LSASS.EXE: Local security authentication server
From: Microsoft, Windows Base
Info: "lsass.exe" is the Local Security Authentication Server. It verifies the validity of user logons to your PC/Server. It generates the process responsible for authenticating users for the Winlogon service. This process is performed by using authentication packages such as the default Msgina.dll. If authentication is successful, Lsass generates the user's access token, which is used to launch the initial shell. Other processes that the user initiates inherit this token.
Note: The lsass.exe file is located in the c:\windows\System32 folder. In other cases, lsass.exe is a virus, spyware, trojan or worm!
Virus with same name:
W32.Nimos.Worm - Symantec Corporation
W32.Sasser.E.Worm (Lsasss.exe) - McAfee
W32.HLLW.Lovgate.C@mm - Symantec Corporation
A fully updated Windows, and virus checker should catch this. I'd deny it access. If Windows throws up, restore access.