Mac users have been targeted by hackers with "ransomware" in what is believed to be the first attack campaign of its kind against users of Apple's operating system.
Ransomware is a type of malware – or malicious software – that has been on the rise recently and steals your files and data, encrypts it, and then asks you to pay money to get it back.
Security firm Palo Alto Networks, discovered the particular ransomware, known as "KeRanger" targeting Mac users on Friday and explained how it was infecting systems in a blog post on Sunday.
A piece of "BitTorrent" software known as "Transmission" was infected with KeRanger, so that when Mac users were downloading the latest version of the product, the ransomware was installed on their machine.
"Transmission is an open source project. It's possible that Transmission's official website was compromised and the files were replaced by re-compiled malicious versions, but we can't confirm how this infection occurred," Palo Alto said in the blog entry.