The “Microsoft Customer Support” scam: Today’s number is 866-587-7384.
Your screen locks up. You can’t close your browser. You can’t go back. A computerized voice starts talking to you about pornographic malware. A warning message tells you your data is being stolen. You are given a phone number to call for help removing the malware.
Do NOT call this number. It has nothing to do with Microsoft. The page you are seeing is a malicious script that has been loaded from a website that you visited, probably from a banner ad or something else that the page owner is unaware of, and is designed to scare you. If you follow the steps the “support agent” gives you, he or she will have you give them total control of your system. From there, anything can happen and none of it will be good.
In the event that you went through this process with an “agent,” it will be critical for you to run an anti-malware program such as Malwarebytes (I don’t work for them), or have your computer cleaned by a professional, before you do anything else.
Be careful out there.
The Old Wolf has spoken.
Does a hard shutdown clear this?
Yes. You can also clear it with task manager (Ctrl-Alt-Delete) by shutting down your browser.