From our friends at Bleeping Computer® LLC : Pirated Final Cut Pro infects your Mac with cryptomining malware To be safer, please keep your OS software up-to-date and beware the use of Torrent apps and “The Pirate Bay” site.
I assume that XProtect and Gatekeeper should block this malware from running in the background? Oh wait, I just read that XProtect didn't detect it, which means that it's a very barebones AV. But Gatekeeper should warn about it, but when people already know that it's pirated software, they might ignore it.