URGENT: What's the best mac app to find & delete “maalware which uses a low-level device driver build-in CPU and updates its signatures every 4 hours to keep antivirus silent”?

I received this email recently and would like to find/confirm if any malware is in my macOS System::

"Hello!

I'm the Chinese software engineer who hacked into your device OS.

I've been watching you for month now. The thing is, you've been infected with malware through the adult website you visited... I have downloaded all confidential information from your system and I got some more evidence.

In case you're not familiar with it, I'll explain.

The virus gives me full …

antivirus app build cpu device mac privacy signatures updates