A new, free macOS-based ransomware as a service has surfaced on the darkweb. Researchers say once the malware encrypts users’ files, they’re “pretty much gone for good.”

The nation-state sponsored hacker group allegedly behind the 2014 attack against Sony Pictures Entertainment has been linked to similar intrusions against a number of companies in South Korea including the Dark Seoul and Operation Troy attacks. A coalition of security companies called Operation Blockbuster, including Kaspersky Lab, Novetta, AlienVault, Invincea, ThreatConnect, Volexity, Symantec, and PunchCyber today published...