W32.Mydoom.B@mm

W32.Mydoom.B@mm is an encrypted mass-mailing worm that arrives as an attachment with either a .exe, .scr, .cmd, .zip, or .pif extension. It also performs a denial of service attack on www.microsoft.com and allows unauthorized remote access to the compromised host.

Protection

• Initial Rapid Release version January 28, 2004
• Latest Rapid Release version February 23, 2009 revision 052
• Initial Daily Certified version January 28, 2004
• Latest Daily Certified version February 24, 2009 revision 024
• Initial Weekly Certified release date January 28, 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: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Medium
• Payload: Attempt to perform a DoS attack on various web sites.
• Large Scale E-mailing: Sends a mass mailing of itself.
• Modifies Files: Modifies the hosts file to prevent access to certain Web sites.

Distribution

• Distribution Level: High
• Subject of Email: Varies
• Name of Attachment: Varies
• Shared Drives: Copies itself to Kazaa download folder.