Sasser.C is an Internet worm spreading through the MS04-011 (LSASS) vulnerability.
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.
If the infection is in a local network, please follow the instructions on this webpage:
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
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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