Troubleshooting some nasty Safari malware

“I need Apple advice,” My sister texted me last week. “I got a message that my computer is blocked due to an unexpected error. It gives me a number to call to fix it. Does that sound legit?”

No. It did not sound legit. What’s worse, the error message gave her an 800 number to call, which she did, and the person on the other end of the line offered to share her screen and tried to sell her $200 in security software.