All of these copycats of the original malware, Cryptolocker, work the same way, encrypting your files in the background, which takes quite a while. (A lot of people are going to find their files encrypted when they go to work Monday.) A free detection program has been available for a long time from Foolsh.I.T.com. (He claims the 4 letter word ending was inadvertent - remove extra dots to reach the site.) The paid version automatically updates. Malwarebytes paid version, when run constantly, does the same now. If encryption starts, both stop it and ask you if you are the one doing it intentionally. It's nice for peace of mind. Bazza, here's an Infoworld article advocating for more Mac enterprise use: LINK