Cryptojacking
Um tipo de crime cibernético em que um invasor usa secretamente o poder de processamento de uma vítima para minerar criptomoedas.
A mineração por navegador explodiu em 2017 com o Coinhive. A defesa inclui monitoramento de rede (buscando pools de mineração), bloqueadores de anúncios e políticas estritas de IAM.
graph LR
Center["Cryptojacking"]:::main
Rel_cryptographic_hashing["cryptographic-hashing"]:::related -.-> Center
click Rel_cryptographic_hashing "/terms/cryptographic-hashing"
Rel_cryptocurrency_investigations["cryptocurrency-investigations"]:::related -.-> Center
click Rel_cryptocurrency_investigations "/terms/cryptocurrency-investigations"
Rel_blockchain_forensics["blockchain-forensics"]:::related -.-> Center
click Rel_blockchain_forensics "/terms/blockchain-forensics"
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classDef pre fill:#0f172a,stroke:#3b82f6,color:#94a3b8,rx:5,ry:5;
classDef child fill:#0f172a,stroke:#10b981,color:#94a3b8,rx:5,ry:5;
classDef related fill:#0f172a,stroke:#8b5cf6,stroke-dasharray: 5 5,color:#94a3b8,rx:5,ry:5;
linkStyle default stroke:#4b5563,stroke-width:2px;
🧒 Explique como se eu tivesse 5 anos
Imagine que alguém liga secretamente uma mangueira no tanque do seu carro para abastecer o gerador deles. Seu carro fica lento e sua conta de gasolina explode. O cryptojacking rouba a potência do seu computador para 'fabricar' dinheiro digital para os hackers.
🤓 Expert Deep Dive
Cryptojackers raramente mineram Bitcoin (exige ASICs). O foco é Monero (XMR), pois seu algoritmo RandomX é otimizado para CPUs padrão. Vetores de infecção: Host (malware), Navegador (WebAssembly como Coinhive) e Cloud-jacking (invasão de infraestrutura AWS/Azure).
❓ Perguntas frequentes
How do I know if my computer has been cryptojacked?
Common symptoms include: the cooling fan constantly running at high speed, the device overheating, the battery draining unusually fast, and the CPU usage sitting at 90-100% even when you aren't running heavy applications.
Why do cryptojackers mine Monero instead of Bitcoin?
Bitcoin requires expensive, specialized hardware (ASICs) to mine profitably. A regular computer CPU cannot mine Bitcoin effectively. Monero uses an algorithm (RandomX) specifically designed to be mined on standard CPUs, making regular computers perfect targets for hackers.
Can cryptojacking happen just by visiting a website?
Yes. This is called 'browser-based' or 'drive-by' cryptojacking. The hacker injects a JavaScript or WebAssembly mining script into a compromised website. While you have the tab open, the script uses your CPU to mine. It stops as soon as you close the browser.