Cryptojacking is a specialized form of malware that secretly uses your computer's processing power to mine cryptocurrency for hackers. Unlike ransomware, which announces its presence, cryptojacking is designed to stay hidden, often resulting in sluggish performance, high electricity bills, and hardware degradation. In this guide, we will walk you through the professional steps to identify, remove, and prevent cryptojacking infections.

Step 1: Identify the Symptoms of Cryptojacking

Because cryptojackers want to remain undetected, you must look for subtle clues that your system resources are being hijacked. Common symptoms include:

• Unusual Performance Drops: Your PC suddenly becomes slow or freezes during basic tasks.
• Overheating: Your cooling fans are constantly running at high speeds, even when you aren't running heavy applications.
• Spiking CPU/GPU Usage: Your processor usage stays near 100% without an obvious cause.

Step 2: Inspect System Resources with Task Manager

The first physical check involves looking at your active processes to see what is consuming your hardware power.

• Press Ctrl + Shift + Esc to open the Task Manager (or Command + Space and type 'Activity Monitor' on Mac).
• Click on the Processes tab and sort by CPU usage.
• Look for unfamiliar processes. Common cryptomining scripts often disguise themselves with generic names like 'System' or 'Windows Update Service,' but they will show consistently high CPU or GPU usage (80%–100%).
• Right-click any suspicious process and select Search Online to see if it is a known miner.
• If confirmed malicious, right-click it and select End Task.

Step 3: Clean Your Web Browser Extensions

Many cryptojacking attacks occur through "In-Browser" mining scripts or malicious extensions. If your PC only slows down when your browser is open, this is likely the culprit.

• Open your browser settings and navigate to the Extensions or Add-ons menu.
• Review every installed extension. Remove anything you didn't personally install or haven't used in months.
• Check your browser's internal task manager (In Chrome/Edge, press Shift + Esc) to see if a specific tab is consuming massive amounts of memory or CPU.

Step 4: Perform a Deep Malware Scan

Standard antivirus software may sometimes miss stealthy miners. You need a tool with strong heuristics and PUP (Potentially Unwanted Program) detection.

• Download and install a reputable anti-malware tool like Malwarebytes or HitmanPro.
• Boot your computer into Safe Mode with Networking to prevent the malware from actively defending itself.
• Run a Full Threat Scan. Ensure the software is set to scan for 'Rootkits' and 'PUPs'.
• Once the scan is complete, Quarantine and Delete all flagged items.

Step 5: Check Task Scheduler for Persistence

Advanced cryptojackers use the Windows Task Scheduler to re-install themselves even after you delete the main file.

• Search for Task Scheduler in the Windows Start menu.
• Click on Task Scheduler Library.
• Look for tasks with suspicious names or those set to run at System Startup that point to obscure folders (like AppData/Local).
• Right-click and Delete any task that looks like a trigger for the mining software you just removed.

Step 6: Prevent Future Cryptojacking Attacks

Once your system is clean, take these steps to ensure you aren't infected again:

• Install an Ad-Blocker: Use extensions like uBlock Origin, which has built-in filters to block known coin-mining scripts (CoinBlockerLists).
• Disable JavaScript: Consider using a 'NoScript' extension to prevent unauthorized scripts from running in your browser.
• Keep Software Updated: Hackers often use unpatched browser vulnerabilities to inject mining code. Always run the latest version of your OS and Browser.

💡 Pro Tip: Keep your software updated to avoid these issues in the future.