How to remove the lsass1 virus

Most antivirus programs identify lsass1.exe as malware—for instance McAfee identifies it as PWS-Banker.gen.b, and Avast identifies it as Win32:Spyware-gen.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the lsass1.exe malware

Lsass1.exe file information

The lsass1.exe process contains no information about its author.

Description: Lsass1.exe is not essential for Windows and will often cause problems. The lsass1.exe file is located in the C:\Windows folder. The file size on Windows 10/8/7/XP is 1,320,448 bytes. 
There is no description of the program. It is located in the Windows folder, but it is not a Windows core file. It can change the behavior of other programs or manipulate other programs. The program has no visible window. The file is not a Windows core file. Lsass1.exe is able to connect to the Internet, record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 96% dangerous.

Recommended: Identify lsass1.exe related errors

If lsass1.exe is located in the C:\Windows\System32 folder, the security rating is 96% dangerous. The file size is 43,567 bytes. The software has no file description. The file is an unknown file in the Windows folder. The program has no visible window. The software starts when Windows starts (see Registry key: MACHINE\Run). The application listens for or sends data on open ports to a LAN or the Internet. The lsass1.exe file is not a Windows core file.

Important: You should check the lsass1.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 lsass1 issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active lsass1 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the lsass1.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. 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 repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

lsass1.exe [all]