W32.Nimda.E@mm

W32.Nimda.E@mm is a new version of W32.Nimda.A@mm that contains bug fixes and other modifications, which are designed to prevent antivirus programs from detecting this variant.





For additional information, read the Microsoft TechNet article, "Information on the "Nimda" Worm."


For information on .enc detections, read the article, "What is an .enc detection?"

Antivirus Protection Dates

• Initial Rapid Release version October 29, 2001
• Latest Rapid Release version July 18, 2010 revision 021
• Initial Daily Certified version October 29, 2001
• Latest Daily Certified version July 19, 2010 revision 002
• Initial Weekly Certified release date October 29, 2001

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

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: More than 1000
• Number of Sites: More than 10
• Geographical Distribution: High
• Threat Containment: Moderate
• Removal: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: High