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What is lsass.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the lsass.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for lsass.exe related errors

Lsass.exe file information

Windows Task Manager with lsass
Lsass.exe process in Windows Task Manager

The process known as LSA Shell (Export Version) or Local Security Authority Process or LSA Shell or Generic Hosts for WinService or Stub Application or AVP - spyware removal module or Microsoft Windows critical update or Version Rewrite

belongs to software Microsoft Windows Operating System or IPSEC Services, Protected Storage, Security Accounts Manager or CNG Key Isolation, Security Accounts Manager or symantex or symdfsdf or update or worm2007 or NT LM Security Support Provider, IPSEC Services, Protected Storage, Security Accounts Manager

by Microsoft (www.microsoft.com) or MskSoftStudy or noOrg (www.noorg.org) or AceSoft Corp all rights reserved or IT University or s708051Jm103533QSt619382493o or Jznof or 12,326 KB.

Description: The original lsass.exe from Microsoft is an important part of Windows, but often causes problems. Lsass.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 8/7/XP are 13,312 bytes (90% of all occurrences), 11,776 bytes and 15 more variants. http://www.file.net/process/lsass.exe.html 
The program is not visible. Lsass.exe is a trustworthy file from Microsoft. The application uses ports to connect to or from a LAN or the Internet. Therefore the technical security rating is 11% dangerous, however you should also read the user reviews.

Recommended: Identify lsass.exe related errors

Viruses with the same file name

Is lsass.exe a virus? No, it is not. The true lsass.exe file is a safe Microsoft Windows system process, called "LSA Shell". However, writers of malware programs, such as viruses, worms, and Trojans deliberately give their processes the same file name to escape detection. Viruses with the same file name are e.g. Trojan.Win32.VB.bdo or Trojan.Win32.Refroso.cez (detected by Kaspersky), and Backdoor:Win32/VB.AT or VirTool:Win32/Injector.gen!AD (detected by Microsoft).
To ensure that no rogue lsass.exe is running on your PC, click here to run a Free Malware Scan.

How to recognize suspicious variants?

External information from Paul Collins:
There are different files with the same name:

Important: Some malware disguises itself as lsass.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the lsass.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.

Score

User Comments

Lsass.exe is a process used by Microsoft's Local Security Authority Subsystem Service. This process looks after computer security by checking the details the user supplies when logging into their PC. However, some trojans or viruses hide behind the guise of processes like lsass.exe, and can have serious impact on your security. Always have an antivirus running in the background.
  CedFalz   (further information)
Safe system file if in the [Bootdrive]\[windows directory]\system32 folder. Note even the legitimate version of this file can result in a forced shutdown IF it crashes.
  John  
its a system file use for authuntication
  Zee  
lsass is completely safe unless operating from outside system32. In order to prevent malware from attacking/abusing it, make sure to keep windows updated.
  Deeza  

  heqta   (further information)
The actual Windows process (System) is important. One that isn't in System is probably a virus.
   
Safe, but...uses more resources than my anti virus while scanning. Thats real High, for a process that controls user log ons.Why is this so high especially if I'm logged on
  Tony  
This file is vital to the Windows operating system. To what I know, it operates within Windows 7 and is a module to assist in the Winlogon process. It's safe as long as it's from the "(drive letter):\(your windows directory)\System32" directory.
  Lildirt  
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of lsass.exe: based on 704 votes with 9 reviews. 261 users think lsass.exe is essential for Windows or an installed application. 29 users think it's probably harmless. 132 users think it's neither essential nor dangerous. 82 users suspect danger. 200 users think lsass.exe is dangerous and recommend removing it. 72 users don't grade lsass.exe ("not sure about it").


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Best practices for resolving lsass issues

A clean and tidy computer is the key requirement for avoiding problems with lsass. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off doing a repair of your installation, or in the case of Windows 8, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the lsass.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.



Other processes

lsass.exe [all]