Threat Description

Sasser.E

Details

Aliases: Sasser.E, W32/Sasser.E, LSASSS
Category: Malware
Type:
Platform: W32

Summary



Sasser.E is an Internet worm spreading through the MS04-011 (LSASS) vulnerability.Sasser.E is a variant of Sasser.D.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

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 "lsasss.exe" process, then delete the file 'lsasss.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



It has been modified by changing the main virus file name to LSASSS.EXE. Note that this has nothing to do with Windows' LSASS.EXE. Also the port numbers used for the shell and FTP server have been changed.

Also, Sasser.E tries to remove the Bagle worm, unlike earlier Sassers but just like many Netsky variants.

Two hours after infection Sasser.E displays the following message:

For more details on Sasser, see description of Sasser.D.






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