# Claude Code AI finds a cryptominer on a Mac; says it didn’t put it there

> Source: <https://9to5mac.com/2026/10/26/claude-code-ai-finds-a-cryptominer-on-a-mac-says-it-didnt-put-it-there/>
> Published: 2026-10-26 11:34:41+00:00

A Redditor used [Claude](https://9to5mac.com/guides/claude/) Code AI to build a [M](https://9to5mac.com/guides/mac/)[a](https://9to5mac.com/guides/mac/)[c](https://9to5mac.com/guides/mac/) temperature monitor app and found that the machine was running much hotter than expected. Claude reported that it found a crypto miner using more than 1,000% of the CPU cycles – then added an unprompted comment denying having installed it.

Some Redditors were understandably suspicious of Claude’s spontaneous comment that it wasn’t responsible for installing the rogue app …