What is lsas.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 lsas.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.

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Lsas.exe file information

Windows Task Manager with lsas
Lsas.exe process in Windows Task Manager

The process known as BI belongs to software Microsoft Windows Operating System by ShengTai'An Electronic Commerce Development Co. or Microsoft (

Description: Lsas.exe is not essential for Windows and will often cause problems. Lsas.exe is located in a subfolder of "C:\Program Files (x86)"—in most cases C:\Program Files (x86)\t_201602011410\201602011410\. Known file sizes on Windows 10/8/7/XP are 557,184 bytes (44% of all occurrences), 554,496 bytes or 561,080 bytes. 
There is no information about the author of the file. The file is not a Windows system file. The program starts upon Windows startup (see Registry key: Run). Lsas.exe is able to monitor applications and manipulate other programs. Therefore the technical security rating is 58% dangerous, but you should also take into account the user reviews.

Recommended: Identify lsas.exe related errors

If lsas.exe is located in a subfolder of C:\Windows, the security rating is 78% dangerous. The file size is 279,552 bytes (50% of all occurrences) or 122,880 bytes. The lsas.exe file is located in the Windows folder, but it is not a Windows core file. The program has no visible window. The program uses ports to connect to or from a LAN or the Internet. Lsas.exe is not a Windows system file. Lsas.exe is able to monitor applications.

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

Important: Some malware also uses the file name lsas.exe, for example Trojan.Generic.16340429 (detected by BitDefender), and PUA.Gen.4 (detected by Symantec). Therefore, you should check the lsas.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.


User Comments

ist der größte Mist, belastet mein system bis zu 100%
versucht selbstständig Verbindung herzustellen zu
It's from a chinese adware programm. It creats a folder in C:\Program Files (x86)\t_201601161033\201601161033.... based on auds.exe and Icas.exe
  Kostas Konstantinidis  

Summary: Average user rating of lsas.exe: based on 4 votes with 4 user comments. 4 users think lsas.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving lsas issues

A clean and tidy computer is the key requirement for avoiding problems with lsas. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the lsas.exe process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

lsas.exe [all]