W32.Opasa@mm

W32.Opasa@mm is a mass-mailing worm that:

• Sends itself to the email addresses that it finds on an infected computer
• Terminates processes and services, including various security programs
• Attempts to connect to various IRC servers to wait for additional commands from an attacker.

The email contains a .zip attachment, and the Subject line varies.

Protection

• Initial Rapid Release version April 20, 2004
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version April 20, 2004
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date April 20, 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: 3 - 9
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: High