[Senpie]

1. You could try a reverse image search, if that comes up with nothing than there really isn't another way.
2. You can easily do a clean-up by checking out this simple guide: https://malwaretips.com/blogs/malware-re...r-windows/
3. You could use Wireshark to see what connections are being made, but it really isn't that simple of a tool to use.
4. If you physically harmed the person who done this, yes, you could face charges depending on how far the other person is willing to go.