W32.Mytob.B@mm

W32.Mytob.B@mm is a mass-mailing worm that uses it own SMTP engine to send an email to addresses that it gathers from the Windows Address Book on the compromised computer.
The worm also has the ability to open a back door and spread through the network by exploiting the Microsoft Windows Local Security Authority Service Remote Buffer Overflow (described in Microsoft Security Bulletin MS04-011).

Protection

• Initial Rapid Release version February 28, 2005
• Latest Rapid Release version December 10, 2009 revision 037
• Initial Daily Certified version February 28, 2005
• Latest Daily Certified version December 10, 2009 revision 041
• Initial Weekly Certified release date March 2, 2005

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: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: High