Worm:W32/NetSky.AD

Classification

Malware

Email-Worm

W32

NetSky.AD, W32/NetSky.AD@mm

Summary

Despite the arrest of the Netsky's worm author, new worm variants keep coming. On May 21st 2004 we received a sample of a new Netsky worm variant. Even more interesting is the fact that the new Netsky drops a Bugbear's worm keylogger to an infected system. This Netsky variant is based on Netsky.D worm variant, that was found on March 1st, 2004.

Removal

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.

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

Find out more

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User Guide

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Submit a sample

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Technical Details

Descriptions of NetSky.D worm variant can be found here: NetSky.D.

Descriptions of Bugbear worm keylogger can be found here: Tanatos

The worm's file is a PE executable file 40448 bytes long packed with a modified UPX file compressor. The Bugbear's keylogger is a PE DLL file 5632 bytes long. The keylogger is dropped to Windows System folder with a random name and it creates 2 more DLL files with random names there. These files are used to store keylogger data in encrypted form.