A developer using Claude Code to help build a temperature monitor app got a friendly warning from the coding agent. “Your Mac is running a crypto miner that I didn’t put there,” flagged the helpful agent. “I saw xmrig using about 1175% CPU, roughly 12 cores,” it informed its human master. Perhaps developer and Redditor UntilHEX should have sensed the crypto miner’s presence without AI help, as they admitted the malware’s presence “explains why my Mac has been running like s**t.”

Ironically, the cryptomining malware’s nefarious CPU cycle hogging activity is what may have led to its discovery and demise. Pondering over a screenshot of the Claude Code window, we see that this malware was probably added to the Mac’s startup roster on August 29. It looks like UntilHEX was inspired to develop a Mac temperature monitor app after this infection to track and diagnose why the computer was running so hot.

Claude stepped in after the Redditor was concerned about a dump of the Mac’s raw temperature sensor readings. “They seemed far too high,” commented UntilHEX in the social media post. Indeed, the well-known coding agent pointed out that the CPU was peaking at a very toasty 112 degrees Celsius. It explained this was due to a sustained heavy load, specifically “xmrig using about 1175% CPU, roughly 12 cores.” We don’t know how many cores the Mac being used had, but maybe 12 were all of them.

Claude Code went on to describe how the crypto miner software had hidden itself on the Apple computer and ran at startup.

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