lsass.exe

Extension: exe

lsass.exe is the Local Security Authority Service by Microsoft, Inc, which is responsible for security policies enforcement and handles other Windows Security Mechanisms. Lsass.exe also verifies the identification of the user when he is logging on computer and generates the process responsible for his authentication when using Winlogon service. The lsass.exe process mainly operates in the system through its ability to create access tokens.

Note that lsass.exe is legitimate file which is vital to the system and needed for the PC's normal functionality. It is located in "C:\WINDOWS\SYSTEM32\" and can't be ended using the Task Manager.

lsass.exe is a system process, it is a safe file and does not pose any threat. 

WARNING!!! 

Some parasites, for example sasser worm, use lsass.exe filename to deceive the user by hiding their processes under the name of this file. Lsass.exe filename is used by OnTarget, Pexmor, Rontokbro, Satiloler, Crutle, Wowcraft and other variants of these malware parasites. So, you may have a virus that runs the same named process and silently works in background and performs harmful actions. In order to check your PC, run a full system scan with reputable anti-malware programs. We recommend using STOPzilla and SpyHunter.

Verdict - status of the file:

diagnosis required
2-spyware.com research center gathers and checks all information related to lsass.exe. We ask ourselves the questions like: Do this file pose a threat? Does the filename is exploited by Malware? and other. The final status of the file is purely our opinion.
DIAGNOSIS REQUIRED status means that this filename is exploited by the viruses. There can be the
dangerous file with the same name as the safe file. Use the Advice below:

Advice:

If your Computer seems Sluggish, or you see some unwanted Advertisements, redirects to the strange websites, then we recommend you to scan the system with reputable anti-spyware program. Do some FREE scan tests and you will see if there are some unwanted applications, whitch might be responsible for the tab stability of the system.
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Alternate Software

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lsass.exe screenshot

lsass.exe

Removal guides in other languages

Information added: 2004-03-19 10:00
Information updated: 2012-07-11 11:54

Additional resources related to lsass.exe

Attention: If you know or you have a website or page about lsass.exe file, feel free to add a link to this list: add url

Users comments about lsass.exe:

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Guest
1. by Guest. 07/09/2005. 12:09:48
if i use internet , it will shutdown the computer in 60 second
lsass.exe, how can i fix it
0
0
Guest
if i use internet , it will shutdown the computer in 60 second
lsass.exe, how can i fix it
0
0
Guest
we have a problem about lsass, can you help me? how i remove this virus?
0
0
Guest
We have a problem in our company determining what day and time the virus entered the PC, when and how it affects the lsass.exe and what virus affects such file. Is it possible? we have until june 22, 2005, 0900 AM to know this or we will be fined. Pls help us
0
0
Guest
"system is shutting down. any unsaved changes will be lost. initiated by NT AUTHORITYSYSTEM
0
0
Guest
this file is terminate unexpedly and computer restart again and again .
please tell me what to do to resolve this problem.
thanks alot.
1
0
Guest
do I need to allow lsass to connect to the internet?
0
0
Guest
When I try downloading any file it gives me an error that my current security settings do not allow this file to be downloaded..I tried downloading the lsass.exe scanner & remover and am getting the same error..Active x control is enabled also..any one have a fix
0
0
Guest
Once the box comes up telling you your system is going to shutdown, go to run, then type in cmd.exe once a black box comes up. Type in "shutdown -a" (without quotes). And this will stop your computer from shutdown. THEN DELETE THE FILE USING lsass.exe its really not that hard. But this is a quick fix to stop the shutdown. ; )
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0
Guest
How can i get in to Windows, an dhow can i get this virus deleted ?
0
0
Guest
We have the same problem. Have you found any solutions?
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0
Guest
When I turn on my computer it does not allow me to get into windows. It says "Invalid parameter was passed to a service or function" "lsass.exe system error."

How can I fix this problem?
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0
Guest
warning! i got a trojan on my system from downloading the free worms virus scan from www.Stop-Sign.com

remove the link!
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0
Guest
Hello i need some help here, how to get rid of all the spyware that is on my computer, my homepage has been changed, cant change it back, all the process are running really slow, it gets really anoying to use my computer lately.
Please Help
Thank you
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0
Guest
System will not completely boot, message window appears "lsass.exe - System Error An invalid parameter was passed to a service or function" I have up-to-date Symantec AV and Webrot Spyware. I click OK and it tries to boot abain, never succeeding. Virus? Worm? Anyone else see this or any suggestions to repair?

Robert
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0
Guest
what can I do if I accidentaly deleted lsass.exe (while i was on the other OS installed ) . i deleted lsass.exe from XP ... now my computer boots on XP , but after the boot , it displays a black screen . what should i do ?
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0
Fenelon
digite shutdown -a na linha de comando para interromper o desligamento.

Use o arquivo Windows-KB890830-V1.2-PTB.exe para remover o virus. Este arquivo serve para o XP, 2000 e 200 server.
0
0
yusuf
sir,
I am having problem with my member server its not starting the services of wins and rpc but anyhow i trace the problem and i found the problem in regedit with rpcss service when i change the value of key from 2 to 4 its start wins and rpc but its shows server srivices starting,,but acutally its does not start now any can please help me on the same
0
0
Khushi
I have 3 lsass.exe in

C:WindowsSystem32
C:WindowsServicePackFilesI386
LSASS.exe in C:I386

Is that safe? Or only one in C:WindowsSystem32 is needed .......? Thanks
0
0
hola soy gabriela y tengo ese grave problema con mi maquina el de este virus me dieron unas heramientas para eliminarlo y no me funcionan ayudenme porfavor es urgente
More comments...

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