For years, many users believed the myth that Macs were immune to viruses. However, as macOS market share has grown, so has the volume of adware, browser hijackers, and Potentially Unwanted Applications (PUAs) targeting Apple users. If your Mac is experiencing sudden slowdowns, frequent pop-ups, or homepage redirects, it likely has a malware infection. This guide provides a professional walkthrough to clean your system.

Step 1: Disconnect and Enter Safe Mode

To prevent malware from communicating with its command-and-control servers or spreading further, turn off your Wi-Fi or unplug your Ethernet cable. Next, boot your Mac into Safe Mode to prevent malicious background items from loading:

• For Apple Silicon Macs (M1/M2/M3): Shut down your Mac. Press and hold the Power button until "Loading startup options" appears. Select your startup disk, press and hold the Shift key, and click Continue in Safe Mode.
• For Intel-based Macs: Restart your Mac and immediately press and hold the Shift key until the login window appears.

Step 2: Check Activity Monitor for Malicious Processes

Open Activity Monitor (found in Applications > Utilities). Click on the CPU tab and look for processes that have unusual names or are consuming an exceptionally high percentage of resources. If you find a suspicious process, click it, then click the 'X' icon at the top left and select Force Quit.

Step 3: Uninstall Suspicious Applications

Open your Applications folder in Finder. Review every app on the list. If you see software you don't recognize or apps like "MacKeeper" or "Search Marquis" that often bundle with malware, right-click and select Move to Trash. Ensure you Empty the Trash immediately after.

Step 4: Remove Malicious Login Items

Malware often ensures it stays active by launching every time you log in. To stop this:

• Go to the Apple Menu > System Settings (or System Preferences).
• Navigate to General > Login Items.
• Check the list under "Open at Login" and "Allow in the Background." Select any unrecognized entries and click the minus (-) button to remove them.

Step 5: Clean Up Browser Extensions and Redirects

Malware frequently targets your browser to inject ads. You must clean every browser you use:

• Safari: Go to Settings > Extensions. Find any extension you didn't install and click Uninstall.
• Chrome: Type chrome://extensions in the address bar and remove suspicious toggles.
• General: Check your browser's homepage and default search engine settings to ensure they haven't been changed to a malicious URL.

Step 6: Eliminate Malicious Configuration Profiles

In some cases, malware installs a "Profile" that forces your Mac to behave in a certain way (common in enterprise-targeted malware). Go to System Settings > Privacy & Security > Profiles. If you see a profile you didn't manually install (like "AdminPrefs"), select it and click the minus (-) button to delete it.

Step 7: Run a Specialized Malware Scanner

Manual cleaning can sometimes miss hidden files in the /Library/LaunchAgents or /Library/LaunchDaemons folders. Download a reputable scanner like Malwarebytes for Mac. Run a full system scan to identify and quarantine any deep-seated malicious files that remain. Once finished, restart your Mac normally and reconnect to the internet.

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