You have a bad virus. Worst than most it sounds like. Worst case scenario u have to restore the OS.
You do indeed have a bad virus and it’s one that probably came through an email. It is almost impossible to get rid of once it is in place. Last year my office computer became infected with this pest because the tech group temporarily shut down some AV and firewall protections for testing and forgot to turn it back on. I am on the information technology faculty side of our university and our security experts and I could not come up with a fix so the machine had to be reimaged. It affected any machine, Windows, Linux or Apple that received an email during that time from whatever the source and a few became infected when an infected machine sent an email to an uninfected machine. Good luck and I hope you have a recent backup.