Various users already found Nagstamon being detected as malware – see Despite different virus scanners scanning results ( Nagstamon is not virus infested.

The binaries for Windows and macOS are packed with PyInstaller from According to their issue tracker they already know the problem of being detected as malware, as noticed in They also state that there is not much more to do than telling the antivirus software vendors that they are wrong.

So there is no real solution we could provide – sorry to say that, but just tell your antivirus software makers to fix their detection engines.