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{{Short description|Computer operating system component}}
{{Refimprove|date=July 2009}}
'''Local Security Authority Subsystem Service''' ('''LSASS''')<ref>{{cite web|url=https://docs.microsoft.com/en-us/windows-server/security/credentials-protection-and-management/configuring-additional-lsa-protection |title=Configuring Additional LSA Protection |publisher=Microsoft |access-date=2022-02-04}}</ref> is a [[Process (computing)|process]] in [[Microsoft Windows]] [[operating system]]s 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 token]]s.<ref>{{cite web|url=https://ss64.com/nt/syntax-services.html |title=Windows 7 Services | Windows CMD |publisher=SS64.com |access-date=2016-05-24}}</ref> It also writes to the [[Windows Security Log]].
Forcible termination of {{mono|lsass.exe}} will result in the system losing access to any account, including NT AUTHORITY, prompting a restart of the machine. Because {{mono|lsass.exe}} is a crucial system file, its name is often faked by malware. The {{mono|lsass.exe}} file used by Windows is located in the [[Directory (computing)|directory]] {{mono|%WINDIR%\System32}}, and the description of the file is '''Local Security Authority Process'''. If it is running from any other ___location, that {{mono|lsass.exe}} is most likely a [[Computer virus|virus]], [[spyware]], [[Trojan horse (computing)|trojan]] or [[Worm (computing)|worm]]. Due to the way some systems display fonts, malicious developers may name the file something like {{mono|Isass.exe}} (capital "i" instead of a lowercase "L") in efforts to trick users into installing or executing a malicious file instead of the trusted system file.<ref>{{cite web |url=http://www.errorboss.com/exe-files/lsass-exe/ |title=The Best Way To Remove Lsass.exe Virus - Fix Lsass Process |date=23 December 2014 |publisher=Errorboss.com |access-date=2016-05-24 |archive-date=2015-09-24 |archive-url=https://web.archive.org/web/20150924001856/http://www.errorboss.com/exe-files/lsass-exe/ |url-status=dead }}</ref> The [[Sasser (computer worm)|Sasser worm]] spreads by exploiting a [[buffer overflow]] in the LSASS on [[Windows XP]] and [[Windows 2000]] operating systems.▼
▲Because {{mono|lsass.exe}} is a crucial system file, its name is often faked by malware. The {{mono|lsass.exe}} file used by Windows is located in the [[Directory (computing)|directory]] {{mono|%WINDIR%\System32}}. If it is running from any other ___location, that {{mono|lsass.exe}} is most likely a [[Computer virus|virus]], [[spyware]], [[Trojan horse (computing)|trojan]] or [[Worm (computing)|worm]]. Due to the way some systems display fonts, malicious developers may name the file something like {{mono|Isass.exe}} (capital "i" instead of a lowercase "L") in efforts to trick users into installing or executing a malicious file instead of the trusted system file.<ref>{{cite web|url=http://www.errorboss.com/exe-files/lsass-exe/ |title=The Best Way To Remove Lsass.exe Virus - Fix Lsass Process |publisher=Errorboss.com |access-date=2016-05-24}}</ref>
==References==
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