What is msa.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 msa.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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Msa.exe file information

Windows Task Manager with msa
Msa.exe process in Windows Task Manager

The process known as MS Antivirus appears to belong to software MS Antivirus by unknown.

Description: Msa.exe is not essential for Windows and will often cause problems. Msa.exe is located in the C:\Windows folder. Known file sizes on Windows 10/8/7/XP are 136,704 bytes (3% of all occurrences), 148,480 bytes and 132 more variants. 
There is no description of the program. The msa.exe file is not a Windows system file. Msa.exe is located in the Windows folder, but it is not a Windows core file. The program has no visible window. The process listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 81% dangerous, however you should also read the user reviews.

Recommended: Identify msa.exe related errors

If msa.exe is located in a subfolder of "C:\Program Files", the security rating is 22% dangerous. The file size is 412,160 bytes. The program has a visible window. There is no file information. Msa.exe is not a Windows core file. Msa.exe is able to monitor applications.

External information from Paul Collins:

Important: Some malware also uses the file name msa.exe, for example Trojan.Renos.NII (detected by BitDefender), and TrojanDownloader:Win32/Renos.DZ or TrojanDownloader:Win32/Renos.JJ (detected by Microsoft). Therefore, you should check the msa.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

trojan - causeses pop-ups to occur
uses alot of cpu, may rewrite search engien result links
is virus that create by virus exist in temp folder with names a.exe & b.exe & c.exe
  Ali Saket  
    (further information)

Rating chart

Summary: Average user rating of msa.exe: based on 19 votes with 5 user comments. 4 users think msa.exe is essential for Windows or an installed application. 15 users think msa.exe is dangerous and recommend removing it.

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Best practices for resolving msa issues

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

To help you analyze the msa.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

msa.exe [all]