Claude caught a hidden cryptominer on a user's Mac while building a temperature app

kimmonismus · x · 2026-10-19

While building a temperature monitor app, Claude noticed the user's Mac CPU peaking at 112°C with xmrig using 1175% CPU (about 12 cores) and flagged: "your Mac is running a cryptominer that I didn't put there." It traced the miner to /tmp/rigupdater mining to pool.hashvault.sh, found a random-named LaunchAgent persistence item from Aug 29 running an encoded bash script with KeepAlive — a classic malware pattern. Claude killed nothing but warned the malware exposes everything including the GitHub login. A striking showcase of agents as accidental security auditors.

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