Need to check Mac High Sierra for Root kits, key loggers and serious malware.

The user has a MacBook Pro (Retina, 13-inch, Late 2013)

They accepted a bogus phone call from "Apple Tech Support" and allowed them to run all sorts of 'diagnostics and repairs'   However, they didn't pay any money.

In their defense, they had been recently informed by their bank that some sort of Trojan horse was affecting their computer, and they mistakenly assumed that this was a follow up call.

Apple support had them install the latest version of MalwareBytes Mac, and nothing has been found after the initial scan and cleanup.

For peace of mind, are there other applications that can check for hidden threats?

Thanks.
computerlarryAsked:
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Tom CieslikIT EngineerCommented:
I thin it will be much more wise to do full system backup using Time Machine and reinstall OS.
You can do it by restarting computer with Command+R button together then install new OSX directly from Apple Cloud.
After that you can restore some applications and files/documents from time machine backup
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LearnctxEngineerCommented:
MalwareBytes, Rootkit Hunter, Chkrootkit are the way to go. You would want to make sure they haven't modified the DNS servers in the NIC config as well to go to their DNS servers instead of whatever you are normally given by your router or ISP. But I am with Tom on this, once your machine has been potentially breached, assume it is completely compromised and rebuild.
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David FavorLinux/LXD/WordPress/Hosting SavantCommented:
I likely take Tom's suggestion if I had a clean backup.

Or Learnctx, if I had no clean backup or if a full reinstall seem too painful.

https://www.macports.org provides easy to install ports of Rootkit Hunter + Chkrootkit.

https://www.malwarebytes.com provides MalwareBytes.
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