Sasser.D is an Internet worm spreading through the MS04-011 (LSASS) vulnerability.
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 "skynetave.exe" process, then delete the file 'skynetave.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
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See the manual for your F-Secure product on the Help Center.
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Sasser.D is a variant of Sasser.C. This version starts 128 processes to scan for new vulnerable hosts and sends ICMP ECHO requests before attacking.
For more details, see the description of Sasser.B.