W32.Lecna.A

W32.Lecna.A is a worm that spreads by exploiting the Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011). The worm opens a back door, downloads remote files, and uses a rootkit to hide its presence on the compromised computer.

Protection

• Initial Rapid Release version May 31, 2006
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version May 31, 2006
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date May 31, 2006

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: Easy

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium