W32.Korgo.S

W32.Korgo.S is a variant of W32.Korgo.N. This worm attempts to propagate by exploiting the Microsoft Windows LSASS Buffer Overrun Vulnerability (described in Microsoft Security Bulletin MS04-011) on TCP port 445. It also listens on TCP port 113 and other random ports between 2000 and 8192.

Notes:

• Definitions dated prior to June 28, 2004 detect this threat as W32.Korgo.M.
• Symantec Security Response has developed a removal tool to clean the infections of W32.Korgo.S.

Protection

• Initial Rapid Release version June 22, 2004
• Latest Rapid Release version July 19, 2008 revision 019
• Initial Daily Certified version June 22, 2004
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date June 23, 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: 50 - 999
• Number of Sites: More than 10
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium