Wiping is a hard drive, the only way to remove malware? A friend has fallen for a scam

A friend has been scammed of support and installed malware on her iMac.  She called Apple (I made sure it was really Apple), and they remotely scanned his computer, deleted the program protection antivirus scam scam, then scanned his computer again and pronounced it's clean.  But I read that the only way to remove the installed malware is the erasure of the hard drive, reinstall the operating system, etc.   Therefore its really clear computer of malware, or does need to wipe the hard disk to be sure of that?

There is no need to wipe the HD.

Tags: Mac

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