Local Security Authority Subsystem Service
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Local Security Authority Subsystem Service (LSASS), is a process in Microsoft Windows operating systems that is responsible for enforcing the security policy on the system. It verifies users logging on to a Windows computer or server, handles password changes, and creates access tokens. It also writes to the Windows Security Log.
Forcible termination of lsass.exe will result in the Welcome screen losing its accounts, prompting a restart of the machine.
Because lsass.exe is a crucial system file, its name is often faked by malware. The lsass.exe file used by Windows is located in the folder C:\Windows\System32. If it is running from any other location, that lsass.exe is most likely a virus, spyware, trojan or worm.
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