Is a cryptojacker the same as ransomware?

No. A cryptojacker secretly uses your device to mine cryptocurrency, while ransomware locks your files or device and demands payment. Both can be malicious software, but they take different things from you: cryptojacking steals computing power and electricity; ransomware takes away access to your data and may also steal it.

What each one does to your device

Cryptojacking means using your computer, phone, or server to mine without your informed permission. Mining is the work a computer does to help run a cryptocurrency network and earn rewards. With cryptojacking, someone else gets the rewards while you pay the costs.

You may notice:

• A device that runs hotter or louder than usual.
• Slower apps or a browser that feels sluggish.
• Faster battery drain or higher electricity use.

A cryptojacker usually benefits from staying hidden so it can keep mining.

Ransomware usually encrypts files, which scrambles them so you cannot read them without a special key. Some versions lock your screen or system instead. The attacker then demands money to restore access. They may also threaten to publish stolen files.

Ransomware usually makes its presence obvious once it is ready to demand payment.

Where Monero and browser mining fit in

Monero is a cryptocurrency that you can mine with a CPU—the main processor in your computer. That makes it a possible target for cryptojackers. But Monero mining itself is not ransomware, and it is not automatically cryptojacking.

The important difference is permission:

• If you knowingly choose to mine on your own device, understand the resource use, and can stop, that is voluntary mining.
• If a website or program mines secretly, or keeps going against your wishes, that is unauthorized mining.

Browser mining can be legitimate or abusive. A website saying “this is only mining, not ransomware” does not prove it is safe. You still need clear consent, honest information about resource use, and control over when it runs.

Also, a ransomware demand for Monero does not mean your device is mining Monero. Requesting payment in a cryptocurrency and mining that cryptocurrency are separate activities.

Can you have both at once?

Yes. An attacker can install a miner and ransomware on the same device, either together or at different times. Finding one does not rule out the other.

Symptoms alone are not enough to identify an infection. A hot laptop might be busy with an update, a game, or many browser tabs. A ransom message inside a web page could be a fake scare tactic rather than proof that your files are encrypted.

Do not pay, call a number, or download a “repair tool” just because a warning tells you to.

What you should do

If you suspect browser-based cryptojacking, close the suspicious page. That normally stops code running inside that page, but it does not remove a malicious extension or installed program. Review extensions, update your browser and operating system, and run a scan with trusted security software.

If files suddenly become unreadable or you see a ransom note, disconnect the device from networks and attached backup drives. For a work device, contact your IT team immediately. Otherwise, seek trusted technical help. Paying does not guarantee recovery.

The bottom line

A cryptojacker secretly consumes your device’s resources. Ransomware holds your access or data hostage. Neither is harmless, and an attack can involve both—but they are not the same thing.