What Is Crypto Jacking? How It Works and How to Prevent It

Cryptojacking is an attack that secretly uses your device to mine cryptocurrency for someone else. It arrives through a malware download or a hidden script on a website, then runs quietly in the background.

Watch for sluggish performance, overheating, fast battery drain, or higher power bills. A spike in CPU usage with no app open, visible in Task Manager or Activity Monitor, is a strong clue.

Keep your software updated, avoid suspicious links, and use an ad blocker with an anti-cryptomining extension. Businesses should add security training, cloud audits, endpoint protection, and strong identity checks.

There are three main types: browser-based, host-based, and memory-based. Browser-based mines through an open tab, host-based installs on your device, and memory-based runs in memory to stay hidden.

No, a wallet address alone can’t let anyone drain your funds, because moving money requires your private key. It can, though, help scammers target you with tailored phishing and social engineering.

Reputable ad blockers and anti-cryptomining browser extensions stop most in-browser miners, while anti-malware and endpoint detection tools catch installed miners. Keeping your browser and operating system patched adds another layer.