An anonymous reader writes: Attackers have infected two installers of Transmission version 2.90 for OS X with ransomware they have named "KeRanger". This is the first-known fully functional ransomware for OS X. All users are advised to upgrade to 2.92 immediately.
"On March 4, we detected that the Transmission BitTorrent client installer for OS X was infected with ransomware, just a few hours after installers were initially posted. We have named this Ransomware “KeRanger.” The only previous ransomware for OS X we are aware of is FileCoder, discovered by Kaspersky Lab in 2014. As FileCoder was incomplete at the time of its discovery, we believe KeRanger is the first fully functional ransomware seen on the OS X platform."