# What is Cryptojacking? Definition, Detection & Protection Source: https://keepnetlabs.com/blog/what-is-cryptojacking-definition-detection-and-protection Published: 2025-06-13 Updated: 2026-10-04 Author: Ozan Ucar, Founder and CEO of Keepnet Category: Social Engineering > Understand the risks of cryptojacking, a hidden cyber threat that hijacks your CPU for unauthorized crypto mining. Learn its definition, key warning signs, and proven protection strategies to safeguard your systems and prevent performance and energy losses. In 2025, cybercriminals have already stolen over $**2.1 billion in cryptocurrency-related attacks**, with the majority of losses stemming from **wallet compromises** and **phishing campaigns** ([FBI Internet Crime Complaint Center report](https://www.ic3.gov/PSA/2024/PSA240801)). While these high-profile breaches dominate headlines, a more insidious threat operates silently in the background: **cryptojacking**. **Cryptojacking** involves unauthorized use of a device's computing power to mine cryptocurrency, often without the user's knowledge. This covert activity can lead to degraded system performance, increased electricity costs, and accelerated hardware wear, posing significant risks to both individuals and organizations. Learn more: [What Is Phishing How To Protect Yourself From It](https://keepnetlabs.com/blog/what-is-phishing-how-to-protect-yourself-from-it). In this blog, we'll delve into the **definition of cryptojacking**, explore how it operates, identify signs of infection, and provide actionable strategies to detect and prevent it. We'll also highlight how [Keepnet’s secure behaviour management platform](https://keepnetlabs.com/) can fortify your organization's defenses against this escalating threat. ## What is Cryptojacking? **Cryptojacking** is a cyberattack where malicious actors secretly use your device’s CPU or GPU to mine cryptocurrency without your knowledge or consent. Instead of stealing sensitive data or encrypting files, attackers focus on exploiting computing resources to generate digital coins such as Monero. This type of attack usually starts through phishing emails, compromised websites, or software embedded with hidden cryptomining scripts. Once the code is triggered, it runs quietly in the background, reducing system performance, increasing electricity consumption, and causing hardware to wear out faster. Since the attack does not trigger obvious alerts, it can continue undetected for long periods, making it an attractive and profitable method for cybercriminals. Companies handling high-value digital transactions, particularly in the cryptocurrency sector and those seeking [consulting services for VARA license application](https://www.acxcompliance.com/service/vara-licensing-support), need to stay alert to such threats. ### Cryptojacking Definition **Cryptojacking** is the covert use of a device’s computing power to mine cryptocurrency for a cybercriminal’s benefit. It functions silently, often through hidden scripts or malicious software, turning unsuspecting users into unknowing participants in illicit cryptomining operations. ## How Does Cryptojacking Work? **Cryptojacking**works by embedding malicious cryptomining scripts into websites, emails, or software applications that silently activate once they’re loaded onto a device. When triggered, these scripts hijack the CPU or GPU, using the victim’s processing power to mine cryptocurrency, commonly Monero due to its privacy-focused design. Attackers typically deliver the code through: - [Phishing emails](https://keepnetlabs.com/products/phishing-simulator) with infected links or attachments - Compromised websites or online ads (also known as drive-by mining) - Malicious browser extensions or third-party plugins Once active, the script operates quietly in the background, draining system resources while staying under detection thresholds by throttling CPU usage. Advanced cryptojacking malware may even spread across internal networks, infecting other devices to amplify mining output. The entire process generates profit for the attacker while the victim suffers from sluggish system performance, higher electricity bills, and increased hardware wear, making **cryptojacking** a hidden but impactful cybersecurity threat. ### The Attack Lifecycle ![Cryptojacking Attack Lifecycle](https://timely-benefit-e63d540317.media.strapiapp.com/Cryptojacking_Attack_Lifecycle_ed84467540.png) *Picture 1: Cryptojacking Attack Lifecycle* The **cryptojacking attack lifecycle** typically unfolds in three main stages: - **Delivery**: The attacker injects cryptomining code through phishing emails, compromised websites, online advertisements, or malicious browser extensions. The payload is usually JavaScript-based or hidden within malware-laced downloads. - **Execution**: When the victim interacts with the malicious content - by clicking a link, opening an attachment, or visiting an infected page - the cryptojacking script activates silently. It begins utilizing the device’s CPU or GPU to mine cryptocurrency without any visible symptoms. - **Persistence**: To remain active, attackers apply stealth tactics such as code obfuscation, fileless execution, or persistent browser activity. In some cases, the script can laterally move within a network, infecting other connected devices to scale the mining operation. This quiet, continuous cycle enables cryptojacking to evade detection for extended periods, allowing attackers to reap financial rewards while gradually degrading system performance and increasing operational costs. ### HJINX-0132: Cryptojacking via DevOps Exploits In 2025, a **cryptojacking campaign** named **JINX-0132** was discovered targeting internet-exposed DevOps systems like Docker, Gitea, and HashiCorp Nomad. The attackers searched for systems that were poorly configured or left unprotected, then injected cryptomining scripts to secretly mine cryptocurrency. Instead of creating their own tools, the attackers downloaded publicly available cryptomining software from GitHub. This made the attacks harder to trace and easier to launch. They used these tools to run the **XMRig miner**, a popular program for mining Monero. What made this campaign especially dangerous was its ability to take over systems that controlled hundreds of connected machines. By doing so, the attackers gained access to massive computing power - enough to cost tens of thousands of dollars per month if rented legally. ([Thehackernews report](https://thehackernews.com/2025/06/cryptojacking-campaign-exploits-devops.html)) This case highlights how cryptojackers can exploit weakly secured systems to run large-scale mining operations, putting organizations at risk of high operational costs and reduced system performance. ## Common Symptoms and Detection Techniques While **cryptojacking** is designed to stay hidden, it often leaves behind noticeable signs. Identifying these symptoms early can help stop unauthorized cryptomining before it impacts system performance, increases electricity costs, or causes long-term hardware issues. The table below highlights common indicators that a device may be affected by cryptojacking. **Table 1: Common Symptoms of Cryptojacking** | Symptom | Description | | ------------------------ | ----------------------------------------------------------------------------------- | | Slow System Performance | Devices become laggy or unresponsive without any heavy software running. | | Overheating | Fans run continuously or systems feel unusually hot due to hidden processing loads. | | High CPU/GPU Usage | Task managers reveal elevated resource usage linked to unknown background tasks | | Battery Drains Quickly | Mobile devices and laptops lose battery power much faster than normal. | | Unexpected Energy Bills | Spikes in electricity costs may signal excessive background processing. | | Strange Browser Behavior | Browsers remain active when closed or show CPU spikes on certain websites. | ### Detection Techniques ![Cryptojacking Detection Tools](https://timely-benefit-e63d540317.media.strapiapp.com/Cryptojacking_Detection_Tools_014490b3ae.png) *Picture 2: Cryptojacking Detection Tools* To detect **cryptojacking activity**, use a mix of manual inspections and automated tools to identify unusual behavior and block threats early: - **System Monitors**: Check Task Manager (Windows) or Activity Monitor (Mac) for high CPU or GPU usage caused by unknown background processes. - **Network Analysis**: Monitor for unusual outbound traffic or connections to known cryptocurrency mining pools. - **EDR Solutions**: Endpoint Detection and Response tools can identify, trace, and neutralize hidden cryptomining scripts across your network. - **Browser Extensions**: Install script-blocking tools like NoCoin or minerBlock to prevent mining scripts from executing during web browsing. - [Security Awareness Training](https://keepnetlabs.com/products/security-awareness-training): Teach employees to recognize overheating devices, unexpected slowdowns, or browser anomalies, early user reporting can help stop attacks quickly. Spotting these signals early can help reduce system strain, protect your infrastructure, and avoid hidden financial losses from cryptojacking. ## Protection Against Cryptojacking Defending against **cryptojacking** requires a layered approach that includes system hardening, proactive monitoring, and employee awareness. - **Keep systems updated**: Patch operating systems, browsers, and software to close vulnerabilities used by mining scripts. - **Remove unnecessary extensions**: Disable or uninstall unused browser add-ons that could serve as entry points. - **Use browser protections**: Install tools like NoCoin or minerBlock to block cryptomining scripts online. - **Deploy ad blockers**: Prevent malicious ads from launching mining code in the background. - **Block mining domains**: Use DNS filters or firewalls to deny access to known cryptomining servers. - **Implement EDR**: Detect and stop hidden mining processes and fileless malware using Endpoint Detection and Response tools. - **Monitor network traffic**: Look for unusual bandwidth usage or connections to mining pools. - **Run anti-cryptomining tools**: Use updated antivirus software capable of spotting cryptojacking behaviors. - **Train your employees**: Provide [Security Awareness Training](https://keepnetlabs.com/products/security-awareness-training) to help staff spot phishing and unusual device behavior. - **Use** [Phishing Simulators](https://keepnetlabs.com/products/phishing-simulator): Test employee readiness with simulated phishing linked to cryptojacking scenarios. These steps help reduce **cryptojacking risks** and keep your systems running securely and efficiently. Failing to address cryptojacking can quietly drain your business resources and expose deeper security flaws. Although the attack often operates in the background, its consequences can be severe. The table below outlines the main risks organizations face when cryptojacking goes undetected. **Table 2: Key Business Risks of Cryptojacking** | Risk Area | Impact Description | | ----------------- | ---------------------------------------------------------------------------------------- | | Operational Costs | Higher electricity usage and accelerated hardware wear increase overall IT expenses. | | Productivity Loss | Sluggish systems reduce employee efficiency and delay routine operations. | | Security Gaps | Cryptojacking may signal deeper issues like weak system configurations or phishing gaps. | | Compliance Risks | Hidden mining scripts can lead to violations of cybersecurity and data protection laws. | | Reputation Damage | Ongoing infections can reduce customer confidence and tarnish brand credibility. | Treating cryptojacking as a minor issue is a risky oversight. Without timely detection and mitigation, it can escalate into a long-term threat that impacts both your operations and your reputation. ## How Keepnet Helps Protect Against Cryptojacking Keepnet delivers full-spectrum defense against cryptojacking by combining employee training, realistic threat simulations, and automated incident response: - [Security Awareness Training](https://keepnetlabs.com/products/security-awareness-training) equips employees with the skills to recognize cryptojacking tactics, phishing attempts, and suspicious system behavior through interactive modules and real-life simulations. - [Phishing Simulator](https://keepnetlabs.com/products/phishing-simulator) replicates the most current cryptojacking and phishing attack vectors using 22,000+ realistic templates, helping to identify vulnerable users and trigger targeted micro-trainings. - [Incident Responder](https://keepnetlabs.com/products/incident-responder) detects and mitigates email-based cryptojacking threats significantly faster using automated workflows and integrated threat intelligence. With Keepnet, organizations can detect early warning signs, close human risk gaps, and stop cryptojacking attacks before they cause financial or operational damage. Start strengthening your defenses today with [Keepnet’s Free Phishing Simulation Test](https://keepnetlabs.com/products/phishing-simulator) to uncover hidden risks and build a security-first culture. ***Editor's Note: This article was updated on March 12, 2026***. Video: ## What This Means for Teams in 2026 Cryptojacking? Definition, Detection & Protection is most useful when it helps teams make better day-to-day decisions. The strongest content does more than explain a concept. It shows where risk appears in real work, which actions matter first, and how teams can reduce confusion when the pressure is high. That is why practical structure matters. A short explanation, a clear response path, and a few repeatable habits usually create more value than broad advice that looks complete but is hard to use. Keepnet teams usually see stronger results when content like this is tied to a clear workflow, owner, and reporting path. A common mistake is treating cryptojacking? definition, detection & protection as background knowledge instead of a decision that shows up in real operations. ### Keepnet Recommendation - Translate the concept into a small set of practical decisions users can apply quickly. - Focus on the workflows where the issue creates the most business exposure. - Add reporting and escalation guidance so people know what to do under pressure. - Review the content regularly so examples and priorities stay current. ## Frequently Asked Questions ### What is cryptojacking? Cryptojacking is the unauthorised use of someone else's computer, server or cloud account to mine cryptocurrency. Nothing is stolen or encrypted, the attacker simply consumes processing power and electricity while staying quiet for as long as possible. ### How does cryptojacking work? The attacker gets mining code onto a machine through a phishing link, a compromised website or an exposed service, then runs it in the background. Cloud and DevOps environments are attractive because they scale on demand and the cost appears on a bill rather than on a screen. ### What are the symptoms of cryptojacking? Sustained high processor usage with no obvious cause, machines running hot and slow, fans at full speed, batteries draining quickly, and unexplained increases in cloud compute spend. ### How do you detect cryptojacking? Baseline normal resource usage and alert on sustained deviation, monitor outbound connections to known mining pools, and review billing anomalies in cloud accounts. Browser based miners stop when the tab closes, which is a useful diagnostic. ### Is cryptojacking dangerous if nothing is stolen? Yes. The access used to install a miner is the same access that can deliver ransomware or data theft later. A cryptojacking finding is evidence of an unresolved intrusion path, not just a performance problem. ### How can employees help prevent it? Most infections start with a click, so reporting suspicious links and attachments matters more than any single endpoint setting. Exploited vulnerabilities were the leading initial access route in the 2026 Data Breach Investigations Report at 31% (Verizon, 2026, p. 15), so patching and reporting work together.