According to computer security professionals, a browser extension called TheorySource is a dangerous program that Mac users should stay away from. Its primary goal is to take control of the web browser program in order to monetize it by showing intrusive ad types, which is why it belongs to the Adware family of threats. Mac users will see the excessive ad display from the aforementioned adware as soon as TheorySource is able to take control of the internet application.
How does TheorySource app enters Mac?
A Mac system is designed to be secure and resistant to malware. But unfortunately, if the virus is executed by the Mac user themselves and has been granted permission, it will simply enter the machine in the same manner as other apps. Because of this, hackers are now using shareware and freeware to spread harmful programs like TheorySource and similar ones as ConnectionTiming, DefaultSection, OptimalManager, and many more.
Freeware is frequently housed on websites where Mac users enjoy obtaining essential software. Unfortunately, it can be challenging to discern between virus-free programs and those that have malware built right into them. Because to this, some Mac users unintentionally set up TheorySource during the installation of downloaded applications.
Additionally, there are instances where the TheorySource app contains a fake software update that is promoted by aggressive pop-up ads, as seen in the image below.
Prevention and elimination of TheorySource
The best line of defense against downloading harmful software like TheorySource is to use caution online. It’s critical to avoid dubious file sites that provide free software downloads. Web users should, wherever feasible, only download the software through the program’s official websites or its authorized partners. Additionally, refrain from downloading cracked programs because both their website and the actual software are frequently the source of many malware infestations.
We have created a straightforward removal instruction on this website in the event that TheorySource was successful in infiltrating the Mac machine. Carefully follow the directions and run the recommended virus and malware scanners on the computer.
Procedures to Remove TheorySource from Mac
This area contains comprehensive procedures to help you remove adware and potentially unwanted program from the computer.
Guide on this page are written in a manner that can be easily understand and execute by Mac users.
Quick Fix - Scan the Mac Computer with Combo Cleaner
Combo Cleaner is a trusted Mac utility application with complete antivirus and optimization features. It is useful in dealing with adware, malware, and PUP's. Moreover, it can get rid of adware like TheorySource. You may need to purchase the full version if you want to maximize its premium features.
1. Download the tool from the following page:
2. Double-click the downloaded file and proceed with the installation.
3. In the opened window, drag and drop the Combo Cleaner icon onto your Applications folder icon.
4. Open your Launchpad and click on the Combo Cleaner icon.
5. Wait until your antivirus downloads its latest virus definition updates.
6. Next, click on "Start Combo Scan" to start removing TheorySource.
7. Free features of Combo Cleaner include Disk Cleaner, Big Files finder, Duplicate files finder, and Uninstaller. To use antivirus and privacy scanner, users have to upgrade to a premium version.
Proceed with the rest of the removal steps if you are comfortable manually removing malicious objects associated with the threat.
Step 1 : Delete TheorySource from Mac Applications
1. Go to Finder.
2. On the menu, click Go and then, select Applications from the list to open Applications Folder.
3. Find TheorySource or any unwanted program or suspicious item. It could be in disguise as a different file.
4. Drag TheorySource to Trash Bin to delete the application from Mac.
5. Right-click on Trash icon and click on Empty Trash.
Step 2 : Remove Browser Extensions that belongs to TheorySource
1. Locate the add-on or extension that is relevant to the adware. To do this, please follow the following depending on affected browser.
Safari - Choose Preferences from the Safari menu, then click the Extensions icon. This will open a window showing all installed extensions.
Chrome - Select Preferences from the Chrome menu, and then click the Extensions link found on the left pane.
Firefox - Choose Add-ons from the Menu. Look at both the Extensions and Plug-ins lists when it opens a new window.
2. Once you have located TheorySource, click on Remove or Uninstall, to get rid of it.
3. Close the browser and proceed to the next steps.
Step 3 : Delete Malicious Files that have installed TheorySource
1. Select and copy the string below to your Clipboard by pressing Command + C on your keyboard.
2. Go to your Finder. From the menu bar please select Go > Go to Folder...
3. Press Command + V on your keyboard to paste the copied string. Press Return to go to the said folder.
4. You will now see a folder named LaunchAgents. Take note of the following files inside the folder:
The term unknown is just a representation of the actual malware name. Attackers may masks the actual name with following:
- TheorySource App
If you cannot find the specified file, please look for any unfamiliar or suspicious entries. It may be the one causing TheorySource to be present on your Mac. Arranging all items to see the most latest ones may also help you identify recently installed unfamiliar files. Please press Option + Command + 4 on your keyboard to arrange the application list in chronological order.
Important: Take note of all the suspicious files as you may also delete the same item on another folder as we go on.
5. Drag all suspicious files that you may find to Trash.
6. Please restart the computer.
7. Open another folder using the same method as above. Copy and Paste the following string to easily locate the folder.
8. Look for any suspicious items that are similar to the ones in Step 4. Drag them to the Trash.
9. Repeat the process on the following non-hidden folders (without ~):
10. Lastly, go to your Finder and open the Applications Folder. Look for subfolders with the following names and drag them to Trash.
- TheorySource App
Optional : For locked files that cannot be removed, do the following:
1. Go to Launchpad, Utilities folder, open Activity Monitor.
2. Select the process you want to quit.
3. Click on Force Quit button.
4. You may now delete or remove locked files that belongs to TheorySource adware.
Step 4 : Double-check with MBAM Tool for Mac
1. Download Malwarebytes Anti-malware for Mac from this link:
2. Run Malwarebytes Anti-malware for Mac. It will check for updates and download the most recent version if one is available. This is necessary for finding recent malware threats, including TheorySource.
3. If it prompts to close all running web browser, please do so. Thus, we advise you to PRINT this guide for your reference before going offline.
4. Once it opens the user interface, please click on the Scan button to start scanning your Mac computer.
5. After the scan, Malwarebytes Anti-malware for Mac will display a list of identified threats, and TheorySource is surely part of it. Be sure to select all items in the list. Then, click the Remove button to clean the computer.
Step 5 : Remove TheorySource from Homepage and Search
- Open your Safari browser.
- Go to the Safari Menu located in the upper left-hand corner, and then select Preferences.
- Under the General tab, navigate to the Default Search Engine section and select Google or any valid search engine.
- Next, be sure that the "New Windows Open With" field is set to Homepage.
- Lastly, remove TheorySource from the Homepage field. Replace it with your preferred URL to be set as your default homepage.
- Open the Google Chrome browser.
- Input the following on the address bar and press Enter on the keyboard : chrome://settings/
- Look for 'On Startup' area on the sidebar.
- Select 'Open a specific page or set of pages'.
- Choose the unwanted homepage, and click on Ellipses (three dots) and select Edit.
- Enter the desired web address as your homepage, replacing the TheorySource setting. Click Save.
- To set the default search engine, go to the Search Engine area from the sidebar link.
- Click on 'Manage search engines...' button.
- Select the questionable Search Engine and click on Ellipses (three dots). ClickDelete. to remove it from the list.
- Go back to the Search Engine area and choose a valid entry (i.e., Google) from 'Search engine used in the address bar'.
- Run Mozilla Firefox browser.
- Type the following on the address bar and hit Enter on keyboard : about:preferences
- Click Home on the sidebar area.
- Under "New Windows and Tabs", you may choose Firefox Home (Default) or Custom URLs. - Input the desired URL to replace TheorySource settings if you chose Custom URLs.
- To configure default search engine, select Search on the sidebar to display the settings.
- Under the Default Search Engine list, please select one (i.e., Google).
- On the same page, you have the option to Remove unwanted search engines.
Optional : If you are unable to change browser settings, execute these steps:
Some users complain that there is no way to change browser settings because they are grayed out by TheorySource. In such a situation, it is important to check if there is an unwanted profile. Please do the following:
1. Quit any running applications and launch System Preferences from your Dock.
2. Under System Preferences, click Profiles.
3. Select TheorySource or any relevant profile from the left pane. See the image below.
4. At the bottom of this window, click the minus [-] button to delete the account. Please refer to the image above.
5. Close the Profiles window and open the affected browser to change all settings associated with TheorySource.