Most antivirus programs identify mstdc.exe as malware—such as Kaspersky identifies it as not-a-virus:RiskTool.Win64.BitCoinMiner.mh or not-a-virus:RiskTool.Win64.BitCoinMiner.ank, and TrendMicro identifies it as HKTL_COINMINE or HKTL_BITCOINMINER.
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Description: Mstdc.exe is not essential for Windows and will often cause problems. Mstdc.exe is located in a subfolder of C:\Windows—e.g. C:\Windows\Temp\mst\.
Known file sizes on Windows 10/8/7/XP are 804,153 bytes (40% of all occurrences), 13,179,660 bytes or 1,698,448 bytes.
There is no description of the program. The program has no visible window. The program uses ports to connect to or from a LAN or the Internet. Mstdc.exe is not a Windows core file. It is located in the Windows folder, but it is not a Windows core file. Therefore the technical security rating is 98% dangerous.
Recommended: Identify mstdc.exe related errors
Important: You should check the mstdc.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.
The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active mstdc process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the mstdc.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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.