Cryptojacking is one of the more deceptive cyber threats out there. Unlike ransomware or phishing, it doesn’t steal your data or hold your files hostage. Instead, it hijacks your device’s computing power to secretly mine cryptocurrency for someone else’s benefit — all while slowing down your system and draining your resources.
The good news? With a few smart habits and the right tools, cryptojacking is entirely preventable. Here are some practical ways to keep your devices safe from being exploited:
1. Use Trusted Security Software
Your first line of defence should be quality security software. A trusted program will scan for and block cryptojacking scripts before they run. Many also monitor your device’s performance and will alert you if something is draining your CPU power in the background.
If you’re using a work-issued device, these protections may already be handled by your IT provider. Still, it’s worth checking in to ensure you're fully covered or to explore if additional layers of protection can be added.
2. Be Cautious with Downloads
One of the easiest ways cryptojacking malware ends up on devices is through risky downloads. Avoid:
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Pirated software
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Unknown email attachments
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Suspicious browser extensions
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Pop-ups prompting you to download a “missing plug-in” or urgent security patch
Stick to reputable sources for software and always double-check the legitimacy of browser add-ons before installing.
3. Strengthen Cloud and IoT Security
Cryptojackers often target cloud services and Internet of Things (IoT) devices, which tend to have weaker security settings by default.
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Use strong, unique passwords for all devices
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Enable multifactor authentication (MFA) wherever possible
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Review default settings and disable unnecessary remote access
Taking these steps can help prevent criminals from hijacking the processing power of your smart devices and cloud accounts.
4. Monitor System Performance
One of the tell-tale signs of cryptojacking is a sudden spike in CPU usage. If your device feels slower than usual, overheats, or the fan kicks into overdrive without a clear reason, it's worth checking your system stats.
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Windows: Press
Ctrl + Shift + Escto open Task Manager. Under the Performance tab, check CPU usage. -
Mac: Open Activity Monitor from the Utilities folder to view system performance.
If CPU usage is high and you don’t have any demanding programs running, something suspicious might be operating in the background.
5. Report and Respond
If you suspect cryptojacking—especially on a work device—don’t try to resolve it on your own. Report it to your IT department immediately. Early detection can prevent wider issues across the network.
For businesses, it’s wise to:
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Block known cryptojacking sites using web filters
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Monitor the network for unusual spikes in CPU usage
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Limit which browser extensions employees can install
Stay Proactive
Cryptojacking may be silent, but it’s not harmless. It can shorten the lifespan of your devices, raise electricity bills, and sap productivity. Fortunately, with a layered approach—security tools, smart browsing habits, and ongoing monitoring—you can stop this threat before it starts.
Stay aware. Stay protected. And don’t let your devices work overtime for a cybercriminal’s payday.
