W32.Sober.J@mm

W32.Sober.J@mm is a mass-mailing worm that uses its own SMTP engine to send itself to email addresses it gathers from the compromised computer.

The subject of the email varies and is in either English or German. The email sender address is spoofed. The name of the email attachment varies, and it has a .bat, .com, .pif, .scr, or .zip file extension. The attachment may also have a double extension.

This threat is written in the Microsoft Visual Basic programming language and is compressed with UPX.

Protection

• Initial Rapid Release version January 31, 2005
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version January 31, 2005
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date January 31, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Medium
• Number of Infections: 0 - 49
• Number of Sites: 3 - 9
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Low

Distribution

• Distribution Level: High