YEP. Proof of concept, but verified.
http://motherboard.vice.com/read/we-now-have-proof-that-macs-can-get-ransomware
https://www.linkedin.com/pulse/mabouia-born-first-mac-osx-ransomware-poc-rafael-salema-marques
Simple patch will eradicate the threat.
I'd not gonna buy some mcaffee nor symantec whatever in my Linux and apple devices, gimme a break.
In fact I don't even use any in my Windoze devices except for Malwarebytes that does most I need.