http://9to5mac.com/2016/03/06/first-os-x-ransomware-detected-in-the-wild-will-maliciously-encrypt-hard-drives-on-infected-macs/
It was just a matter of time… http://www.pcworld.com/article/3003987/business-security/ransomware-for-mac-is-nothing-to-worry-about-for-now.html
And here https://blog.malwarebytes.org/mac/2016/03/first-mac-ransomware-spotted/?platform=hootsuite