Miner viruses: What are they and how to remove a miner from your PC

What Are Cryptomining Viruses

A cryptomining virus is a form of malware that stealthily infiltrates computers, smartphones, or other digital devices and hijacks their processing power to mine cryptocurrency. The primary objective of this malware is to launch a covert miner that continuously solves complex mathematical problems to generate cryptocurrency, with all proceeds diverted to cybercriminals.

A parasitic miner drains your device’s electricity and computational resources without your consent or awareness. Unlike ransomware, it doesn’t encrypt files or directly damage data, but it effectively steals your processing capacity, dramatically shortens hardware lifespan, and drives up electricity bills. The CPU and GPU are pushed to their limits, resulting in premature wear and excessive system heat.

Who Creates Malicious Miners and Why

Cybercriminals at various levels of sophistication develop and distribute cryptomining viruses. Sometimes, large hacker groups engineer these attacks to profit financially. In cybersecurity, these incidents are commonly referred to as cryptojacking—the unauthorized exploitation of others’ computing resources to mine cryptocurrency.

Cryptomining viruses are designed for maximum stealth, allowing victims to remain unaware of the infection for long periods. This benefits hackers: unlike ransomware, which immediately reveals itself and demands payment for decryption, miners can operate undetected for months or even years, quietly extracting cryptocurrency. During this time, attackers can generate substantial profits by leveraging vast botnets of compromised devices.

How Infection Occurs

Main Infection Vectors

Downloading infected software is one of the most prevalent infection methods. Miners often pose as pirated programs, cracked games, Windows activators, or key generators. Users seeking to avoid software licensing fees inadvertently install malicious code themselves.

Through dropper viruses—specialized dropper programs initially penetrate the PC as seemingly harmless files, then download and install the miner from the internet. This multi-stage method helps bypass antivirus protection.

Via email and phishing—malicious attachments or phishing links in emails remain an effective distribution mechanism. Attackers disguise messages as business correspondence, bank notifications, or alerts from well-known services.

Exploits and network worms—attackers use vulnerabilities in operating systems and software to spread automatically without user intervention. This is especially dangerous in corporate networks, where a single infected computer can compromise the entire infrastructure.

Through browser scripts—embedding JavaScript miners into web pages. Visiting an infected site triggers the miner directly in the browser, consuming system resources for as long as the page is open.

Mobile Device Infection

Mobile devices are also at risk. Cryptomining viruses exist for Android, and they could theoretically be developed for iOS, though Apple’s closed ecosystem makes their spread much harder. Numerous Android incidents have been documented where hidden miners are embedded in apps, with some even reaching the official Google Play store by masquerading as legitimate software.

Examples of Notable Malicious Miners

CoinMiner is a generic term for a family of mining trojans that infect computers through malicious email attachments. This malware family includes many variants, which attackers continuously modify.

XMRig—originally legitimate Monero mining software, XMRig’s open-source code is frequently abused in malware. Monero is favored by cybercriminals due to its high transaction anonymity.

WannaMine is a particularly dangerous miner that self-propagates via Windows vulnerabilities, leveraging the infamous EternalBlue exploit used by the WannaCry ransomware. It can infect entire corporate networks without user action.

HiddenMiner is a specialized mobile miner for Android that hides its icon after installation and runs in the background, rapidly draining the battery and overheating the device.

Smominru—one of the largest known botnets used for cryptocurrency mining, infecting over 500,000 servers worldwide. This botnet demonstrates the scope of contemporary cyberthreats and the potential profitability for attackers.

How to Tell If Your Device Is Infected with a Miner

Key signs your device is infected with a cryptomining virus:

Performance degradation—the computer noticeably slows during routine tasks, and the smartphone lags even with basic apps. Programs open more slowly, and the system responds sluggishly.

Device overheating—your laptop or phone feels hot even under minimal load, fans run at top speed, and persistent noise occurs. This results from the processor running at full capacity nonstop.

Suspicious programs—unknown processes with strange names appear in Task Manager, consuming significant CPU or GPU resources. Miners often mimic system processes.

Constantly high CPU/GPU usage—processor or graphics card usage remains at 70–100% even when the device is idle.

System lag and stuttering—noticeable delays, mouse cursor freezes, or choppy scrolling. Video playback may also stutter.

Rapid battery drain—laptop or smartphone batteries deplete several times faster than usual, requiring frequent charging.

Antivirus alerts—your antivirus flags threats like Trojan.Miner or Coinminer, or blocks suspicious processes.

Increased network traffic—unusual network activity and continuous data transmission, even when you’re not browsing. Miners send computation results to attacker-controlled servers.

How to Manually Remove a Miner from Your PC

Step-by-Step Manual Removal Guide

Step 1: Disconnect your device from the internet—immediately disable Wi-Fi or unplug the network cable. This stops the miner from transmitting data or downloading more components.

Step 2: Find and terminate the suspicious process—open Task Manager with Ctrl+Shift+Esc, go to the “Processes” tab, and sort by CPU usage. Identify any process with abnormal resource usage and an unfamiliar name, right-click it, and choose “End Task.”

Step 3: Locate the miner’s file—before ending the process, right-click it and select “Open file location.” This reveals the folder with the malicious executable. Make a note of this path.

Step 4: Delete the virus files—navigate to the miner’s folder and remove the executable and all related files. Also check temporary folders and the AppData directory, where miners often store their files.

Step 5: Clean startup and scheduled tasks—inspect Task Manager’s “Startup” tab for suspicious entries and remove them. Open Windows Task Scheduler and delete any miner-related tasks. Check the Windows registry (Win+R, enter regedit) for startup entries.

Step 6: Restart your computer—reboot, reconnect to the internet, and review system status. Open Task Manager again to confirm the suspicious process hasn’t returned.

Step 7: Scan your system with antivirus software—run a thorough scan of all drives to remove remaining malware or hidden threats.

Removal Using Free Tools

Step 1: Use Dr.Web CureIt!

Download the portable Dr.Web CureIt! utility from the official Dr.Web website. This tool requires no installation and can be run immediately after download. Launch the scanner, select all available drives for a comprehensive scan, and click “Start Scan.” After scanning, click “Neutralize” to automatically remove all detected threats.

Step 2: Microsoft Defender

Microsoft Defender, built into Windows (formerly Windows Defender), can effectively detect most cryptominers. Open Windows Security Center from the Start menu, select “Virus & Threat Protection,” and choose “Full Scan.” This scans all files, including archives. Defender will automatically remove or quarantine detected threats.

Step 3: Alternative Antivirus Solutions

If previous tools didn’t resolve the issue, try these free utilities:

Malwarebytes Free—specializes in detecting and removing malware, including miners and adware.

Kaspersky Virus Removal Tool—a free, portable utility from Kaspersky Lab for virus removal.

ESET Online Scanner—a cloud-based scanner that operates without installation and uses up-to-date threat databases.

Zemana AntiMalware Free—a lightweight tool for quickly detecting hidden threats, highly effective against modern miners.

What to Do If the Miner Can’t Be Removed

Run a scan in Safe Mode—restart your computer and boot into Safe Mode, which loads only essential system components. The miner won’t run in this mode, making removal easier.

Try a different antivirus utility—different antivirus products use varied detection techniques. What one misses, another may detect.

Check and remove all startup entries—thoroughly check all possible startup locations: startup folder, Windows registry, Task Scheduler, and system services. Miners often create multiple persistence points.

Seek help on antivirus support forums—security experts on specialized forums can analyze your system logs and offer targeted removal advice for persistent malware.

Ultimate solution—reinstall your operating system—if all else fails, the most reliable fix is to reinstall your OS and format the system drive. Back up important data beforehand.

How to Protect Your Computer from Hidden Miners

Install a reputable antivirus and keep it enabled with real-time protection. Leading antivirus tools can block miners before they execute.

Keep your operating system and software updated—install security updates as soon as they’re released. Most exploits target known vulnerabilities already patched in updates.

Avoid downloading software from untrusted sources—don’t use pirated software, cracked games, or activators. Only download from official developer sites.

Be cautious with email attachments and links—avoid opening attachments or clicking links in emails from unknown senders. Always verify the sender’s authenticity.

Use ad and script blockers in your browser—extensions like uBlock Origin or NoScript help block browser-based miners on web pages.

Monitor your device’s status—regularly check Task Manager for unfamiliar processes, keep an eye on component temperatures, and investigate any abnormal system behavior.

FAQ

What is a cryptomining virus (miner)? How does it infect a computer?

A cryptomining virus is malware that exploits a computer’s resources to mine cryptocurrency without user permission. Infection occurs via malicious applications, phishing emails, exploited vulnerabilities, and malicious website scripts. Common symptoms include high CPU usage, overheating, and sluggish performance.

How can I tell if my computer is infected with a cryptomining virus? What are the symptoms?

Check CPU and GPU usage in Task Manager (Ctrl+Alt+Del). If resource usage is high with no active programs, install antivirus software to remove the malware and monitor your system regularly.

How do I completely remove and clean cryptomining viruses from my computer?

Run a full-system scan with antivirus software, remove detected miner files, clear startup entries, and review system logs. Restart your device and scan again to confirm removal.

Cryptomining viruses: what are they and how to remove a miner from a PC

Cryptomining viruses slow down computers, cause overheating, and damage hardware. They consume CPU resources and electricity, shorten laptop battery life, and can lead to system failure.

How can I prevent my computer from being infected by a cryptomining virus?

Install reputable antivirus software, avoid untrusted download sources, keep your system updated, monitor CPU usage, and steer clear of suspicious links and emails.

How are cryptomining viruses different from regular viruses?

Cryptomining viruses hijack computing resources to mine cryptocurrency, while regular viruses damage systems or demand ransom. Miners operate covertly, consuming power without directly destroying data.