What is lsmass.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 lsmass.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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Lsmass.exe file information

Windows Task Manager with lsmass
Lsmass.exe process in Windows Task Manager

The process known as Virage or LMS or NT Kernel & System belongs to software Virage or Notepad or LMS or JPEG View Application or Editor or NT Kernel & System or ConsoleApplication1 by Microsoft (

Description: Lsmass.exe is not essential for the Windows OS and causes relatively few problems. Lsmass.exe is located in the "C:\Program Files\Common Files" folder or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 13,179,660 bytes (71% of all occurrences), 33,280 bytes, 35,840 bytes, 154,112 bytes or 37,376 bytes. 
The program is not visible. Lsmass.exe is not a Windows core file. It is a file with no information about its developer. Therefore the technical security rating is 58% dangerous.

Recommended: Identify lsmass.exe related errors

Important: Some malware camouflages itself as lsmass.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example Trojan.Gen or WS.Reputation.1 (detected by Symantec), and Backdoor:MSIL/Pontoeb.J or Backdoor:MSIL/Pontoeb.N (detected by Microsoft). Therefore, you should check the lsmass.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.


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Best practices for resolving lsmass issues

A clean and tidy computer is the key requirement for avoiding problems with lsmass. 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 lsmass.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

lsmass.exe [all]