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

What Are Miner Viruses?

A miner virus is a type of malware that covertly infiltrates a computer, smartphone, or other device and harnesses its computing power to mine cryptocurrency. In essence, this program turns your device into a crypto-mining “farm” without your awareness or consent. All profits generated go to the cybercriminals responsible for the malware, not to the device’s legitimate owner.

Miner viruses pose a significant threat across a broad spectrum of devices, infecting standard PCs, laptops, Android and iOS mobile phones, as well as corporate servers and networking equipment. Their versatility makes them particularly dangerous in today’s digital landscape.

The primary objective of this malware is to deploy a hidden miner in your system, which continuously solves complex mathematical problems to generate cryptocurrency. Mining demands substantial computational resources, so miner viruses typically operate in the background without obvious windows, notifications, or other signs. However, their activity places enormous strain on the CPU—and often the GPU.

As a result, devices infected with miner viruses begin to lag during everyday tasks and can overheat even under minimal load. Prolonged operation at maximum capacity accelerates component wear and can cause premature hardware failure. Cooling systems, processors, and graphics cards are particularly vulnerable, potentially resulting in costly repairs or equipment replacement.

Who Creates Malicious Miners and Why?

Miner viruses are developed and distributed by cybercriminals operating at varying levels of sophistication. Both individual hackers and organized criminal groups with extensive technical resources and expertise orchestrate these attacks. Their core motivation is financial gain with minimal risk and investment.

By mining cryptocurrency through infected devices, cybercriminals generate steady income while leveraging others’ computers and smartphones to avoid the costs of expensive hardware and electricity. The victims bear all the expenses—typically without any awareness of the situation.

Within the industry, such attacks are commonly referred to as cryptojacking (from the English cryptojacking, or “cryptocurrency hijacking”). This form of cybercrime surged in popularity in the late 2010s when Bitcoin and other cryptocurrencies soared in value, making illegal mining even more profitable.

Miner viruses are engineered for stealth, allowing victims’ devices to remain compromised for long periods without detection. This stealth factor makes them highly profitable for hackers: unlike ransomware, which immediately reveals itself by locking files and demanding payment, miners can operate undetected for months or years. The longer the virus stays active, the greater the attackers’ profit.

How Infection Occurs and Can Phones Be Infected?

Malicious miners do not typically self-install—they require an attacker or a dedicated dropper program to gain access. Several primary infection methods exist, each exploiting user behaviors or technical vulnerabilities.

Downloading Infected Software

One of the most widespread infection vectors is downloading compromised software. Miner viruses are often disguised as pirated versions of popular apps or games, Windows OS activators, cracked software, and similar files. Users seeking to save money on licensed products may download such files from torrents or third-party sites; upon launching the installer, a hidden miner is invisibly installed and begins mining immediately.

Via Dedicated Dropper Viruses

Attackers frequently employ more sophisticated infection chains using droppers—small malware programs that penetrate computers first (often through software vulnerabilities or bundled with other software) and then download the miner and additional malicious components from the internet. This method can bypass some security systems since droppers are small and less likely to be flagged by antivirus software.

Via Email and Phishing

A classic yet still effective method: receiving emails with infected attachments. These may be Word documents with malicious macros, ZIP or RAR archives, or executable programs disguised as documents. Messages typically contain persuasive text urging you to open the attachment—such as a supposed notice from a bank, tax authority, or online store. Opening the file and enabling macros or running the program activates a script that downloads and installs the miner virus.

Exploits and Network Worms

Some advanced miners can self-propagate by exploiting vulnerabilities in operating systems or network protocols. A prime example is WannaMine, which leverages exploits targeting various Windows versions and can automatically spread across local networks without user intervention. Such viruses pose extreme risks in corporate environments, where they can infect dozens or hundreds of machines within hours.

Via Browser Scripts (Cryptojacking)

Mining may also occur directly in your browser when visiting certain sites. Cybercriminals embed specialized JavaScript miners on web pages—while you remain on the site, your browser mines cryptocurrency for them. This method requires no software installation but can significantly slow down browser performance and overheat your device. Mining typically stops once you leave the infected page.

Can Smartphones Be Infected by Miners?

Yes—mobile devices are also vulnerable to miner virus infection. Malicious mining apps exist for Android and, in theory, iOS (though infections on iPhones are rare due to the closed ecosystem and strict App Store controls). The risk is greater for Android devices due to the platform’s openness and the ability to install apps from unverified sources.

The most common scenario for mobile infection is downloading and launching a suspicious file from an untrusted source. This could be a pirated app, email attachment, fake update, or popular app. After installation, the hidden miner uses the smartphone’s resources for cryptocurrency mining, leading to rapid battery drain, overheating, and reduced performance.

Examples of Notable Malicious Miners

CoinMiner. This term refers to a broad family of miner trojans prevalent on the web. They usually infect PCs via malicious email attachments, phishing websites, or files distributed through file-sharing networks and torrents. CoinMiner can mine various cryptocurrencies and is regularly updated by attackers to evade antivirus detection.

XMRig. A popular open-source mining tool for Monero that attackers stealthily deploy on compromised devices. XMRig itself is a legitimate miner, but cybercriminals frequently modify and wrap it in malware to abuse third-party computing resources. Monero is favored for its high transaction anonymity.

WannaMine. An exceptionally dangerous miner virus named in reference to the infamous ransomware WannaCry. It is capable of self-replication by exploiting Windows vulnerabilities (notably EternalBlue), automatically infecting other computers on local networks. WannaMine is especially damaging in enterprise environments where it can rapidly proliferate.

HiddenMiner. A specialized mobile miner targeting Android devices, concealed within seemingly harmless apps. Once installed, it covertly initiates intensive mining, causing the device to overheat and potentially physically damage the battery—even leading to swelling or total device failure. HiddenMiner has been known to completely disable mobile devices.

Smominru. One of the largest and most successful known mining botnets. At its peak, Smominru infected over 500,000 Windows servers worldwide, enabling operators to mine vast amounts of Monero. The botnet used diverse infection vectors, including exploits and brute-force attacks against weak passwords.

How Much Can Criminals Earn from Miners?

While each infected PC or smartphone yields only modest profits (ranging from a few cents to several dollars per day depending on device power), mass infections of thousands or tens of thousands of devices generate substantial sums. Cybercriminals assemble vast botnets of compromised machines that operate for them nonstop.

• By 2018, cybersecurity analysts estimated that about 5% of all Monero in circulation was mined illegally through malicious mining on compromised devices. At the time, this equated to approximately $175 million—a staggering figure illustrating the scale of the issue.

• Information security professionals calculated that botnets deploying miner viruses enabled cybercriminals to earn over $7 million in just the second half of 2017. This is a conservative figure; actual earnings may be even higher.

• The Smominru botnet, according to analysts, generated tens of thousands to hundreds of thousands of dollars monthly for its operators during peak activity. Botnet operators incurred virtually no hardware or electricity costs, as they exploited others’ resources.

These figures demonstrate why miner viruses remain highly attractive to cybercriminals—and why their proliferation continues despite ongoing cybersecurity efforts.

How to Tell If Your Device Is Infected with a Miner

Miner viruses are designed for stealth, masking their presence within a system, but they still produce several characteristic indirect signs. Recognizing these symptoms can help you detect infections early and take action.

1. Reduced Performance

If your computer suddenly begins lagging during everyday tasks that previously ran smoothly, or your smartphone stutters in basic apps like browsers or messengers, take notice. Applications open slowly, window switching lags, and the system becomes generally sluggish.

2. Significant Overheating

A clear warning sign—devices infected with miners overheat for no apparent reason. Laptops or desktop cases may feel hot to the touch, even when not running resource-intensive programs or games. Smartphones can become uncomfortably warm even when idle. Computer fans may run at high speed, producing loud noise, which previously occurred only during demanding tasks.

3. Suspicious Programs Running

Windows Task Manager or other system monitors may reveal suspicious activity by unknown processes. You may notice programs with random or system-like names that you did not launch, consuming major system resources—especially CPU time.

4. Persistently High CPU/GPU Load

Even at idle (with no heavy tasks or games running), your computer may show processor or graphics card usage between 70–100%. This strongly indicates that a background process is consuming computational resources.

Key detail: resource usage may spike or vanish when you attempt to monitor it. Advanced miners are programmed to pause or reduce activity when system monitoring tools are opened, making detection more difficult.

5. System Lag and Freezes

The system responds slowly to user actions, programs take longer to open, and video playback may stutter or stop. If you play games, you may notice freezing, sudden FPS drops, and lag—even though performance was previously smooth.

6. Rapid Battery Drain

If your computer’s fans run at maximum, or your phone heats up and its battery drains far faster than normal—even with minimal use and no power-hungry apps—hidden mining may be the cause. Miner viruses consume heavy amounts of energy, directly impacting battery life.

7. Antivirus Warnings

If your antivirus starts issuing alerts for threats named Trojan.Miner, CoinMiner, BitcoinMiner, or blocks processes and files containing “coin,” “miner,” or “crypto,” this is a direct indication of a miner virus infection or attempted infection.

8. Increased Network Traffic or Suspicious Activity

You might spot unusual network connections in firewall settings or a noticeable surge in outgoing internet traffic for no clear reason. Miners regularly send mined results to attacker servers and receive new instructions, creating constant traffic.

The presence of multiple symptoms increases the likelihood of a hidden miner infection. If you observe even a few of these signs, immediately check your system and take steps to remove the malware.

How to Remove a Miner

Manual Removal of a Miner from PC

Step-by-step guide for manually removing a miner from your computer:

1. Disconnect from the internet. This is the first and most critical step if you suspect a miner virus. Disconnecting prevents the virus from communicating with command servers and halts further spread to other network devices. Disable Wi-Fi or unplug the network cable—keep your PC offline until the cleaning process is complete.

2. Identify and terminate suspicious processes. Open Windows Task Manager (Ctrl+Shift+Esc) and go to the “Processes” tab. Examine the list for processes causing high CPU or GPU load, focusing on those with suspicious or random names. If you find one, select it and click “End Task” in the bottom-right corner.

3. Locate the miner file. In Task Manager, right-click the suspicious process and select “Open file location.” This reveals the folder containing the executable .exe file. Record the file path.

4. Delete virus files. Once located, delete the miner file and any related suspicious files in the same folder. Select and press Delete or Shift+Delete for permanent removal. If Windows blocks deletion, restart in Safe Mode (F8 during boot) and remove the file there.

5. Clean up startup and scheduled tasks. Miner viruses often add themselves to system startup. Check the startup list in Task Manager’s “Startup” tab and disable any unknown entries. Also, open Windows Task Scheduler and delete any suspicious tasks that may restart the miner.

6. Restart and verify system status. After completing the steps, reconnect to the internet and reboot normally. Monitor for fan noise, background CPU load, or reappearance of suspicious processes. If the system seems clean, the virus has likely been removed.

7. Scan with antivirus software. Even after manual cleaning, always run a full system scan with reputable antivirus software to detect any remaining virus files, registry traces, or hidden components.

Remove Miner Virus Using Free Tools

Step 1. Use Dr.Web CureIt! antivirus scanner. One of the most effective free solutions is Dr.Web CureIt!, a powerful antivirus scanner that does not require installation and is free for home use.

Download the latest version from the official Dr.Web website. Close unnecessary apps for optimal scanning, then run the downloaded file. In the main window, select “Choose objects to scan” and mark all local disks and partitions for a comprehensive scan. Start the scan and wait until it completes—this may take 30 minutes to several hours, depending on your data volume.

After scanning, review the detailed list of detected threats and click “Neutralize” (or “Delete”) for all threats found, especially those related to miners.

Step 2. Scan with Microsoft Defender. For added assurance, run another antivirus scan. Windows 10 and 11 include Microsoft Defender—an effective, built-in antivirus.

Open Windows Security Center (shield icon in the tray) → go to “Virus & threat protection” → click “Scan options.” Choose Full scan (important, as quick scans may miss hidden files) and begin. Full scans take time but check all system areas.

Step 3. Alternative free antivirus utilities. If previous steps aren’t suitable or successful, try other reputable free tools: Malwarebytes Free (excellent for malware detection), Kaspersky Virus Removal Tool (free), ESET Online Scanner (online, no installation), and Zemana AntiMalware Free (specializes in hidden threats).

What If the Miner Can’t Be Removed?

Miner viruses sometimes use advanced self-defense mechanisms, making standard removal methods ineffective. Try these approaches:

• Scan in Safe Mode. Reboot and press F8 (or Shift+F8) to access the boot menu, then select “Safe Mode with Networking.” This loads only essential drivers and services, disabling many viruses and simplifying removal.

• Try different antivirus utilities. Different products use unique detection algorithms; what one misses, another may catch.

• Check for lingering autorun entries. Even after deleting miner files, registry or Task Scheduler entries may attempt to redownload the virus.

• Consult specialized support forums. Visit official antivirus forums (Dr.Web, Kaspersky, ESET, etc.) for expert help with complex infections.

• Last resort—complete OS reinstall. If all else fails, a clean reinstall of Windows, Android, or another OS with disk formatting is the only guaranteed solution. While time-consuming, this will eradicate the infection.

How to Protect Your Computer from Hidden Miners

Preventive measures are always safer and more cost-effective than remediation. Following these basic cybersecurity practices will dramatically reduce your risk:

• Install reliable antivirus software and keep it active. Modern antivirus programs with current databases will block most miner viruses early. Don’t skip antivirus protection.

• Regularly update your OS and installed applications. Apply security updates for Windows, Android, macOS, and all apps as soon as they’re available. Many viruses exploit outdated software vulnerabilities.

• Avoid downloading software from unverified sources. Use official app stores (Microsoft Store, App Store, Google Play) and developers’ sites. Steer clear of pirated software, cracks, and activators—they often carry miner viruses.

• Be wary of suspicious emails and links. Never open attachments from unknown senders, even if they seem important. Avoid clicking suspicious links in emails, texts, or messenger apps. If unsure, contact the sender via another channel.

• Use ad and script blockers in your browser. This will help prevent web-based mining (browser cryptojacking). Recommended extensions include uBlock Origin, AdBlock Plus, and NoScript (for advanced users).

• Monitor device health regularly. Periodically review Task Manager for suspicious processes and monitor CPU/GPU temperatures with diagnostic utilities. If you notice anything unusual, promptly investigate and clean your system.

FAQ

What are miner viruses and how do they work?

Miner viruses are malware that secretly exploit your computer’s CPU and GPU to mine cryptocurrency without your consent. They slow system performance and increase energy consumption, spreading via email attachments, fake websites, and software vulnerabilities.

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

Typical signs include persistent freezing and sluggish performance, high CPU usage (up to 100%) with no active apps, increased processor temperature, and loud fan operation.

How do I fully remove and clean a miner virus from my computer?

End suspicious processes in Task Manager, then run a comprehensive scan with reputable antivirus software. After removal, check system settings and startup entries for leftover traces.

Miner viruses: what are they, and how do I remove a miner from my PC?

Miner viruses drain PC resources by occupying CPU and memory, causing reduced performance, overheating, and higher electricity costs. The system slows down, apps may crash, and hardware lifespan shortens.

How can I prevent and protect my computer from miner virus infection?

Use antivirus software, update your system and browser regularly, avoid suspicious links, and enable ad blockers to defend against malicious mining scripts.

How are miner viruses different from other malware?

Miner viruses use your computer for covert cryptocurrency mining and do not steal data, unlike other malware. However, some viruses combine mining with other malicious activities.

Which antivirus programs can detect and remove miners?

ClamAV and Bitdefender can effectively detect and remove miner viruses. ClamAV is a cross-platform, open-source solution specializing in malware, while Bitdefender offers robust protection against various threats. Both are recommended for crypto miner defense.

If my computer is infected by a miner virus, what immediate actions should I take?

Immediately disconnect from the internet, disable Wi-Fi or unplug the cable. Run antivirus software to scan and remove the virus. Change all account passwords. Restart the system in Safe Mode if needed.