Threat Description

Sasser.C

Details

Aliases:Sasser.C, Worm.Win32.Sasser.c, W32/Sasser.C
Category: Malware
Type:
Platform: W32

Summary



Sasser.C is an Internet worm spreading through the MS04-011 (LSASS) vulnerability.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.

Eliminating a Local Network Outbreak

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

Manual Disinfection

To manually disinfect an infected system, first apply the Microsoft patch MS04-011, then use Task Manager to kill the "avserve2.exe" process, then delete the file AVSERVE2.EXE from your Windows directory and reboot. For step-by-step instructions, see Microsoft's site: http://www.microsoft.com/security/incident/sasser.asp#steps



Technical Details



Sasser.C is a variant of Sasser.B, with identical length. Main difference is that this version starts 1024 processes to scan for new vulnerable hosts, instead of 128 processes.

For more details, see the description of Sasser.B






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