There are a number of variations of this scam around the internet, but the symptoms are very common, and here is just one example. This example happened in Google Chrome, on a PC, I have not tested on the MAC yet, but have had similar situations on my MAC.
You type into your browser to go to YouTube but you accidental type the address incorrectly, say “YouTuber”, in this example.
Next thing you know, a Pop Up or “PUP” (Potentially Unwanted Program”) comes on the screen and says your computer has been infected. See the following message and screenshot.
Your computer with the IP address (an IP address will show here) has been infected by the Virus RDN/Yahlover.worm!055BCCAC9FEC-Your information (for example, passwords, messages, and credit cards) have been stolen. Call the Technical Support number below to protect your files and identity from further damage.
It even locks you onto the page, with seemingly no way to get out of the browser, and for a lot of users, this only reinforces, that the message must indeed be legitimate.
I have heard they will ask you to pay an amount, say somewhere between $30 – $150, to fix your computer, usually by someone pretty rude!
I was going to actually call the number listed, in this case 1-888-373-0151, and record the actual phone call, but trust me, this is a scam and there are many variations of it!
I recommend if this happens to you, launch task manager and “End Task” on your browser to force it closed, or if on a MAC OS “Force Quit” your browser.
I personally clear my browser cache, and immediately run something like Malwarebytes scanner, just to be sure.
One other thing worth mentioning, I always recommend to people, to use a password manager, to store your usernames, passwords, etc. This is just one more reason to use one. Don’t store your password or login information in your browser, that’s one potential place they are probably trying to steal it from.