Oct. 1, 2020

It’s possible to remove malware from a Mac or PC by running a scanner and taking steps to fix your web browser. Here’s our step-by-step guide to removing malware from your computer.

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How to remove malware from a Mac

Step 1: Disconnect from the internet

Disconnecting from the internet will prevent more of your data from being sent to a malware server or the malware from spreading further. So stay offline as much as possible if you suspect that your computer has been infected. If you need to download a removal tool, disconnect after the download is complete and don’t connect again until you are sure that the malware has been removed.

Step 2: Enter safe mode

Safe mode, often referred to as safe boot, is a way to start your computer so that it performs checks and allows only the minimum required software and programs to load. If malware is set to load automatically, this will prevent the malware from doing so, making it easier to remove. To enter safe mode:

Start (or restart) your Mac, then immediately press and hold the Shift key. The Apple logo will appear on your display.
Release the Shift key when you see the login window (if you are asked to log in twice, learn more about what to do here).

Disclaimer: Avoid logging into accounts during malware removal

Be careful to not expose passwords though a copy-paste function or by clicking a ‘show password’ box if you suspect your computer has been infected. Keylogger viruses are a common component of malware, which run invisibly and are designed to capture your keystrokes. To avoid sharing your personally identifiable information, refrain from logging into sensitive accounts while your device is infected.

Step 3: Check your activity monitor for malicious applications

If you know that you’ve installed a suspicious update or application, close the application if it’s running. You can do so by using your activity monitor. This shows the processes that are running on your computer, so you can manage them and see how they affect your computer’s activity and performance.

Malware can take up resources on your computer, so check the CPU tab to see which applications are working the hardest. If you are able to find the suspicious application, you can close out of it through your activity monitor and then delete the application from the Finder menu. To check your activity monitor:

In Finder, click → Applications → Utilities → Activity Monitor → Select Application → Quit

Step 4: Run a malware scanner

Fortunately, malware scanners can remove most standard infections. It’s important to keep in mind that if you already have an antivirus program active on your computer, you should use a different scanner for this malware check since your current antivirus software may not detect the malware initially. If you believe your computer is infected, we recommend downloading an on-demand scanner from a reliable source and then installing and running security software which provides protection against existing and emerging malware, including ransomware and viruses.

Step 5: Verify your browser’s homepage

It’s common for malware to modify your web browser’s homepage to re-infect your Mac. Check your homepage and connection settings using the steps below for common browsers. Note that you will need to connect your computer to the internet to complete the following steps.

To verify your homepage on Chrome:

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In the top right corner of your Chrome browser, click More → Settings.
Select the dropdown menu in the “Search engine” section.
Verify your default homepage.

To verify your homepage on Safari:

In the top left corner of your screen, select Safari → Preferences → General.
Next to “New windows open with” and “New tabs open with,” select Homepage.
Next to “Homepage,” you will verify your default homepage.

Step 6: Clear your cache

After you’ve verified your homepage setting, you should clear your browser’s cache. This is a temporary storage location on your computer where data is saved so your browser doesn’t need to download it each time. Follow these steps below to learn how to clear your cache for Chrome and Safari.

To clear your cache on Chrome:

Select Chrome → History → Clear Browsing Data → Time Range → All Time → Clear Data.

To clear your cache on Safari:

Select Safari → Preferences → Privacy → Manage Website Data → Remove All.

How to remove malware from a PC

Step 1: Disconnect from the internet

Disconnecting from the internet will prevent more of your data from being sent to a malware server or the malware from spreading further.

Step 2: Enter safe mode

If malware is set to load automatically, this will prevent the malware from loading, making it easier to remove. To enter safe mode:

Restart your PC.
When you see the sign-in screen, hold down the Shift key and select Power → Restart.
After your PC restarts, to the “Choose an option” screen, select: Troubleshoot → Advanced Options → Startup Settings.
On the next window, click the Restart button and wait for the next screen to appear.
A menu will appear with numbered startup options. Select number 4 or F4 to start your PC in Safe Mode.

Disclaimer: Avoid logging into accounts during malware removal

To avoid sharing your personally identifiable information, do not log into sensitive accounts while your device is infected.

Step 3: Check your activity monitor for malicious applications

If you know that you’ve installed a suspicious update or application, close the application if it’s running. Your activity monitor shows the processes that are running on your computer, so you can see how they affect your computer’s activity and performance.

In Type to search type → Resource Monitor → Find End Task → Right Click → End Process

Step 4: Run a malware scanner

Luckily, malware scanners can remove many standard infections. But remember that if you already have an antivirus program active on your computer, you should use a different scanner for this malware check since your current antivirus software may not detect the malware initially.

Step 5: Fix your web browser

Malware is likely to modify your web browser’s homepage to re-infect your PC. Check your homepage and connection settings using the steps below for common browsers.

To verify your homepage on Chrome:

4. In the top right corner of your Chrome browser, click More → Settings.
5. Select the dropdown menu in the “Search engine” section.
6. Verify your default homepage.

To verify your homepage on Internet Explorer:

Select the Tools icon.
Click Internet options.
In the General tab, find the “Search” section and click Settings.
Verify your default homepage.

Step 6: Clear your cache

After you’ve verified your homepage setting, it’s imperative to clear your browser’s cache. Follow these steps below to learn how to clear your cache for Chrome and Internet Explorer.

To clear your cache on Chrome:

History → Clear Brows

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