nssm.exe is a application which is most likely legit. So, if nssm.exe is on your PC, it is most likely ok, and will NOT be a cause for concern. Even if your system is clean, it is still recommended to use a well-known antivirus with a good track record, in order to defend your system against threats.
The default name and path where this application is stored is
C:\Program Files (x86)\ExpressVPN\bootstrap\AMD64\nssm.exe.
The MD5 fingerprint for this program is beceae2fdc4f7729a93e94ac2ccd78cc.
This program is registered as a Windows service. This means it runs on your PC in background, usually without displaying any user interface to you. Most Windows services are useful programs, which provide useful features to other applications or to Windows in general.
64-bit code has been detected. This application can use the full power of a current computer processor.
The description stored in the file is The non-sucking service manager.
File version 2.24.
Copyright notice Public Domain; Author Iain Patterson 2003-2014.
Some insecure functions of Windows appear to be used, such as functions for recording the keyboard. We advise you to perform more in-depth research about this program.
The digital certificate is missing from this program. The authors did not sign it. This is usually bad.
It has an uninstall routine, which is a good sign. si are uninstall.