Yontoo “Malware”


In the event that you’ve been infected with a program called Adware Yontoo, then your browser has probably become flooded with popups, banners, box messages and various other online ads by now. And it’s of little difference whether you use Chrome, Firefox, Edge or a different browser – most of the popular ones are all prone to such infections.

That’s not to say that you’re done for now. Much on the contrary, you can easily rid yourself of all the annoying and invasive ads that just never cease to appear. And as a matter of fact, we’ve prepared a very detailed yet simple removal guide, which will help you locate and delete all the necessary Adware Yontoo files from your system. However, before you head on to the removal guide, it is our sincerest recommendation that you continue reading the information within this article, so as to gain better insight into the nature of this program and adware in general. It will help you better recognize risks from now and potentially protect your PC from more dangerous programs.

What is Yontoo?

If you have a look at the word ‘adware’ it shouldn’t be too difficult to discern where it comes from. But we’ll break it down for you: adware basically means advertising software. You may have deduced as much from the many popups and banners that have started covering your screen since it appeared on your PC. So, the point of programs like Adware Yontoo is to generate as many ads as possible, so as to gain exposure for different products services. At the same time, these programs also help generate revenue for their developers. And this, in turn, happens typically when users click on the said online ads. Remuneration models like the famous Pay Per Click scheme are what ensures that this whole process works and benefits both sides: the people vested in getting their products and services promoted and the adware developers.

That’s why the ads are often so aggressive and intrusive. That’s also why sometimes attempting to close them results in new ones opening and other such annoying instances. But aside from that, the developers also employ a secret weapon, which you won’t notice unless you know of it. The thing is that programs like Adware Yontoo are often designed with the ability to look through your browsing history and analyze it. For example, they can take into consideration the type of websites you like to hang around most, as well as your latest online search requests. Furthermore, they can even monitor your social media activity and take note of the things you tend to like and share. All of this information combined allows the adware to determine which of its ads are likely to be more interesting to you. Then, based on the performed research, it will usually modify the display of ads, so as to match your preferences and potentially attract more of your clicks. In fact, you may have noticed this yourself if you pay attention to the ads.

But that’s not the scariest thing that can come as a result of Adware Yontoo’s presence on your machine. While it’s an invasive practice to say the least, it’s not necessarily a harmful one. But the adware’s ability to expose you to serious online threats like viruses, Trojans and ransomware is surely something worth considering. This can happen indirectly, as a result of the modifications that adware programs often initiate in your Registry. These modifications can subsequently make your system more vulnerable to external threats, and that’s all any virus or malicious program really needs to infect you. In addition, with so many ads constantly flooding your screen and you struggling to close them and just navigate the websites you need, you may run into the so-called malvertisements. These are fake ads used by hackers and cybercriminals for the distribution of their malicious scripts.

In order to avoid all that it’s best to simply remove the source of all the ads and the annoying changes to your system – Adware Yontoo. From now on you’d also best be more careful with the kind of programs you download. This adware likely came bundled with one of them and you installed it without realizing it. Also, be sure to always customize the installation of any new program, so as to not have to deal with such unpleasant surprises in the future.


Name Yontoo
Type Adware
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Large numbers of popups, banners, box messages, in-text links and other online ads flooding your browser.
Distribution Method Mainly via program bundles that haven’t been installed with due attention.
Detection Tool

Adware Yontoo “Malware” Removal

If you are a Windows user, continue with the guide below.

If you are a Mac user, please use our How to remove Ads on Mac guide.

If you are an Android user, please use our Android Malware Removal guide.

Yontoo “Malware”

Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).

Yontoo “Malware”


Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab (the “Details” Tab on Win 8 and 10). Try to determine which processes are dangerous. 

Yontoo “Malware”

Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Yontoo “Malware”
Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at: https://howtoremove.guide/online-virus-scanner/

Scan Results

Virus Scanner Result
Yontoo “Malware”ClamAV
Yontoo “Malware”AVG AV
Yontoo “Malware”Maldet

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 

Yontoo “Malware”

Hold together the Start Key and R. Type appwiz.cpl –> OK.

Yontoo “Malware”

You are now in the Control Panel. Look for suspicious entries. Uninstall it/them.

Type msconfig in the search field and hit enter. A window will pop-up:

Yontoo “Malware”

Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.

Yontoo “Malware”

Hold the Start Key and R –  copy + paste the following and click OK:

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

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

Yontoo “Malware”

If there are suspicious IPs below “Localhost” – write to us in the comments.

Open the start menu and search for Network Connections (On Windows 10 you just write it after clicking the Windows button), press enter.

  1. Right-click on the Network Adapter you are using —> Properties —> Internet Protocol Version 4 (ICP/IP), click  Properties.
  2. The DNS line should be set to Obtain DNS server automatically. If it is not, set it yourself.
  3. Click on Advanced —> the DNS tab. Remove everything here (if there is something) —> OK.

Yontoo “Malware”

Yontoo “Malware”

  • After you complete this step, the threat will be gone from your browsers. Finish the next step as well or it may reappear on a system reboot.

Right click on the browser’s shortcut —> Properties.

NOTE: We are showing Google Chrome, but you can do this for Firefox and IE (or Edge).

Yontoo “Malware”

Properties —–> Shortcut. In Target, remove everything after .exe.

Yontoo “Malware”

Yontoo “Malware”  Remove Adware Yontoo from Internet Explorer:

Open IE, click  Yontoo “Malware” —–> Manage Add-ons.

Yontoo “Malware”

Find the threat —> Disable. Go to Yontoo “Malware” —–> Internet Options —> change the URL to whatever you use (if hijacked) —> Apply.

Yontoo “Malware” Remove Adware Yontoo from Firefox:

Open Firefoxclick  Yontoo “Malware”  ——-> Add-ons —-> Extensions.

Yontoo “Malware”

Find the adware/malware —> Remove.
Yontoo “Malware”Remove Adware Yontoo from Chrome:

Close Chrome. Navigate to:

 C:/Users/!!!!USER NAME!!!!/AppData/Local/Google/Chrome/User Data. There is a Folder called “Default” inside:

Yontoo “Malware”

Rename it to Backup Default. Restart Chrome.

Yontoo “Malware”

Type Regedit in the windows search field and press Enter.

Inside, press CTRL and F together and type the threat’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

  • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you 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.

Leave a Comment