Kevaxjcoin is a cryptocurrency mining malware that hijacks your computer's processing power to mine digital currency for remote attackers. First identified in late 2017, this threat operates silently in the background, consuming CPU and GPU resources to generate cryptocurrency revenue for criminals while degrading your system's performance and potentially shortening your hardware's lifespan. Users typically notice their computer running unusually slow, fans spinning loudly, and system temperatures elevated even when idle.
Threat Profile
| Attribute | Details |
|---|---|
| Malware Family | Cryptocurrency miner (Trojan:Win32/CoinMiner variant) |
| Common Aliases | Kevaxjcoin Miner, Win32/Kevaxjcoin, PUA:Win32/CoinMiner.Kevaxjcoin |
| Platform | Windows (7, 8, 8.1, 10, 11) — primarily 64-bit systems |
| First Documented | Late 2017 |
| Primary Distribution | Software bundling, cracked applications, malicious downloads, exploit kits |
| Persistence Mechanism | Registry Run keys, Scheduled Tasks, Windows service creation |
| Primary Capabilities | Cryptocurrency mining (Monero/XMR typical), resource consumption, system degradation |
| CPU/GPU Impact | 50-100% resource utilization during active mining cycles |
| Network Behavior | Connects to mining pools (typically on ports 3333, 14433, 14444), maintains persistent connections |
| Typical File Locations | %LOCALAPPDATA%, %APPDATA%, %TEMP% subfolders with randomized names |
| Self-Protection | Process hiding, file attribute manipulation, watchdog processes to restart if terminated |
| Removal Difficulty | Moderate — persistent mechanisms require thorough cleanup |
How It Spreads
Kevaxjcoin typically arrives on systems through deceptive software distribution channels. The most common infection vector involves bundled installations where the miner is packaged alongside seemingly legitimate freeware or shareware applications. Users who rush through installation wizards without reading the fine print often unknowingly authorize the installation of "additional components" that include the mining payload.
Cracked or pirated software represents another major distribution avenue. Attackers embed miners into popular applications, games, or productivity tools available through torrent sites and unofficial download portals. The appeal of "free" commercial software blinds users to the hidden cost: their computer becomes a cryptocurrency mining rig generating passive income for criminals.
Other distribution methods include:
- Malicious email attachments disguised as invoices, shipping notifications, or document files containing macro scripts or executable payloads
- Drive-by downloads from compromised websites or malicious advertisements that exploit browser vulnerabilities to install the miner without user interaction
- Software update impersonations presenting fake Adobe Flash, Java, or browser update prompts that deliver the mining malware instead
- Infected USB drives or external media containing auto-run scripts that deploy the miner when connected to a system
- Remote desktop compromises where attackers gain access through weak passwords and manually install mining software
- Supply chain compromises affecting legitimate software installers temporarily modified to include mining components
What It Does On Your Machine
Once installed, Kevaxjcoin establishes multiple persistence mechanisms to ensure it survives reboots and manual termination attempts. The malware creates registry entries in HKEY_CURRENT_USER or HKEY_LOCAL_MACHINE Run keys, schedules tasks through Windows Task Scheduler to launch at startup or specific intervals, and may install itself as a Windows service with an innocuous-sounding name designed to blend in with legitimate system processes.
The core functionality centers on cryptocurrency mining — typically Monero (XMR) due to its CPU-friendly mining algorithm and transaction privacy features. The miner connects to remote mining pools where it joins thousands of other compromised computers collectively solving cryptographic puzzles. Every completed calculation generates fractional cryptocurrency rewards deposited into the attacker's wallet. Your computer does all the work; the criminal collects all the profits.
The performance impact can be severe. Users report systems becoming nearly unusable, with simple tasks like opening a web browser or document taking minutes instead of seconds. Laptop users notice drastically reduced battery life as the CPU runs at maximum capacity. The constant high-load operation generates excessive heat, causing cooling fans to run continuously at maximum speed. Over extended periods, this thermal stress can degrade thermal paste, damage components, and significantly shorten hardware lifespan — essentially burning out your computer for someone else's financial gain.
Kevaxjcoin variants may also implement anti-detection measures including process name spoofing (disguising themselves as legitimate Windows processes like "svchost.exe" or "rundll32.exe"), file attribute manipulation to hide files from normal directory listings, and watchdog components that monitor for the main miner's termination and automatically restart it. Some versions detect when Task Manager or Process Explorer is running and temporarily reduce resource consumption to avoid detection, resuming full mining intensity once monitoring tools close.
Manual Removal — Step by Step
Disconnect from the Internet
Physically unplug your network cable or disable your Wi-Fi adapter through the Windows network settings. This prevents the miner from communicating with its mining pool and stops revenue generation immediately. It also prevents potential reinfection if the malware attempts to download additional components during the removal process.
Boot into Safe Mode with Networking
Restart your computer and press F8 repeatedly during startup (Windows 7) or hold Shift while clicking Restart (Windows 8/10/11), then navigate to Troubleshoot > Advanced Options > Startup Settings > Restart, and select Safe Mode with Networking. This loads Windows with minimal drivers and services, preventing most malware from automatically starting.
Identify and Terminate the Mining Process
Open Task Manager (Ctrl+Shift+Esc) and look for processes consuming abnormally high CPU percentages, especially those with random names or located in AppData folders. Right-click suspicious processes, select "Open file location" to identify the executable path, then end the process. Document the file location before terminating as you'll need to delete those files later.
Remove Registry Persistence Entries
Press Win+R, type "regedit" and press Enter. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run and HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run. Look for suspicious entries pointing to random folder locations or unfamiliar program names. Right-click and delete these entries. Also check HKLM\System\CurrentControlSet\Services for fake service entries.
Delete Scheduled Tasks
Open Task Scheduler (search for it in the Start menu), expand Task Scheduler Library, and review all scheduled tasks. Look for tasks with random names, tasks that run frequently (every few minutes), or tasks pointing to executable files in AppData or Temp folders. Right-click suspicious tasks and delete them. Pay special attention to tasks that claim to be Windows updates or system maintenance but point to non-standard locations.
Delete the Malware Files and Folders
Using the file locations you documented in step 3, navigate to those folders in File Explorer and delete the entire parent folder containing the mining executable. Typical locations include subfolders within %LOCALAPPDATA%, %APPDATA%, or %TEMP%. Enable "Show hidden files" in Folder Options if you cannot see these directories. Empty the Recycle Bin after deletion.
Scan with Malwarebytes or Similar Tool
Download and install Malwarebytes Free (from malwarebytes.com) while still in Safe Mode with Networking. Update its definitions and run a full Threat Scan. This catches persistence mechanisms or additional malware you might have missed during manual removal. Quarantine or delete all detected threats. Consider also running a secondary scanner like HitmanPro or Emsisoft Emergency Kit for verification.
Check Browser Extensions and Reset if Needed
Some Kevaxjcoin variants include browser-based mining scripts. Open your browser's extension/add-on manager and remove any unfamiliar or suspicious extensions. If the infection persists or you notice unusual browser behavior, reset your browser to default settings — this removes extensions, clears cached scripts, and eliminates browser-based miners.
Change Critical Passwords
While Kevaxjcoin primarily focuses on mining rather than data theft, some variants bundle additional malware including keyloggers or information stealers. Change passwords for critical accounts (email, banking, cloud storage) from a known-clean device before reconnecting your computer to the internet. Enable two-factor authentication wherever available.
Reboot Normally and Monitor Performance
Restart your computer into normal mode and reconnect to the internet. Monitor CPU usage in Task Manager for the first 30 minutes — it should remain low during idle periods. Check that your scheduled tasks and startup items look normal. Run one final scan with your antivirus software. If CPU usage remains abnormally high or suspicious processes reappear, the infection may not be completely removed and professional assistance is recommended.
Prevention
- Download software only from official sources. Avoid third-party download sites, torrent repositories, and "cracked" software archives. These are primary distribution channels for bundled malware including miners. When you need freeware, download directly from the developer's official website.
- Read installation prompts carefully. Never click "Next" repeatedly without reading what you're agreeing to install. Choose "Custom" or "Advanced" installation options to see and decline bundled offers. Uncheck any pre-selected boxes for "recommended" additional software or browser toolbars.
- Keep Windows and all software updated. Enable automatic updates for Windows, your web browser, and security software. Many miners exploit known vulnerabilities in outdated software. Patch management eliminates these entry points before attackers can leverage them.
- Use reputable antivirus with real-time protection. Install a quality security suite that includes real-time scanning, behavioral detection, and anti-exploit capabilities. Keep it updated and don't disable it even temporarily. Free options like Windows Defender (built into Windows 10/11) provide baseline protection if kept current.
- Enable your browser's built-in protection. Modern browsers include Safe Browsing features that warn about malicious sites and downloads. Don't disable these warnings. Consider browser extensions like uBlock Origin that block malicious scripts and ads serving malware.
- Be skeptical of email attachments and links. Don't open attachments from unknown senders or unexpected emails from known contacts (their account may be compromised). Hover over links to preview the actual URL before clicking. When in doubt, contact the sender through a separate communication channel to verify legitimacy.
- Monitor your system's performance regularly. Familiarize yourself with your computer's normal CPU usage, temperature, and fan noise levels. Investigate immediately if you notice sustained high resource consumption, unusual slowness, or excessive heat during idle periods — these are early warning signs of mining malware.
- Use a standard (non-administrator) account for daily tasks. Running Windows with limited user privileges restricts malware's ability to install services, modify system-level registry keys, and establish deep persistence. Reserve administrator accounts for software installation and system maintenance only.
Bring It In
Cryptocurrency miners like Kevaxjcoin represent a particularly insidious threat because they don't announce themselves with ransom notes or obvious file encryption. They operate silently, degrading your hardware while generating profit for criminals. If you've followed the manual removal steps above but still notice performance issues, or if the infection keeps returning despite your best efforts, professional removal is the most reliable solution. Some mining malware includes rootkit components or firmware-level persistence that standard removal techniques cannot address.
Computer Repair Roswell has removed hundreds of cryptocurrency miners from systems throughout the Atlanta area. We use specialized diagnostic tools to identify hidden persistence mechanisms, verify complete removal, and optimize your system performance after cleanup. Same-day service is typically available, and we'll explain what happened, how it got on your system, and specific steps to prevent reinfection tailored to your usage patterns. Call us at (770) 637-1555 or stop by our shop at 1390 Dogwood Dr SE, Conyers, GA 30013. Don't let criminals burn out your hardware for their financial gain — let's get your computer running properly again.