 2004 detect this threat as Bloodhound.Exploit.8.

Protection

• Initial Rapid Release version October 24, 2004
• Latest Rapid Release version July 26, 2008 revision 017
• Initial Daily Certified version October 24, 2004
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date October 27, 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: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium