Like many Mac users, I used to think that I was safe from hackers. As with most things too good to be true, sadly this is not the case. I have quickly started to think differently about how my Mac could be vulnerable.
It’s a bit of a nightmare. Over the past weekend, a Mac app called Transmission was infected with “ransomware.” If you had downloaded the app, hackers could have taken over your computer and demanded you pay to unlock it. Before you freak out, you should know that the creator of the app says only about 6,500 people downloaded the software. Apple quickly disabled the certificate that allowed the software to be installed to a Mac computer. It’s likely that many hadn’t run it by that time. Apple confirmed to me that, to date, no one was impacted by the attack.
http://blogs.wsj.com/digits/2016/03/09/macs-and-malware-what-you-can-do-to-stay-safe/