What is cmmon32.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 cmmon32.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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Cmmon32.exe file information

Windows Task Manager with cmmon32
Cmmon32.exe process in Windows Task Manager

The process known as Microsoft Connection Manager Monitor or ab0bb9e3b144cac60965e5440a4ee583 belongs to software ab0bb9e3b144cac60965e5440a4ee583 or Microsoft® Connection Manager by Microsoft ( or SWIS.

Description: The original cmmon32.exe is an important part of Windows and rarely causes problems. The file cmmon32.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 60,928 bytes (42% of all occurrences), 43,008 bytes, 39,936 bytes, 64,000 bytes or 53,760 bytes. 
The program has no visible window. It is an unknown file in the Windows folder. It can change the behavior of other programs or manipulate other programs. The file is not a Windows system file. Cmmon32.exe is able to monitor applications. Therefore the technical security rating is 46% dangerous.

Recommended: Identify cmmon32.exe related errors

If cmmon32.exe is located in the Windows folder for temporary files, the security rating is 26% dangerous. The file size is 548,941 bytes. The program has a visible window. The program has no file description. The software starts upon Windows startup (see Registry key: Run). Cmmon32.exe is not a Windows system file. cmmon32.exe appears to be a compressed file.

External information from Paul Collins:

Important: Some malware disguises itself as cmmon32.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the cmmon32.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 cmmon32 issues

A clean and tidy computer is the key requirement for avoiding problems with cmmon32. 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 cmmon32.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

cmmon32.exe [all]