W32/Sasser-A is a network worm which spreads while using the Microsoft LSASS weak spot. Microsoft has made available a patch which protects against this weak spot and from Microsoft Security Bulletin MS04-011 it can be downloaded. The worm copies itself with the file name avserve.exe in the Windows folder and provides a registration key, so that it starts with the user registration.
Automatic W32.Sasser-A removal tools
Important Note: Although it is possible to manually remove W32.Sasser-A, such activity can permanently damage your system if any mistakes are made in the process, as advanced spyware parasites are able to automatically repair themselves if not completely removed. Thus, manual spyware removal is recommended for experienced users only, such as IT specialists or highly qualified system administrators. For other users, we recommend using Reimage or other tools found on 2-viruses.com.