Apple users were targeted by malicious hackers over the weekend in the first known case of a ransomware attack on Apple Mac computers, Palo Alto Networks has confirmed.
The ransomware campaign, dubbed “KeRanger” by the security firm that found it, was hidden in a BitTorrent installer for software called Transmission, which allows Mac users to download videos, music and software via a peer-to-peer network.
Ransomware campaigns silently infiltrate a user’s computer, then encrypt that machine’s data, asking the user to pay a ransom in digital currency to release their data.
Palo Alto Network said the ransomware is programmed to activate three days after infection, meaning users who unwittingly contracted the virus on Friday, the day Palo Alto Networks found the virus, will be hit on Monday March 7.
“Attackers infected two installers of Transmission version 2.90 with KeRanger on the morning of March 4. When we identified the issue, the infected DMG files were still available for downloading from the Transmission site.
“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,” they wrote.
The transmission software affected is designed for users of OS X, Apple Mac’s latest operating system.
Palo Alto Networks says that Apple revoked the abused certificate and updated its antivirus signature after it was alerted to the attack. Palo Alto Networks has also updated its software to stop KeRanger from affecting users.
Transmission itself is running an urgent message on its website advising users to upgrade to the latest version that will remove the ransomware from an infected machine.
“Read immediately!!!!,” the warning says. “Everyone running 2.90 on OS X should immediately upgrade to and run 2.92, as they may have downloaded a malware-infected file. This new version will make sure that the “OSX.KeRanger.A” ransomware is correctly removed from your computer.”
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