Prepona Info


Prepona is a type of browser-infecting malware that initially appears similarly to a browser extension but soon after installation hijacks the search engine and the homepage. Prepona is created for the purposes of web-advertising and will spam you with different ads and site-redirects.


The Prepona virus is invasive and ad-generating piece of software

A particular kind of software apps is in most cases the cause behind any excessive or nagging browser adverts, especially if the latter aren’t attached to a certain webpage. Prepona is one such invasive and ad-generating piece of software. What you’re dealing with is known as browser hijacker software and it’s been the cause for many users’ aggravation for quite some time now. A lot of browser hijacker programs get installed together with other useful programs but this isn’t always the case. Any software that carries obstructive amounts of advertisements integrated in it could be labelled as a browser hijacker. One certain way to tell if an application is a browser hijacker is to decide whether the benefits it gives are worth putting up with the adverts it creates. Browser hijacker programs are undoubtedly what you might regard as unwanted in this situation. The best course of action when we’re talking about browser hijackers is to remove it from your PC as soon as possible and our guide will help with that.

Prepona info

An especially frequent misunderstanding is to mistake a Prepona info for a computer virus since the latter happens to be a frequently used word for all that could possibly go wrong with a computer. To make the difference between Prepona info and viruses, remember that the representatives of the latter category are ultimately lawful and mostly harmless while the computer viruses are used in cyber crimes, for example data robbery and espionage.

Currently, by far the most harmful and often encountered malicious program family is known as Ransomware. Ransomware will definitely cause all the target’s private files to become unusable until a ransom is handed over. Anyone worried that Prepona may be a scary virus can relax now – the browser hijackers can usually be eradicated without major negative effects. We do not, however, say that you should keep nagging browser hijackers similar to Prepona installed on your system – exactly the opposite. Yet, it’s essential to take care of this threat while remaining relatively calm. The unfortunate truth is that many browser hijacker pieces are technically legal by the law and thus many anti-virus software programs will take no action against them.

Don’t be surprised when the advertisements you see on your monitor are overly-intrusive and aggressive – this is to be expected for almost all browser hijacker programs. It’s likely that you’d be unable to use your internet browser due to the constant barrage of pop-ups, box-messages and banners. A lot of people arrive at the conclusion that their machine has been infected by some sort of a dangerous virus after experiencing all those ads. As frustrating as the browser hijacker is, however, it is really not a malicious virus. You can tell if a program is malicious by looking at its behaviour and how it interacts with the data in the system. The goal behind most browser hijackers would be to generate as many ads as possible and also to make themselves hard to eradicate. Commonly, the browser hijackers function through installing some add-on element to your web browser that may be invisible and/or tricky to remove. You probably wonder why these programs are created to begin with. You see, the online advertising industry is really big and profitable right now. Generally, software applications such as Prepona and Captcha Filter make use of the so-called pay-per-click method, which gains revenue for the browser hijacker creator for each click any of the advertisements receive.


Name Prepona
Type  Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms  Pesky ads and banners covering your screen and random page-redirects landing you on unknown sites are commonly-encountered symptoms.
Distribution Method The ways these apps get distributed normally include the use of some sort of installation bundle or package as some other program as the main one in the setup.
Detection Tool

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Remove Prepona virus

To try and remove Prepona quickly you can try this:

  1. Go to your browser’s settings and select More Tools (or Add-ons, depending on your browser).
  2. Then click on the Extensions tab.
  3. Look for the Prepona extension (as well as any other unfamiliar ones).
  4. Remove Prepona by clicking on the Trash Bin icon next to its name.
  5. Confirm and get rid of Prepona and any other suspicious items.

If this does not work as described please follow our more detailed Prepona removal guide below.

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide


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).



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. 


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

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    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. 


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


    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:


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


    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:

    hosts_opt (1)

    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.



    • 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).


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

    Browser Hijacker Removal Instructions

    ie9-10_512x512  Remove Prepona from Internet Explorer:

    Open IE, click  IE GEAR —–> Manage Add-ons.

    pic 3

    Find the threat —> Disable. Go to IE GEAR —–> Internet Options —> change the URL to whatever you use (if hijacked) —> Apply.

    firefox-512 Remove Prepona from Firefox:

    Open Firefoxclick  mozilla menu  ——-> Add-ons —-> Extensions.

    pic 6

    chrome-logo-transparent-backgroundRemove Prepona from Chrome:

    Close Chrome. Navigate to:

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

    Rename the Folder to Backup Default

    Rename it to Backup Default. Restart Chrome.


    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


    Brandon Skies

    Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. Years of experience enable him to provide readers with important information and adequate solutions for the latest software and malware problems.

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