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.

Eliminating a Local Network Outbreak

If the infection is in a local network, please follow the instructions on this webpage:

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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.

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