Coding

~1175% CPU: Claude Code Spotted a Hidden Crypto Miner While Building Him a Mac Temperature App

  • Level Intermediate
  • Setup1–3 hrs (estimated)
  • Evidence Some evidence
  • CostNot stated in source
  • No-codeNo
Claude CodeSource-linkedNeeds verification

What they did

Mac running hot and slow? He had Claude Code build him a temperature monitor app. When it checked the raw sensor readings, the numbers looked far too high, so it looked at what was using the CPU. It found a crypto miner (xmrig) running at about 1175% CPU, roughly 12 cores. Commenters noted it wasn't a virus scan: it noticed impossible data and dug in.

How it went

A list of what's using your computer, with anything suspicious flagged.

Worth knowing

  • Reddit post that the user also shared in other subreddits. Miners often reinstall themselves; commenters advise backing up only your files and doing a clean reinstall.

Prompt

Cleaned version rewritten from the source — not a direct quote.

My Mac is slow and hot. 1) Show me the top processes by CPU and memory, and anything set to start automatically (launch agents, login items, cron jobs). 2) Flag anything unknown or suspicious and explain what it is. 3) Don't delete anything; tell me the safest way to remove it.

Recommended

Try it in Grok Bot

Grok Bot with computer access can run the same process check.

  1. Copy the prompt (button below).
  2. Open Grok Bot chat and paste it. Replace any [bracketed] placeholders.
  3. Connect the listed tools (as needed) as connectors when Grok Bot asks.
  4. If the task repeats, ask: "Make this a daily routine."

Alternatives: the same prompt works in Claude Code, Claude, ChatGPT Agent, OpenClaw.

Set it up

Stack: Claude Code + macOS terminal

  1. Read the original source for full context.
  2. Connect the tools your agent needs.
  3. Paste the prompt and replace [bracketed] placeholders.
  4. Run once manually and check the output before scheduling it.

Generic suggested steps, not from the source.

Evidence

First-hand Reddit post: xmrig at ~1175% CPU, ~12 cores, found while building a temperature app. Thread notes cross-posting. Nothing sold

Source: Reddit · 2026-10-19 · Verified by us: not yet · Report broken or outdated

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