Threat Description



Aliases: Sasser.G, Worm.Win32.Sasser.gen
Category: Malware
Type: Worm
Platform: W32


Sasser.G is a minor modification of the Sasser.F worm. It shares most of its code and functionality, although it uses a different filename when copying itself into the system and a different mutex name.


Automatic action

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


Detailed instructions for F-Secure security products are available in the documentation found in 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.

Technical Details

System Infection

When the worm enters the system it creates a copy of itself in the Windows Directory as 'avserve3.exe'. This copy is added to the Registry as

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]   "avserve3.exe" = "%WinDir%\avserve3.exe"   

It creates mutexes named 'PinaasoSky' and 'Jobaka3'.


Detection in F-Secure Anti-Virus was published on May 14th, 2004 in update:

Detection Type: PC
Database: 2004-05-14_01

Technical Details:Ero Carrera, August 23rd, 2004


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