That cryptominer caused temperature to spike to 112 degrees Celsius (233.6 degrees Farenheit) and CPU usage of 1175 percent. (With modern Macs, CPU usage is measured per core, so usage of over 100 percent is common.) Claude was able to trace the location of the cryptominer to a “LaunchAgents” folder that was put there “before I built anything.”
Despite Reddit users’ suspicions over Claude’s supposed innocence, it’s unclear exactly how the crypto malware was installed on the Mac. Claude offered to “clean it up” by quarantining the software in a folder, though UntilHEX had to manually remove one component because Claude didn’t have access to the part of macOS it needed. UntilHEX then ran a security check was done using a third-party app to make sure it was removed, and their Mac began to run normal again.
How to protect yourself from malware
This issue is unlikely to affect most users, but if you’re running AI agents, it’s a good idea to stay on track of your Mac’s vitals, which you can track in Activity Monitor. And if your agent has unfettered access to your Mac, it’s probably a good idea to keep a close eye on what it’s doing when you’re not around.
For everyone else, the easiest way to protect yourself from malware is to avoid downloading software from unfamiliar repositories. Apple has vetted software in the Mac App Store, and it is the safest way to get apps. If you prefer not to patronize the Mac App Store, then buy software directly from the developer and their website. If you insist on using cracked software, you will always risk malware exposure.
Never open links in emails or texts you receive from unknown and unexpected sources. If you get a message that looks like it is from an entity that you do business with, check the sender’s email address and inspect the URL carefully. If you see a link or button, you can Control-click it, select Copy Link Address, and then paste it into a text editor to see the actual URL and check it.
Macworld has several guides to help, including a guide on whether or not you need antivirus software, a list of Mac viruses, malware, and trojans, and comparison of Mac security software.
