W32.Cissi.A@mm

W32.Cissi.A@mm is a mass-mailing worm, which also contains backdoor functionality to connect to an IRC server. This worm can also wait for commands.

W32.Cissi.A@mm can spread over the network using the NetBIOS protocol. It can spread to systems that do not have passwords or to ones that have simple passwords.

The worm is written in Delphi and is packed with UPX.

Protection

• Initial Rapid Release version December 23, 2003
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version December 23, 2003
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date December 23, 2003

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: High