Maincaptchasource Virus


Maincaptchasource is a program that targets popular web browsers with the intention of filling them with sponsored ads. In order to achieve this, Maincaptchasource will typically alter some of the major settings of your favorite web browser.


The Maincaptchasource virus

For instance, you may find that Maincaptchasource has replaced the homepage you had set or the default search engine you had been using. Furthermore, software of this type has also been known to initiate automatic page redirects during users’ browsing sessions. Thus, users end up being rerouted to various sponsored websites without ever asking to see them.

The Maincaptchasource Virus

Other symptoms of an infection with the Maincaptchasource virus include an increase in the amount of sponsored search results that appear for your queries. Similarly, you may start seeing a lot more popups, banners, box messages and various other types of online ads as you browse the web.

And perhaps what’s most annoying about all of this is that if you try to change the settings of your Chrome, Firefox, Opera or other popular browsing app back again, you won’t be able to. The moment you restart your browser, the changes imposed by Maincaptchasource will be back to greet you.

What is Maincaptchasource?

Software of this kind as Maincaptchasource is known as browser hijackers. And the only chance you stand against all of the alterations it has enforced on your browsing experience is if you remove Maincaptchasource from your system. But here’s the catch. Software developers don’t like the idea of users removing their cash cows. After all, browser hijackers are designed to generate revenue from clicks and views on the displayed advertising messages.

So they’ve found a way to make it more difficult for users to get rid of their pesky hijackers. How? By simply not including an obvious uninstallation menu. And as a result, users are left with the need to figure out how to get rid of the annoying software on their own.

If you’ve had to do this already, then you’ve probably already been in the situation where you thought you deleted the browser hijacker only to find that soon after it’s back again. This happens due to the fact that failing to delete all of the components of the hijacker enables it to reinstall itself again in the system.

Hence, for the thorough and certain removal of , you may require a little assistance in the form of a guide like the one we’ve put together just below this post. We have also linked a hand removal tool that can help scan your system and automatically remove any unwanted programs like this one.

We do, in fact, encourage the removal of browser hijackers as well. Although they aren’t considered to be dangerous or malicious like computer viruses, they have a bunch of risks associated with them that make them a potential vulnerability to your system’s security. For instance, the ads displayed by Maincaptchasource, Bestcaptcharesolver and Fastcaptchasolver, could lead to compromised or unsafe web locations. And those location, in turn, could be harboring malicious programs like worms, ransomware, rootkits and Trojan horse viruses.


Name Maincaptchasource
Type  Adware/Browser Hijacker
Detection Tool

anti-malware offerOFFER *Read more details in the first ad on this page, EULA, Privacy Policy, and full terms for Free Remover.

Remove Maincaptchasource

Some users may remove Maincaptchasource successfully by removing its extension from the Extensions list in their web browser. You might want to try the instructions below and see if they work for you.

  1. Click on the Settings option of your browser and select More Tools (or Add-ons).
  2. Click on the Extensions tab next.
  3. In the list, look for the Maincaptchasource extension
  4. Click on the Trash bin icon to remove it or select the remove button next to it.
  5. If you find other unfamiliar extensions that you haven’t installed or approved, remove them too.

Please follow the more detailed removal guide below if the short instructions aren’t enough to rid you of Maincaptchasource completely. The guide includes specific steps for removing Maincaptchasource from Chrome, Firefox, and Internet Explorer, as well as steps for how to find and remove Maincaptchasource from some of the most common system locations it can nest itself.


To complete the next steps successfully, please bookmark this page and restart the computer in Safe Mode. After the computer reboots in Safe mode, click on the bookmark icon, select this page and continue with the removal process of Maincaptchasource .



Type “Task Manager” in the Windows search field, select it and open the Processes Tab (Details” Tab on Win 8 and 10).  Once there, carefully search for processes operated by Maincaptchasource in the list and if you find any, right-click on every one of them individually. Then, select Open File Location.


It may be difficult to determine if the files in that location are dangerous or not just by looking at them. Thus, we suggest that you use the free online virus scanner below to test them:

Each file will be scanned with up to 64 antivirus programs to ensure maximum accuracy
This scanner is free and will always remain free for our website's users.
This file is not matched with any known malware in the database. You can either do a full real-time scan of the file or skip it to upload a new file. Doing a full scan with 64 antivirus programs can take up to 3-4 minutes per file.
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Each file will be scanned with up to 64 antivirus programs to ensure maximum accuracy
    This scanner is based on VirusTotal's API. By submitting data to it, you agree to their Terms of Service and Privacy Policy, and to the sharing of your sample submission with the security community. Please do not submit files with personal information if you do not want them to be shared.

    In case the scanner shows that the tested files are related to Maincaptchasource and are dangerous, go to the Processes tab to end the related process and delete their folders from the file location.  


    In the next step, type the following command appwiz.cpl in the windows search field and press Enter. This should open a Control Panel window where you can uninstall or change programs by right-clicking on them. Search for Maincaptchasource and other suspicious programs in the list and uninstall them if they are causing you trouble or have been installed without your approval.

    Next, go to the windows search field once again and type msconfig in it. Hit Enter and open the Startup tab:


    If you find Maincaptchasource in the list of Startup Items, uncheck its checkmark from the related box and click OK.


    Open a Run window by pressing the Windows Key and R together. After that,  paste the line listed below in the text field of the Run window: 

    notepad %windir%/system32/Drivers/etc/hosts

    Press Enter and scroll the Hosts file that opens until you find where it writes Localhost. Check for suspicious-looking IPs under Localhost that have been added by Maincaptchasource . If you see anything unusual, (like on the image below) copy the questionable IP addresses and paste them in a comment below this post. We will take a look at them and will tell you if they are dangerous and what you need to do next.

    hosts_opt (1)

    Click on the start menu butty and type Network Connections in the search field. If you are using Windows 10, immediately start writing it after clicking the Windows start menu button), press enter. After that follow the instructions below:

    1. Find the Network Adapter that is currently being used, right-click it and select Properties.
    2. Next, scroll until you find Internet Protocol Version 4 (ICP/IP) and highlight it. After that, click on the Properties button at the bottom.
    3. In the new Properties window select Obtain DNS server automatically and click on Advanced
    4. After that, tap on the DNS tab and remove everything in the DNS server addresses field. Click OK to save the changes.



    In the next few lines, you will find the basic guidelines for how to remove Maincaptchasource from three of the most commonly used browsers. If the browser that is hijacked isn’t among them, this should not discourage you to apply the instructions in it as in most cases, they are similar if not identical.

    Find the shortcut icon of the hijacked browser and right-click on it. After that select  Properties.


    Once the Properties window opens, select the Shortcut tab. After that, go to Target and remove everything that might have been added after .exe. Click OK at the end.

    Browser Hijacker Removal Instructions

    ie9-10_512x512  Remove Maincaptchasource  from Internet Explorer:

    In Internet Explorer, click this icon IE GEAR You will find it at the top right. A slide-down menu will open. Select Manage Add-ons.

    pic 3

    Once you find yourself in the add-ons list, search for Maincaptchasource and select Disable.

    Next, go back to the top right corner and click this icon IE GEAR again. This time select Internet Options and check for changes in the homepage section. If you notice that Maincaptchasource has placed a URL of its own as a homepage, change it to an address that you want and Apply the changes. 

    firefox-512 Remove Maincaptchasource  from Firefox:

    The instructions in Firefox are not very different. The menu icon looks like this mozilla menu and is found in the upper right corner of the screen. Tap it and select Add-ons, then hit the Extensions tab from the left panel. Search for extensions added by Maincaptchasource and remove them.

    pic 6

    chrome-logo-transparent-backgroundRemove Maincaptchasource  from Chrome:

    Close Google Chrome and open My Computer/This PC desktop icon. Navigate to the following path:

     C:/Users/!!!!USER NAME!!!!/AppData/Local/Google/Chrome/User Data. 

    Find the “Default” folder inside and select it. Then right-click on it and select Rename. Change the name to Backup Default and save it. 

    Rename the Folder to Backup Default

    Restart Chrome after that. 


    Type Regedit in the windows search field and press Enter.
    Insidepress CTRL and F together and type the threat’s NameRight click and delete any entries you find with a similar name.

    If they don’t show up this waygo manually to these directories and delete/uninstall them:

    • HKEY_CURRENT_USER—-Software—Random Directory
    • HKEY_CURRENT_USER—-SoftwareMicrosoft—-WindowsCurrentVersionRun— Random
    • HKEY_CURRENT_USER—-SoftwareMicrosoftInternet Explorer—-Main—- Random

    If the guide doesn’t helpdownload the antivirus program we recommended or try our free online virus scannerAlsoyou can always ask us in the comments for help!


    About the author


    Violet George

    Violet is an active writer with a passion for all things cyber security. She enjoys helping victims of computer virus infections remove them and successfully deal with the aftermath of the attacks. But most importantly, Violet makes it her priority to spend time educating people on privacy issues and maintaining the safety of their computers. It is her firm belief that by spreading this information, she can empower web users to effectively protect their personal data and their devices from hackers and cybercriminals.

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