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Yontoo adware

Also Known As: Yontoo Virus
Type: Adware
Damage level: High

What is Yontoo?

Yontoo is a company that develops browser add-ons and web applications. Their products include web apps such as Best Video Downloader (a web app that allows users to download videos from YouTube), PageRage (an app that allows users to change Facebook layouts), EasyInline (an app that enables the highlighting of text and provides options to search across various popular resource sites), and many others.

While the idea of enhancing your Internet browsing experience with various browser add-ons and plug-ins is valid, Yontoo apps are ad-supported and thus employ some deceptive methods to display them. For example, after installing Best Video Downloader, visitors to YouTube will notice that the ads no longer originate from Google - the Yontoo app overrides them with its own.

Yontoo adware homepage Yontoo installation via best video downloader

It is important to note that downloading YouTube videos in this manner does not comply with copyright law, and furthermore, ads shown within YouTube after installing Best Video Downloader app can compromise the security of your PC and your privacy. Some of these ads will request users to complete online forms in order to claim a scam prize. Dubious ads such as these could also result in the installation of unwanted applications or even malware.

When any Yontoo apps are installed on your Internet browsers, the displayed ads relating to searches no longer originate from Google. Yontoo overrides them with Buzzdock ads. Google is a reputable company, which spends a great deal of time and money to filter out ads that could harm your computer or invade your privacy. Note that it is not advisable to allow third party ads imposed in your browsers to replace original Google ads.

If you have willingly installed Yontoo and are happy with the free services, then no action is necessary, however, be cautious when clicking ads displayed in YouTube and Google. If you are concerned about your computer's security and your own privacy, remove this app from your PC. Use the removal guide provided to help eliminate Yontoo from your computer.

Why you should remove Yontoo from your computer:

  • Yontoo overrides your Internet browsers and displays deceptive ads
  • Slower Internet browsing experience
  • Yontoo is detected as adware, a Trojan, or as an unwanted application by most legitimate antivirus vendors

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Quick menu:

Yontoo removal:

Windows 11 users:

Accessing Apps and Features in Windows 11

Right-click on the Start icon, select Apps and Features. In the opened window search for the application you want to uninstall, after locating it, click on the three vertical dots and select Uninstall.

Windows 10 users:

Accessing Programs and Features (uninstall) in Windows 8

Right-click in the lower left corner of the screen, in the Quick Access Menu select Control Panel. In the opened window choose Programs and Features.

Windows 7 users:

Accessing Programs and Features (uninstall) in Windows 7

Click Start (Windows Logo at the bottom left corner of your desktop), choose Control Panel. Locate Programs and click Uninstall a program.

macOS (OSX) users:

Uninstall app in OSX (Mac)

Click Finder, in the opened screen select Applications. Drag the app from the Applications folder to the Trash (located in your Dock), then right click the Trash icon and select Empty Trash.

yontoo uninstall

In the uninstall programs window, look for "Yontoo", select this entry and click " Uninstall" or "Remove"

After uninstalling Yontoo, scan your computer for any remaining unwanted components or possible malware infections. Recommended malware removal software.

Yontoo removal from browsers:

Video showing how to remove potentially unwanted browser add-ons:

Internet Explorer logoRemove malicious add-ons from Internet Explorer:

yontoo Internet Explorer

Click on the "gear" icon Internet Explorer options icon (at the top right corner of Internet Explorer) select "Manage Add-ons". Look for Yontoo related entries (Yontoo Api, Yontoo) and disable them.

Optional method:

If you continue to have problems with removal of the yontoo virus, reset your Internet Explorer settings to default.

Windows XP users: Click Start, click Run, in the opened window type inetcpl.cpl In the opened window click the Advanced tab, then click Reset.

Resetting Internet Explorer settings to default on Windows XP

Windows Vista and Windows 7 users: Click the Windows logo, in the start search box type inetcpl.cpl and click enter. In the opened window click the Advanced tab, then click Reset.

Resetting Internet Explorer settings to default on Windows 7

Windows 8 users: Open Internet Explorer and click the gear icon. Select Internet Options.

Reseting Internet Explorer settings to default in Windows 8 - accessing

In the opened window, select the Advanced tab.

Resetting Internet Explorer settings to default on Windows 8 - Internet options advanced tab

Click the Reset button.

Resetting Internet Explorer settings to default on Windows 8 - click the Reset button in the Internet options advanced tab

Confirm that you wish to reset Internet Explorer settings to default by clicking the Reset button.

Resetting Internet Explorer settings to default on Windows 8 - confirm settings reset to default by clicking the reset button

Google Chrome logoRemove malicious extensions from Google Chrome:

yontoo Google Chrome

Click the Chrome menu icon Google Chrome options icon (at the top right corner of Google Chrome) select "Tools" and click on "Extensions".  Locate "Yontoo", select it and click on the trash can icon.

Optional method:

If you continue to have problems with removal of the yontoo virus, reset your Google Chrome browser settings. Click the Chrome menu icon Google Chrome menu icon (at the top right corner of Google Chrome) and select Settings. Scroll down to the bottom of the screen. Click the Advanced… link.

Google Chrome settings reset step 1

After scrolling to the bottom of the screen, click the Reset (Restore settings to their original defaults) button.

Google Chrome settings reset step 2

In the opened window, confirm that you wish to reset Google Chrome settings to default by clicking the Reset button.

Google Chrome settings reset step 3

Mozilla Firefox logoRemove malicious plugins from Mozilla Firefox:

yontoo mozilla firefox

Click on the Firefox menu firefox menu icon (at the top right corner of the main window) select "Add-ons". Click on "Extensions" and disable "Yontoo".

Optional method:

Computer users who have problems with yontoo virus removal can reset their Mozilla Firefox settings.

Open Mozilla Firefox, at the top right corner of the main window, click the Firefox menu, firefox menu icon in the opened menu, click Help.

Accessing settings (Reset Firefox to default settings step 1)

Select Troubleshooting Information.

Accessing Troubleshooting Information (Reset Firefox to default settings step 2)

In the opened window, click the Refresh Firefox button.

Clicking on Refresh Firefox button (Reset Firefox to default settings step 3)

In the opened window, confirm that you wish to reset Mozilla Firefox settings to default by clicking the Refresh Firefox button.

Confirm your want to reset Firefox settings to default (Reset Firefox to default settings step 4)

safari browser logoRemove malicious extensions from Safari:

removing adware from safari step 1 - accessing preferences

Make sure your Safari browser is active, click Safari menu, and select Preferences....

removing adware from safari step 2 - removing extensions

In the opened window click Extensions, locate any recently installed suspicious extension, select it and click Uninstall.

Optional method:

Make sure your Safari browser is active and click on Safari menu. From the drop down menu select Clear History and Website Data...

resetting safari step 1

In the opened window select all history and click the Clear History button.

resetting safari step 2

Microsoft Edge (Chromium) logoRemove malicious extensions from Microsoft Edge:

Removing adware from Microsoft Edge step 1

Click the Edge menu icon Microsoft Edge (chromium) menu icon (at the upper-right corner of Microsoft Edge), select "Extensions". Locate all recently-installed suspicious browser add-ons and click "Remove" below their names.

Removing adware from Microsoft Edge step 2

Optional method:

If you continue to have problems with removal of the yontoo virus, reset your Microsoft Edge browser settings. Click the Edge menu icon Microsoft Edge (chromium) menu icon (at the top right corner of Microsoft Edge) and select Settings.

Microsoft Edge (Chromium) reset step 1

In the opened settings menu select Reset settings.

Microsoft Edge (Chromium) reset step 2

Select Restore settings to their default values. In the opened window, confirm that you wish to reset Microsoft Edge settings to default by clicking the Reset button.

Microsoft Edge (Chromium) reset step 3

  • If this did not help, follow these alternative instructions explaining how to reset the Microsoft Edge browser.

Summary:

declining installation of adware while downloading free software sampleCommonly, adware or potentially unwanted applications infiltrate Internet browsers through free software downloads. Note that the safest source for downloading free software is via developers' websites only. To avoid installation of adware, be very attentive when downloading and installing free software. When installing previously-downloaded free programs, choose the custom or advanced installation options – this step will reveal any potentially unwanted applications listed for installation together with your chosen free program.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Removal Instructions in other languages
Software uninstall instructions
Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Yontoo Virus QR code
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