Threat Description

Sasser.C

Details

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

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 scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.

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: https://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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