CNBC isn't a website I'd expect to read anything tech-related on, but there are actually a few details in this article: http://www.cnbc.com/2016/03/06/reuters-

CNBC isn't a website I'd expect to read anything tech-related on, but there are actually a few details in this article: http://www.cnbc.com/2016/03/06/reuters-america-apple-users-targeted-in-first-known-mac-ransomware-campaign.html http://www.cnbc.com/2016/03/06/reuters-america-apple-users-t... - It's Ransomware. - Seems to be a 3 day grace-period (chance to remove it, possibly). - The Transmission developer certificate [Gatekeeper] has been revoked.