What is Cryptojacking and How Does it Work?

In the world of cryptocurrencies, where blockchain technology promises a decentralized and secure future, there exists a dark side that exploits unsuspecting users and their computing power. Cryptojacking, the covert act of using someone else’s computer to mine cryptocurrency, has become a pervasive threat in the digital realm. In this blog post, we will dive deep into what cryptojacking is, how it operates, and what you can do to protect yourself from falling victim to this invisible menace.

What is Cryptojacking?

Cryptojacking, a portmanteau of “cryptocurrency” and “hijacking,” is a cyberattack where malicious actors secretly harness the computational power of other people’s devices to mine cryptocurrencies like Bitcoin, Ethereum, or Monero. Unlike traditional cybercrimes that steal personal information or hold data for ransom, cryptojacking operates in the shadows, often going unnoticed by victims.

How Does Cryptojacking Work?

  1. Infection: The process typically begins with the victim unknowingly encountering a compromised website, a malicious email attachment, or a compromised app. These vectors contain hidden JavaScript code that executes when the victim interacts with them.
  2. Browser-Based Cryptojacking: One common form of cryptojacking involves browser-based attacks. When you visit an infected website, the malicious code runs in your browser, utilizing your computer’s CPU power to mine cryptocurrency. Your computer becomes an unwitting participant in a mining pool, contributing computational resources to the attacker.
  3. File-Based Cryptojacking: Another method is file-based cryptojacking, where malware is downloaded and installed on the victim’s device. Once activated, this malware uses the host computer’s CPU or GPU for mining. This approach can lead to more extensive resource usage and system slowdowns.
  4. Botnets: Some cryptojackers operate as part of a botnet, a network of compromised devices controlled by a single entity. These botnets can be used to launch large-scale cryptojacking campaigns, amplifying the attacker’s mining power.
  5. Masking: To avoid detection, cryptojackers often employ techniques to throttle the mining process when the victim’s device is in use or decrease the CPU usage to fly under the radar. This way, they can continue mining cryptocurrency for an extended period without raising suspicions.

Detecting and Preventing Cryptojacking

Detecting cryptojacking can be challenging, as it operates surreptitiously in the background. However, there are some signs that may indicate your device is being cryptojacked:

  • High CPU or GPU Usage: If your computer suddenly becomes sluggish and the fan is running at full speed, it could be a sign of cryptojacking.
  • Increased Energy Consumption: Cryptojacking can cause your device to use more power than usual, leading to higher energy bills.
  • Browser Extensions: Be cautious about browser extensions, as some may contain hidden mining scripts.

To protect yourself from cryptojacking:

  1. Use Ad-Blockers and Anti-Malware: These tools can help block cryptojacking scripts and malicious websites.
  2. Keep Software Updated: Ensure your operating system, web browsers, and security software are up-to-date to patch vulnerabilities.
  3. Be Cautious: Avoid suspicious websites and be skeptical of unsolicited email attachments or downloads.
  4. Monitor Resource Usage: Regularly check your computer’s resource usage for any anomalies.
  5. Use Browser Extensions: Some browser extensions are designed to block cryptojacking scripts.


Cryptojacking may not steal your personal data, but it’s a stealthy theft of your device’s processing power. By understanding how cryptojacking works and taking steps to protect your devices, you can shield yourself from this increasingly prevalent cyber threat. Stay vigilant, keep your software updated, and browse the internet with caution to ensure a secure digital experience.

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