Miner Viruses: What They Are and How to Remove a Miner from Your PC

What Are Crypto-Mining Viruses?

Crypto-mining viruses are specialized forms of malware that stealthily infiltrate computers, smartphones, tablets, or other devices and exploit their hardware resources for cryptocurrency mining. Simply put, these programs transform your device into an unwitting “farm” to mine digital coins, such as Bitcoin, Monero, Ethereum, and others. All profits generated from the infected device go directly to cybercriminals—not the rightful owner.

Crypto-mining viruses threaten a broad spectrum of devices: from everyday computers and laptops to Android and iOS phones, and even enterprise network servers. This versatility makes them especially dangerous in today’s digital environment.

The main objective of this malware is to deploy a hidden miner that continuously solves complex mathematical problems to generate new cryptocurrency blocks and earn rewards. The crypto-mining virus typically runs in the background, with no obvious windows, notifications, or signs of activity. However, mining severely impacts device performance—placing heavy loads on the CPU and often the GPU. As a result, devices slow down, experience performance issues, and overheat. Hardware components wear out faster due to constant operation at peak capacity and may fail prematurely, leading to additional financial losses for owners.

Who Develops Malicious Miners—and Why?

Cybercriminals of all levels of organization develop and distribute crypto-mining viruses. Some attacks are orchestrated by well-structured hacker groups with clearly defined roles, mainly pursuing financial gain. Mining cryptocurrency using hijacked computing power generates steady income, and infected devices allow criminals to mine coins with almost no investment in expensive hardware or electricity—the main costs for legitimate miners.

In the information security industry, such attacks are often called cryptojacking (from English cryptojacking—the illegal use of others’ computing resources for mining). This cybercrime became especially common in the late 2010s, when soaring cryptocurrency prices made mining even more lucrative. The low entry barrier and relative anonymity of crypto transactions further entice criminals.

Crypto-mining viruses are engineered for maximum stealth, so victims may remain unaware of infection for extended periods. This is a strategic advantage for hackers: unlike ransomware, which immediately announces itself by locking files and demanding payment, miners can quietly extract coins for months or even years. The longer a virus remains undetected, the more cryptocurrency attackers can accumulate.

How Does Infection Occur? Can Phones Be Infected?

Malicious miners typically do not infect devices autonomously—an attacker or a specialized dropper program must install them. There are several main attack vectors and infection methods for crypto-mining viruses you should know to ensure effective protection:

Downloading Infected Software

This is among the most common spread methods. Miners often masquerade as pirated versions of popular software or games, Windows activators, crack tools, and other illegal applications. Users download such files from torrent trackers or unverified sites, launch the installer expecting free software—and inadvertently install a hidden crypto-miner. The main program often works as intended, avoiding suspicion.

Via Dedicated Dropper Viruses

Attackers frequently use droppers—small loader programs that infiltrate first (for example, via software vulnerabilities or bundled with other apps) and then download the miner and additional malicious components from the internet. This multi-stage approach aids in evading antivirus protection.

Through Email and Phishing

This time-tested but still effective method involves receiving emails with infected attachments (e.g., Word documents with malicious macros, archives containing executables, or programs masquerading as invoices or bills). Such emails may look like legitimate business correspondence or messages from familiar organizations. Opening the file and enabling macros can trigger a script that downloads and installs a crypto-mining virus on your computer.

Exploits and Network Worms

Some advanced miners can self-propagate by exploiting vulnerabilities in the operating system or network services. For example, the notorious WannaMine virus leverages Windows exploits (previously used by the WannaCry ransomware) to spread automatically across local networks to unprotected machines, creating entire networks of infected devices.

Via Browser Scripts (Cryptojacking)

A modern attack method where mining occurs directly in your web browser while you visit a compromised or purpose-built website. Attackers embed JavaScript miners into the webpage code—while you remain on the site, your browser harnesses CPU resources for cryptocurrency mining. Mining typically stops when you close the tab, but some scripts can persist in the background.

Can Smartphones Be Infected by Miners?

Yes, mobile devices are also vulnerable to crypto-mining viruses. Malicious miners exist for Android and, in theory, even iOS (though infections on iPhone and iPad are extremely rare due to the platform’s closed nature and strict App Store controls). Numerous Android incidents have been reported where hidden miners were embedded in popular apps, games, or utilities distributed through third-party app stores. Mobile miners are especially dangerous, as they can quickly drain batteries and cause overheating, sometimes leading to physical battery damage.

Notorious Malicious Miner Examples

CoinMiner. This collective term covers a broad family of miner trojans in various forms. These programs most often infect computers through malicious email attachments, phishing sites posing as legitimate resources, or harmful files distributed online as useful software. CoinMiner can be configured to mine various cryptocurrencies.

XMRig. A popular open-source mining application originally designed for legitimate Monero mining, but widely exploited by attackers who covertly deploy it on compromised systems. XMRig itself is legal and efficient, but it’s frequently bundled into viruses and trojans, modified for stealth, and set to pay out to hacker wallets. Thanks to its CPU optimization and Monero’s anonymity, XMRig is a favorite tool of cybercriminals.

WannaMine. A highly dangerous miner with self-propagation capabilities. It exploits known Windows vulnerabilities (notably EternalBlue) to automatically infect other computers on the local network without user intervention, enabling rapid spread across corporate environments.

HiddenMiner. A specialized mobile miner for Android devices, cleverly concealed inside seemingly harmless apps. Once a compromised app is installed, the virus activates quietly and mines cryptocurrency intensively, maxing out the device’s CPU. This leads to overheating, rapid battery drain, and even physical damage or swelling, posing safety risks to users.

Smominru. One of the largest and most prolific known botnets specifically built for cryptocurrency mining. At its peak, Smominru infected more than 500,000 Windows computers and servers worldwide, creating an extensive distributed network to mine Monero. Smominru spread using a mix of exploits and social engineering.

How to Identify a Miner Infection on Your Device

Crypto-mining viruses are designed to remain as hidden as possible, but their ongoing activity reveals itself through several indirect symptoms. Watch for these key signs of miner infection:

1. Performance Drops

One of the first and most noticeable warning signs is a sudden, unexplained decrease in device performance. If your computer or laptop lags during routine tasks (opening browsers, working with documents, streaming video), or your smartphone stutters even on basic apps and system functions, be alert. Such issues are particularly suspicious if your device previously operated normally and the problems appeared abruptly.

2. Device Overheating

Devices infected by miners often overheat and become unusually hot, even when you haven’t launched resource-intensive apps and the device is idle. Desktop or laptop cooling fans may run loudly at high speed, struggling to dissipate excess heat—this is a direct result of intense CPU and GPU workloads.

3. Suspicious Programs Running

The operating system’s task manager may show unfamiliar processes. If you see processes with odd names (especially those with terms like "miner," "crypto," "xmr") consuming resources, or processes lacking descriptions or publishers, investigate further.

4. Consistently High CPU/GPU Load

The CPU or GPU remains loaded at 70–100% even when you’re not running demanding tasks, playing games, or editing videos. Open Task Manager (Ctrl + Shift + Esc in Windows) and check the “Performance” tab for any process that consistently uses excessive CPU or GPU resources for no clear reason.

Important: The load may suddenly decrease or vanish when you attempt to monitor it. The most sophisticated miners are programmed to pause or reduce activity if they detect that the user has opened Task Manager, System Monitor, or other monitoring tools, making detection harder.

5. System Lag and Slowdowns

The operating system responds slowly to user actions, programs take longer to open, and video playback may stutter or freeze. Games may run at lower frame rates, with freezes and stutters not previously observed. Even simple actions, like switching windows, may lag.

6. Rapid Battery Drain

If your mobile phone or laptop overheats and the battery drains quickly—even with minimal use and no energy-intensive apps running—hidden mining may be active in the background. The battery can discharge many times faster than normal due to sustained CPU usage.

7. Antivirus Warnings

If your antivirus suddenly warns of threats like Trojan.Miner, CoinMiner, Riskware.Miner, or blocks processes and files with names containing “coin,” “miner,” or “crypto,” your system is likely infected by a miner. Never ignore such alerts.

8. Increased Network Traffic or Suspicious Network Activity

You might notice unknown outbound connections in firewall settings, unusual spikes in outgoing traffic, or links to suspicious IP addresses and domains. Miners must constantly communicate with mining pools, producing characteristic network activity.

How to Remove a Miner

Manual Removal from PC

Step-by-step guide to manually removing a crypto-mining virus from your computer:

1. Disconnect from the internet. This is the first step if you suspect a miner infection. Immediately disconnecting prevents the virus from contacting its command server, stops transfer of mined cryptocurrency, and halts further spread across your network. Disable your Wi-Fi adapter or unplug the network cable—your computer or laptop should remain offline until the cleaning process is complete.

2. Identify and terminate suspicious processes. Open Task Manager (Ctrl+Shift+Esc in Windows) and carefully check the “Processes” tab for any process causing abnormally high CPU or GPU load. Watch for suspicious names, missing descriptions, or unknown publishers. If you find such a process, select it and click “End Task”.

3. Locate the miner file on disk. With the suspicious process stopped (before restarting the system), find the executable file for this malware on your hard drive. In Task Manager, right-click the process and choose “Open file location” or “Properties” → “Open file location.” Note or copy the full path to this file.

4. Delete the virus files. Once you’ve pinpointed the miner file’s location, delete the file and any related files in the folder (such as config files or libraries). If you can’t delete the file and receive a system error, reboot into Safe Mode and try deleting it there, where most programs won’t run.

5. Clean up startup and scheduled tasks. It’s crucial to remove not only the active miner process, but also any “anchors” or mechanisms that allow automatic launch at system startup or on a schedule. Check Startup: open Task Manager → go to the “Startup” tab and review the list for unknown or suspicious programs or entries without publishers. Disable or delete these items. Also, open Windows Task Scheduler and review scheduled tasks, deleting any that launch unknown programs. Additionally, open Registry Editor (Win+R → regedit), use Edit → Find, enter the miner file’s name, and delete all related registry keys.

6. Restart and check your system. Reconnect to the internet and reboot in normal mode. After restarting, observe your computer: has the fan quieted down, has abnormal CPU load stopped, and is normal performance restored? Check Task Manager to ensure the suspicious process hasn’t returned.

7. Scan with antivirus software. After manual cleaning, always perform a thorough scan with reputable antivirus software to detect any remaining threats. Run a full deep scan of all drives and partitions. Follow the antivirus recommendations to delete or quarantine any detected risks.

Removing Miner Viruses With Free Tools

Step 1. Use Dr.Web CureIt! scanner. One of the most effective free ways to detect and remove miners is Dr.Web CureIt!—a powerful antivirus scanner from Dr.Web that does not require installation and is free for home use. Download the latest version from Dr.Web’s official site. Close unnecessary programs, launch the scanner as administrator, and start a full system scan. The scanner will thoroughly check all disks for threats, including various miner variants. After scanning, click “Neutralize” or “Cure” for all detected threats and follow the instructions.

Step 2. Scan with Microsoft Defender. For added reliability, scan your computer with another antivirus tool. Windows 10/11 includes built-in Microsoft Defender (formerly Windows Defender)—a highly capable antivirus. Open Windows Security Center from the Start menu or tray icon → go to “Virus & threat protection” → “Scan options.” Select Full scan and start it. The process may take time but is necessary for thorough protection.

Step 3. Alternative free antivirus utilities. If previous methods aren’t available or effective, try other reputable free utilities and scanners: Malwarebytes Free (excellent against miners and adware), Kaspersky Virus Removal Tool (free removal utility), ESET Online Scanner (browser-based and installation-free), Zemana AntiMalware Free (specializes in hidden threats).

What If You Can’t Remove a Miner?

• Run antivirus scans in Windows Safe Mode. Many antivirus tools work in safe mode, where malware is usually inactive and easier to remove.
• Use different antivirus utilities. If you only scanned with Defender, try Malwarebytes, Dr.Web CureIt!, or Kaspersky Virus Removal Tool. Different solutions use different detection methods.
• Double-check for leftover startup entries. Review startup, scheduled tasks, and registry keys again. Remove all tasks and registry entries related to the miner.
• Seek help on technical support or security forums, where experts can assist with log analysis.
• If all else fails—reinstall your operating system. If the miner persists, a clean reinstall of Windows, Linux, or Android with partition formatting will guarantee removal. Back up important data first.

How to Protect Your Computer Against Hidden Miners

• Install and enable a reliable antivirus. Modern antivirus software can prevent miner infections in most cases by detecting threats early. For home users, Microsoft Defender on Windows 10/11 is often sufficient and performs well in independent tests. Always keep antivirus databases updated.
• Promptly update your OS and apps. Install security updates for Windows, Android, macOS, and all applications as soon as available. Patched vulnerabilities stop worms and exploits from invading your device.
• Never download software from untrusted sources. Avoid pirated apps, cracked games, activators, and other illegal software. Always use official sources and app stores (Microsoft Store, App Store, Google Play, official developer websites).
• Practice email and link caution. Don’t open attachments or click links from unknown or suspicious senders. Avoid questionable links in messenger and social media messages. Verify sender addresses.
• Use ad and script blockers in your browser. Extensions that block ads and dangerous scripts help guard against web-based mining and malicious ads. Popular options include uBlock Origin, AdBlock Plus, AdGuard, and NoScript (for advanced users).
• Monitor your device regularly. Periodically check Task Manager, monitor CPU/GPU temperatures with utilities, and watch for performance drops. If you notice issues, act quickly to diagnose and resolve.

FAQ

What Is a Miner Virus and How Does It Infect My Computer?

A miner virus is malicious software that exploits your PC’s resources to mine cryptocurrencies without permission. Infection occurs via malicious links, attachments, or downloads. After infection, the virus consumes CPU power and bandwidth, slowing down your system.

What Are the Symptoms of Miner Virus Infection? How Can I Tell If My Computer Is Infected?

Signs of infection include overheating, a sudden spike in electricity bills, and system performance slowdowns. Check Task Scheduler for suspicious entries like “Drivers,” “WebServers,” or “DnsScan.” If you find these, your computer is infected with a miner virus.

How Do I Completely Remove a Miner Virus from My Computer? Which Removal Tools Are Effective?

Use professional antivirus software such as Malwarebytes or AdwCleaner to scan for and remove miners. Keep your system and software updated. Disable autorun for suspicious processes in Task Manager to prevent reinfection.

How Do Crypto-Mining Viruses Affect Computer Performance and What Damage Do They Cause?

Crypto-mining viruses drastically reduce PC performance, causing system slowdowns, CPU overheating, and increased power consumption. This results in crashes, freezes, and possible hardware failure, seriously disrupting workflow.

How Can I Prevent Crypto-Mining Virus Infection? What Protective Measures Are Available?

Install and regularly update antivirus software. Keep your operating system current. Avoid downloading unknown files or apps. Use strong passwords and two-factor authentication to secure your accounts.

What Are Common Transmission Methods for Crypto-Mining Viruses?

Main transmission methods include downloading cracked software and hacks from unreliable sources, phishing attacks via malicious links, infected email attachments, compromised websites, and P2P networks.

Can Professional Antivirus Software Detect and Remove Crypto-Mining Viruses?

Yes, professional antivirus solutions typically detect and remove crypto-mining viruses, but effectiveness depends on up-to-date virus databases and detection technologies.

What Should I Do If I Can’t Manually Remove a Miner Virus?

Use professional antivirus software to scan and remove threats. Identify and terminate malicious processes in Task Manager. Delete suspicious files and clean up autorun entries. Update your system and reboot to fully remove the threat.