FOR DECADES, MAC users had to worry less about malware than their Windows-using counterparts, but over the last few years that’s begun to change. In an attempt to crack down on growing threats like adware and ransomware, in February Apple began “notarizing” all macOS applications, a vetting process designed to weed out illegitimate or malicious apps. Even software distributed outside of the Mac App Store now needs notarization, or users wouldn’t be able to run them without special workarounds. Seven months later, though, researchers have found an active adware campaign attacking Mac users with the same old payloads—and the malware has been fully notarized by Apple.
