Threat Descriptons



Category :


Type :


Aliases :

Net-Worm:W32/Nimda.C, Net-Worm.Win32.Nimda.c, W32/Nimda.c@mm


Net-Worm:W32/Nimda.C is a UPX-compressed variant of Net-Worm:W32/Nimda.A.


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.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Net-Worm:W32/Nimda.C uses the same techniques as Nimda.A to spread itself.


F-Secure Anti-Virus detects this variant with updates released on October 11, 2001 / 16:26:32 GMT. At that time F-Secure had yet to receive any report of affected users.

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