Nimda.e, W32/Nimda@mm, I-Worm.Nimda


Nimda.E is a recompiled variant of Nimda.A virus-worm. It is not compressed. It uses the same techniques as Nimda.A, except it spreads itself with SAMPLE.EXE file name.

Other minor differences are as follows:

1. The worm uses COOL.DLL name to upload itself to webservers

2. The worm uses HTTPODBC.DLL name to start from on servers

3. The worm uses CSRSS.EXE name to copy itself to servers

This version of Nimda has few serious bugs that allow it to infect files several times and to jam NT systems considerably.

Apparently the author of Nimda was offended because his virus wasn't named "Concept Virus" like he wanted. The virus code contains a copyright text string which is never displayed, saying "Concept Virus(CV) V.6, Copyright(C)2001, (This's CV, No Nimda.)"


Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

The actual lifecycle of Nimda can be split to four parts:

1) Infecting files, 2) Mass mailing, 3) Web worm and 4) LAN propagation.

F-Secure Anti-Virus detects this variant with updates released on October 29, 2001 / 18:32:39 (GMT+2).

A tool to disinfect all Nimda variants including Nimda.E is available here:



On October 30th, F-Secure received reports of live infections in Germany and Sweden. On October 31st, we received further reports from USA, China, France, Norway, Finland and Spain.

For more information on Nimda.A please read the description:



[F-Secure Corp.; October 30th, 2001]

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