Cryptojacking is the hidden mining of cryptocurrency using the resources of other people’s devices. Let’s take a closer look at how this type of attack works, why it is dangerous, and what measures can help protect against it.
What is cryptojacking
Cybercriminals constantly develop new ways to make money, from fraudulent schemes that use social engineering to the distribution of malicious software. One of the most widespread methods of cybercrime in the cryptocurrency sphere is cryptojacking.
Cryptojacking is the installation of hidden cryptocurrency-mining software on a user’s device. Essentially, it is the “hijacking” of computing power—CPU, GPU, and RAM—without the device owner’s knowledge.
It is important to note that not only desktop computers and laptops are at risk, but also smartphones, tablets, and other mobile devices.
How cryptojacking malware spreads
There are several main channels through which devices can be infected:
Exploitation of vulnerabilities in the operating system, its components, or installed applications;
Phishing websites*, which can run mining scripts directly in the browser, even without installing any programs;
Pirated software downloaded from torrent trackers and dubious resources;
Email and messengers, where attackers disguise malicious files as useful tools;
Malicious advertising often promises “easy money” or free software.
* Phishing websites are fake web resources that deliberately masquerade as legitimate sites through visual and technical copying. Attackers replicate the design, logos, page structure, and domain names of the originals (for example, by substituting letters, adding symbols, or using subdomains). Phishing sites disguise themselves as legitimate services to deceive users, steal data, or covertly perform malicious actions, including launching mining scripts.
Why cryptojacking is dangerous
The consequences of cryptojacking go far beyond simply slowing down a device. Users may face the following problems:
Accelerated wear or failure of the CPU, GPU, and RAM;
increased electricity consumption and, as a result, higher costs;
Higher internet traffic usage and reduced connection speed.
The more powerful the device or corporate network, the more serious the negative consequences can be. In corporate networks, the situation is aggravated by the fact that malware can spread simultaneously to dozens or hundreds of workstations, servers, and virtual machines.
How to detect cryptojacking
There are several signs indicating possible infection:
A sudden drop in device performance for no apparent reason.
frequent freezes, crashes, and unstable operating system behavior;
CPU overheating and increased fan noise, especially on laptops;
The appearance of unknown or suspicious processes in the task manager.
If such symptoms are observed regularly, the device should be checked for hidden miners.
Ways to protect against cryptojacking
Regular software updates
Operating system and application updates often contain fixes for critical vulnerabilities exploited by attackers.
Use of licensed software
Avoiding pirated programs significantly reduces the risk of infection. Saving on licenses can lead to severe financial losses in the future.
System load monitoring
Monitoring tools in Windows, macOS, and Linux enable the identification of processes that consume excessive resources. In complex cases, specialized software may be required.
Antivirus protection
Modern antivirus solutions regularly update their threat databases and can detect cryptojacking software. If infection is suspected, it is recommended to perform a full system scan.
Visiting trusted websites
Preference should be given to verified resources from the top positions in search results. Particular caution should be exercised with advertisements and links from emails and chats.
Refusing to download files from strangers
Files received from unknown users may contain malware and should not be opened without verification.
Anti-phishing tools
Risks can be reduced with the help of:
Crypto wallets with built-in phishing protection (MetaMask, Trust Wallet, Trezor);
Browser extensions such as Netcraft and Bitdefender;
Phishing detection services such as BI.ZONE Digital Risk Protection and Check Point AntiPhishing.
In addition, built-in protection is available in popular browsers: Chrome, Safari, Opera, Mozilla Firefox, and Yandex Browser.
Additional tools
Some specialized extensions and firewalls block mining scripts, such as MinerBlock,No Coin, NoScript, and CryptoMining Blocker.