What is stacmon.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 stacmon.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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Stacmon.exe file information

Windows Task Manager with stacmon
Stacmon.exe process in Windows Task Manager

The process known as stacmon belongs to software SigmaTel (version AC97 Audio Drivers) or SigmaTel C-Major Audio or Driver audio di SigmaTel (version AC97) by SigmaTel (

Description: Stacmon.exe is not essential for Windows and will often cause problems. The stacmon.exe file is located in a subfolder of "C:\Program Files" (typically C:\Program Files\SigmaTel\SigmaTel AC97 Audio Drivers\). Known file sizes on Windows 10/8/7/XP are 86,073 bytes (44% of all occurrences), 90,169 bytes, 45,056 bytes or 49,209 bytes. 
The program has no file description. The program is not visible. Stacmon.exe is not a Windows system file. The application starts when Windows starts (see Registry key: MACHINE\Run). Therefore the technical security rating is 56% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you have any problems with stacmon.exe, you may also uninstall the associated program (Start > Control Panel > Uninstall a Program > SigmaTel AC97 Audio Drivers or SigmaTel AC97 Audio-Treiber).

Recommended: Identify stacmon.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as stacmon.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the stacmon.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

Its a part of my onboard audio card
Bestandteil von Sony Vaio Installationspaket
I have disable in auto-start with no ill effect
stacmon.exe is installed alongside for Sigmatel's range of audio hardware and provides extra diagnostics functionality for this range of products. "This program is a non-essential process, but should not be terminated unless suspected to be causing problems.

Rating chart

Summary: Average user rating of stacmon.exe: based on 8 votes with 5 user comments. 2 users think stacmon.exe is essential for Windows or an installed application. 2 users think it's probably harmless. 4 users think it's neither essential nor dangerous.

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Best practices for resolving stacmon issues

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

stacmon.exe [all]