How to remove the ntuser_mssec virus

Most antivirus programs identify ntuser_mssec.exe as malware—for instance Microsoft identifies it as Trojan:Win32/Meredrop or TrojanDownloader:Win32/Carberp.A, and Symantec identifies it as Trojan Horse or Packed.Coravint!gen1.

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.

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Ntuser_mssec.exe file information

Windows Task Manager with ntuser_mssec
Ntuser_mssec.exe process in Windows Task Manager

The process known as buRkLNBHdXKVBJO or Kernel Veryfier belongs to software bUtkOdRDcaCcqvgApolt Application or Kernel Veryfier by eSXi (

Description: Ntuser_mssec.exe is not essential for Windows and will often cause problems. The ntuser_mssec.exe file is located in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 72,704 bytes (50% of all occurrences) or 59,392 bytes. 
There is no description of the program. The process starts upon Windows startup (see Registry key: User Shell Folders). Ntuser_mssec.exe is not a Windows system file. Therefore the technical security rating is 45% dangerous.

Recommended: Identify ntuser_mssec.exe related errors

If ntuser_mssec.exe is located in a subfolder of "C:\Program Files", the security rating is 36% dangerous. The file size is 40,960 bytes. The program has a visible window. There is no information about the author of the file. The process starts upon Windows startup (see Registry key: User Shell Folders). The ntuser_mssec.exe file is not a Windows core file. Ntuser_mssec.exe is able to record keyboard and mouse inputs.

Important: You should check the ntuser_mssec.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 ntuser_mssec issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active ntuser_mssec process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the ntuser_mssec.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

ntuser_mssec.exe [all]