Most antivirus programs identify STM.exe as malware—such as TrendMicro identifies it as ADW_WINFIXERFC or ADW_WINFIXER, and Symantec identifies it as Backdoor.Graybird!Gen or PCPrivacyTool.
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The process does not contain any indication of the producer (the software author) or the software with which it is associated.
Description: STM.exe is not essential for Windows and will often cause problems. The file STM.exe is located in a subfolder of C:\ or sometimes in a subfolder of the user's profile folder.
Known file sizes on Windows 10/8/7/XP are 3,147,913 bytes (60% of all occurrences) or 921,085 bytes.
It is a file with no information about its developer. The program is not visible. The file is not a Windows core file. Therefore the technical security rating is 58% dangerous.
Recommended: Identify STM.exe related errors
If STM.exe is located in a subfolder of "C:\Program Files\Common Files", the security rating is 60% dangerous. The file size is 598,016 bytes (85% of all occurrences) or 426,496 bytes. There is no description of the program. The application starts when Windows starts (see Registry key: MACHINE\Run). STM.exe is not a Windows core file. The program has no visible window. STM.exe is able to record keyboard and mouse inputs.
Important: You should check the STM.exe process on your PC to see if it is a threat. If STM.exe has changed your browser's search engine and start page, you can recover your browser's default settings as follows:Reset default browser settings for Internet-Explorer ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active STM process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the STM.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.