KEY TAKEAWAYS
- Cryptojacking malware hijacks computer processing power to mine cryptocurrency without the device owner’s knowledge, causing measurable hardware degradation and inflated electricity bills.
- SonicWall recorded 1.06 billion cryptojacking hits globally in 2023, representing a 659% increase over the previous year as attackers shifted from browsers to the cloud.
- In its 2021 Threat Horizons report, Google’s Cybersecurity Action Team found that 86% of a sample of 50 compromised Google Cloud instances were used for cryptocurrency mining by unauthorized actors.
- Sysdig research shows victims pay $53 in cloud compute costs for every single dollar of cryptocurrency that the attacker successfully mines through compromised infrastructure.
- Advanced cryptojacking scripts actively monitor for Task Manager and automatically pause mining processes when users open system monitoring tools to avoid detection.
SonicWall detected 1.06 billion cryptojacking incidents in 2023, a 659% surge over the prior year’s 139.3 million, according to the company’s annual threat report.
Cryptojacking is the unauthorized use of someone’s computing resources to mine cryptocurrency. Unlike ransomware, which demands payment immediately, cryptojacking operates silently in the background.
Detection is difficult because modern scripts disguise themselves as legitimate system processes. This article covers the warning signs, detection methods, and removal tools needed to identify whether your computer is mining cryptocurrency without authorization.
CPU and GPU Usage Spikes Without a Clear Cause
The most reliable indicator of cryptojacking is sustained processor usage above 50% during idle periods. Mining malware consumes CPU and GPU cycles to solve cryptographic puzzles, generating measurable load.
Open Task Manager on Windows using Ctrl + Shift + Esc. Monitor the CPU column for five to ten minutes without running other applications. Legitimate background processes rarely sustain usage above 20%.
Watch specifically for processes named xmrig.exe or coinminer, which are common mining executables. Some scripts disguise themselves using legitimate-sounding names like svchost.exe or lsass.exe, according to GoMining’s detection guide.
Some advanced cryptojacking malware monitors for Task Manager or similar system-monitoring tools and temporarily pauses mining activity when they are opened, making detection more difficult.
Microsoft Process Explorer reveals hidden processes that the standard Task Manager cannot display. Run it alongside normal monitoring to catch scripts that pause during detection attempts. On macOS, open Activity Monitor and sort by CPU percentage. Mining malware will typically appear as an unnamed or generically labelled process consuming resources continuously.
Overheating, Fan Noise, and Accelerated Battery Drain
Cryptojacking forces hardware to operate at sustained high loads, generating excess heat. Laptop and desktop cooling fans running at maximum speed during light tasks signal unauthorized computer activity.
Battery drain accelerates measurably on affected laptops. Devices losing charge at twice the normal rate during standby mode should be investigated, according to Bitdefender’s research.
Prolonged high-temperature operation degrades CPU thermal paste and can permanently reduce component lifespan. Users who notice consistently elevated temperatures should check for unauthorized mining processes.
Sysdig researcher Stefano Chierici documented the economic asymmetry of these attacks. Victims pay $53 in cloud compute costs for every $1 of cryptocurrency the attacker mines, according to Sysdig’s analysis.
The TeamTNT operation illustrated this ratio at scale, and that campaign generated $8,100 in Monero for attackers while costing victims more than $430,000 in inflated cloud computing bills. Electricity bills can also spike noticeably for desktop users, and mining hardware draws sustained power loads that exceed normal consumption patterns for standard office computing tasks.
Browser-Based Mining Scripts and Network-Level Detection
Browser-based cryptojacking injects JavaScript mining code into web pages. Chrome users can press Shift + Esc to open the browser task manager and identify which tabs consume excessive resources.
Google’s Cybersecurity Action Team reported in its 2021 Threat Horizons report that 86% of a sample of 50 compromised Google Cloud instances were used for cryptocurrency mining. The finding illustrates how attackers frequently monetize compromised cloud infrastructure through mining operations alongside attacks on individual endpoints.
More than 3,500 websites have been found running hidden Monero mining scripts, according to Cryptopolitan’s reporting. Visitors to these sites unknowingly donate processing power while browsing.
Install browser extensions such as AdBlock Plus with the NoCoin blocklist to prevent mining scripts from executing. This blocks known cryptojacking domains before they can initiate mining code.
Network monitoring tools can detect cryptojacking by identifying connections to known mining pool addresses. Unusual outbound traffic to ports commonly used by mining protocols warrants further investigation.
For removal, Malwarebytes and Bitdefender both offer free scanning tools that detect and remove cryptojacking malware. Kaspersky Virus Removal Tool (KVRT) provides an on-demand malware scanner, while Kaspersky Rescue Disk is the bootable recovery tool designed to detect rootkit-level infections that standard scanners may miss.
What’s Next?
Cryptojacking attacks shifted from browser scripts to cloud workloads between 2024 and 2026. Public administration and healthcare sectors each accounted for 24% of all Cisco Talos incident-response engagements in Q1 2026, according to the company’s quarterly report.
As cloud computing adoption expands, organizations must implement runtime container monitoring and anomaly-based detection. Individual users should maintain updated antivirus software and monitor CPU usage patterns regularly.
FAQs
What is cryptojacking, and how does it differ from ransomware attacks?
Cryptojacking secretly uses your computer’s processing power to mine cryptocurrency without consent, while ransomware encrypts files and demands payment before restoring access to data.
Which cryptocurrency do most cryptojacking scripts mine on infected machines?
Most cryptojacking malware mines Monero because its CryptoNight algorithm runs efficiently on standard CPUs without requiring specialized graphics cards or ASIC mining hardware.
Can cryptojacking permanently damage computer hardware over extended periods?
Sustained high-temperature operation from cryptojacking degrades thermal paste and stresses CPU components, potentially shortening hardware lifespan and causing permanent performance reduction over time.
How can I check if my browser is running hidden mining scripts?
Press Shift plus Esc in Chrome to open the browser task manager, then identify any tabs consuming abnormally high CPU resources compared with normal browsing activity.
Does antivirus software reliably detect all cryptojacking malware threats?
Standard antivirus catches known cryptojacking signatures, but advanced scripts that mimic legitimate processes may require specialized tools like Microsoft Process Explorer or Kaspersky rescue disks.
How much does cryptojacking cost victims in electricity and cloud bills?
Sysdig research found that victims pay $53 in compute costs for every $1 of cryptocurrency mined, with the TeamTNT campaign costing victims over $430,000 total.
What sectors accounted for the largest share of Cisco Talos incident-response engagements in Q1 2026?
Cisco Talos reported that public administration and healthcare each represented 24% of all incident-response engagements during the first quarter of 2026. The report does not provide a sector-by-sector breakdown specifically for cryptojacking incidents.
References
- SonicWall 2024 Annual Cyber Threat Report: Cryptojacking Soars (SonicWall, published 2024, covering 2023 threat activity).
- Cryptojacking Statistics 2026: 80+ Cloud, Cost, and Threat Numbers (CoinLaw, 2026)
- Top 5 Signs Someone Is Mining Crypto on Your PC (GoMining, 2026)
- Is Your PC Infected with a Crypto Miner? Here’s How to Find Out (Bitdefender)
