Contenko/ Contenko.com: what it is and how to remove it
Contenko is a browser hijacker that displays advertisements and sponsored links in search results on the browser. This program affects your online searches, so the hijacker can boost advertising revenue for the publisher and sponsor of this PUP.
Facts checked October 6, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
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Contenko/ Contenko.com: summary
| Distribution | Freeware installations, other PUPs, deceptive pages, and promotional content |
|---|---|
| Name | Contenko/ Contenko.com |
| Type | Browser hijacker |
| Symptoms | After the infiltration, this hijacker changes settings on the browser and sets the default search engine to Contenko.com, alters new tab and homepage preferences. This search engine shows results injected with sponsored content and redirects you to various commercial pages this way |
| Potential danger | Potentially unwanted programs can track and collect users browsing habits and information regarding the time online. This is the behavior that may result in privacy issues. The content that you get unwillingly exposed to also can lead to malware infiltrations |
| Detection names | No Microsoft detection name is known |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 6 more facts
| Damage | Not recorded in the old report |
|---|---|
| Evidence | 4 write-ups by security sites; details still limited |
| Search page | contenko.com |
| Browsers | Chrome, Edge and Firefox |
| First seen | 2 April 2021 |
| Facts checked | 6 October 2026 |
Is Contenko/ Contenko.com dangerous? What it collects
From our report of Apr 2021 · not reviewed since
Contenko is the search engine that changes settings on internet browsers and the search provider to promote related material
Contenko is a browser hijacker that displays advertisements and sponsored links in search results on the browser.
This program affects your online searches, so the hijacker can boost advertising revenue for the publisher and sponsor of this PUP. This potentially unwanted program relies on blackhat SEO and other deceptive, shady techniques to affect the ranking of certain commercial pages, generate views and visits that can be monetized later on.
All those redirects caused by Contenko virus are designed to achieve the goal of rerouting online traffic and exposing the user to needed commercial material. This is technically not a virus, only a potentially unwanted program or a browser threat, but intrusive behavior makes people frustrated and annoyed so they call the PUP a virus.
This browser hijacker interferes with users' experience and shows tons of ad-supported sites instead of providing proper results, so there is nothing valuable that this hijack provides and you can remove it from the machine.
Contenko browser hijacker is nothing put a redirects-based program that focuses on monetization. The PUP exhibits malicious traits and can interfere with the performance, even more, when it installs other PUPs without permission or alters system settings. Experts note that you need to take this into consideration and get rid of the hijacker as soon as possible because it can change registry and startup preferences.
Contenko is not providing any useful in-browser search results once it alters the default settings and even installs toolbars or extensions on Google Chrome, Internet Explorer, Mozilla Firefox, Safari, or any other browsers. It modifies custom settings and affects the load time threshold, places lock files on Firefox and prevents other software from altering those settings.
Contenko.com can even disable some features and functions to allow different installations. All the deceptive sites that you get exposed to can be set to promote ofter software and trigger automatic downloads of plugins, browser extensions, toolbars.
To remove Contenko.com completely and forget about the redirects, pop-ups, you need a thorough system scan. Since this is the program that came via freeware installations, you cannot be sure that other PUPs haven't got installed during the same infiltration. So anti-malware tools like or can detect and remove them all during an automatic scan on the computer.
Users that encounter the browser hijacker on the machine complain about the difficult Contenko removal that is affected by all the associated programs scattered throughout the system and folders. Also, this PUP can easily alter startup preferences, Windows registry entries and make the hijack more persistent, so you need to get automatic tools and terminate all background processes completely.
Contenko is a potentially unwanted program, which may cause various issues for PC users. In most of the cases, they report about the unwanted discovery of this website instead of their homepage and default search engine or commercial pop-up ads that show up every time they start their browsing.
While it may seem that your homepage was replaced by a normal search site, we can't guarantee that you will receive trustworthy search results. In most cases, Contenko.com returns altered search results that promote related websites or show paid ads in the first place.
That's why we always recommend relying only on such reputable search engines as Google, Yahoo, or Bing. Besides, you should remove Contenko from your machine if you want to stop the previously mentioned activities.
Do not forget about pieces that PUP affects directly like registry, system folders. You need to repair the damage there too. Get the or a similar tool for that and clean the system fully.
From our report of Apr 2021 · not reviewed since
Browser hijackers and adware infiltrate the system via other PUPs and deceptive sites
You may discover suspicious search engines or different browser programs on your computer after installing freeware or shareware, such as various PDF creators, download managers, video converters, and similar software.
In order to avoid that, you have to monitor the installation process of such programs every time you download anything from the internet.
If you fail to do that, you may also discover this unfair search engine on your PC one day. Once it enters a computer, the rogue program occupies all Internet browsers and starts its annoying routine. Once again, we can't call this program a virus because it doesn't harm computers. However, you shouldn't trust this search results because it seeks the only thing - collect sales.
You can avoid the infiltration of PUP by choosing professional anti-malware tools that can run on the machine and block potential threats, go for official software providers for your programs and tools. Also, the best solution is to go for Advanced or Custom installation options every time you get freeware, so you can deselect extra offers and see all the additional programs included on the setup.
From our report of Apr 2021 · not reviewed since
More from our earlier report on Contenko/ Contenko.com
- Anti-malware tools can help with the process of cleaning the device
- Run after the proper threat removal, so you can improve the performance
Check your browser and PC
- Address:
contenko.com
How to remove Contenko/ Contenko.com
How to remove Contenko/ Contenko.com and get your search engine back
Remove the extension first.
The search settings only stay fixed once nothing on the PC can change them again.
Step 1: Remove extensions you did not add
In Chrome open
chrome://extensions, in Edgeedge://extensions, and in Firefox the menu > Extensions and themes.Remove every extension you do not remember adding, especially search, new tab, coupon, PDF, weather or video downloader add-ons. Check every browser and every profile, because each keeps its own list.
If an extension has no Remove button or comes back, a browser policy holds it (see "Managed by your organization" in the procedure below). The pages are the same on Windows 11 and Windows 10.
Chrome on Windows 11: More > Extensions > Manage extensions. Full procedure with screenshots: Remove a browser extension
Step 2: Put the search engine back and delete contenko.com
In Chrome open Settings > Search engine > Manage search engines and site search, make an engine you trust the default, and delete
contenko.comfrom the list.In Edge type
search engineinto the search box at the top of Settings and open Manage search engines; in Firefox use Settings > Search. Then check the homepage and the new tab page in the same settings, because hijackers change all three.If contenko.com is back after a restart, an extension, a program or a policy still sets it, so finish the other steps and check again. The settings are the same on Windows 11 and Windows 10.
Chrome on Windows 11: check Search engine and On startup. Full procedure with screenshots: Reset a browser and fix a hijacked search engine
Step 3: Uninstall programs you did not mean to install
Contenko/ Contenko.com rarely comes alone: it is usually installed by, or together with, a free program. In Windows 11 open Settings > Apps > Installed apps, in Windows 10 Settings > Apps > Apps & features, and sort by install date.
Uninstall every entry from the day the trouble began that you did not install on purpose, for example a download manager, a converter or a browser you never chose.
Keep drivers and entries from Microsoft, Intel, AMD, NVIDIA or your PC's maker unless you are sure.
Full procedure with screenshots: Uninstall a program or app in Windows On uGetFix
Step 4: Reset the browser
A reset removes what the steps above could miss:
- changed start pages
- site permissions
- hidden settings
In Chrome open Settings > Reset settings > Restore settings to their original defaults; in Edge Settings > Reset settings; in Firefox Help > More troubleshooting information > Refresh Firefox.
Tip: Bookmarks and saved passwords stay, while extensions are turned off and the search engine and start page return to the defaults.
Reset every browser on the PC, including Edge, which Windows 11 and Windows 10 always have.
Chrome on Windows 11: Settings > Reset settings. Full procedure with screenshots: Reset a browser and fix a hijacked search engine
Step 5: Scan the PC, then run the offline scan
A scan finds the parts of Contenko/ Contenko.com that the manual steps cannot see. In Windows Security > Virus & threat protection > Scan options, start a Full scan and quarantine what it reports.
Follow it with Microsoft Defender Antivirus (offline scan) > Scan now, which restarts the PC and checks the disk while Windows and the malware are not running.
It takes about 15 minutes and works the same in Windows 11 and Windows 10. If either scan finds something, run the full scan again after removal until it comes back clean.
Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Instructions for each browser and system
The detailed steps for every browser and system this guide covers. Open the one you use.
Uninstall from Windows
Clean the system from any Contenko traces left behind
Uninstall from Windows 10/8:
- Type Control Panel into the Windows search box and open the result.
- Under Programs, select Uninstall a program.
Uninstall from Windows 7/XP:
- Click on Windows Start > Control Panel (Windows XP users should click on Add/Remove Programs).
- In Control Panel, select Programs > Uninstall a program.
Remove the unwanted program:
- In the Programs and Features window, look for any recently installed suspicious entries, select them, and click Uninstall.
- If User Account Control appears, click Yes to confirm, then complete the removal.
Remove from Google Chrome
You should reset the browser fully to default, so all the changes get to be reversed
Delete malicious extensions from Google Chrome:
- Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
- In the newly opened window, you will see all the installed extensions. Uninstall all suspicious extensions related to the unwanted program by clicking Remove.
Clear cache and web data from Chrome:
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.
Change your homepage:
- Click menu and choose Settings.
- Look for a suspicious site in the On startup section.
- Click on Open a specific or set of pages and click on three dots to find the Remove option.
Reset Google Chrome:
If the previous methods did not help you, reset Google Chrome to eliminate all the unwanted components:
- Click on Menu and select Settings.
- In the Settings, scroll down and click Advanced.
- Scroll down and locate Reset and clean up section.
- Now click Restore settings to their original defaults.
- Confirm with Reset settings.
Remove from Microsoft Edge
Delete unwanted extensions from MS Edge:
- Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
- From the list, pick the extension and click on the Gear icon.
- Click Remove.
Clear cookies and other browser data:
- Click on the Menu (three horizontal dots at the top-right of the browser window) and select Settings > Privacy, search, and services..
- Under Clear browsing data, pick Choose what to clear.
- Select Cookies and other site data and Cached images and files. (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.
Restore new tab and homepage settings:
- Click the menu icon and choose Settings.
- Then find On startup section.
- Click Remove next to any suspicious startup page.
Reset MS Edge if the above steps did not work:
- Press on Ctrl + Shift + Esc to open Task Manager.
- Click on More details arrow at the bottom of the window.
- Select Details tab.
- Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.
Delete extensions from MS Edge (Chromium):
- Open Edge and click select Settings > Extensions.
- Delete unwanted extensions by clicking Remove.
Clear cache and site data:
- Click on Menu and go to Settings.
- Select Privacy, search and services.
- Under Clear browsing data, pick Choose what to clear.
- Under Time range, pick All time.
- Select Clear now.
Reset Chromium-based MS Edge:
- Click on Menu and select Settings.
- On the left side, pick Reset settings.
- Select Restore settings to their default values.
- Confirm with Reset.
- This will disable extensions and reset startup pages but will not delete bookmarks, saved passwords, or browsing history.
Remove from Mozilla Firefox (FF)
When Contenko installs other programs or in-browser applications, you need to eliminate all of them to get rid of the PUP entirely
Remove dangerous extensions:
- Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
- Select Add-ons.
- In here, select the unwanted extension and click Remove.
Reset the homepage:
- Click three horizontal lines at the top right corner to open the menu.
- Choose Settings.
- Under Home, set your preferred homepage and new tab settings.
Clear cookies and site data:
- Click Menu and pick Settings.
- Go to Privacy & Security section.
- Scroll down to locate Cookies and Site Data.
- Click on Clear Data...
- Select Cookies and Site Data and Temporary cached files and pages, then click Clear.
Reset Mozilla Firefox
If clearing the browser as explained above did not help, reset Mozilla Firefox:
- Open Mozilla Firefox browser and click the Menu.
- Go to Help and then choose Troubleshooting Information.
- Under Give Firefox a tune up section, click on Refresh Firefox...
- Once the pop-up shows up, confirm the action by pressing on Refresh Firefox.
Delete from Safari
Remove dangerous extensions:
- Open Safari, click Safari in the menu at the top-left of the screen, and select Preferences.
- Go to the Extensions tab, look for any suspicious entries, and click Uninstall to remove them.
Clear history and website data:
- Click Safari in the menu and pick Clear History.
- Set Clear to all history and confirm with Clear History.
Reset Safari:
- Click Safari in the menu and select Preferences > Advanced.
- Enable Show Develop menu in menu bar.
- From the menu bar, click Develop and select Empty Caches.
Delete from macOS
Remove the unwanted application:
- From the menu bar, select Go > Applications.
- In the Applications folder, look for any suspicious entries, then drag them to Trash (or right-click and pick Move to Trash).
Delete leftover files and folders:
- Select Go > Go to Folder.
- Enter /Library/Application Support and remove any suspicious folders related to the unwanted program.
- Repeat the same check in the /Library/LaunchAgents and /Library/LaunchDaemons folders, deleting any suspicious entries.
- Finally, empty the Trash to permanently remove the leftovers.
Protect your privacy - employ a VPN
There are several ways how to make your online time more private - you can access an incognito tab.
However, there is no secret that even in this mode, you are tracked for advertising purposes. There is a way to add an extra layer of protection and create a completely anonymous web browsing practice with the help of VPN. This software reroutes traffic through different servers, thus leaving your IP address and geolocation in disguise.
Besides, it is based on a strict no-log policy, meaning that no data will be recorded, leaked, and available for both first and third parties. The combination of a secure web browser and VPN will let you browse the Internet without a feeling of being spied or targeted by criminals.
No backups? No problem. Use a data recovery tool
If you wonder how data loss can occur, you should not look any further for answers - human errors, malware attacks, hardware failures, power cuts, natural disasters, or even simple negligence.
In some cases, lost files are extremely important, and many straight out panic when such an unfortunate course of events happen. Due to this, you should always ensure that you prepare proper data backups on a regular basis.
If you were caught by surprise and did not have any backups to restore your files from, not everything is lost. is one of the leading file recovery solutions you can find on the market - it is likely to restore even lost emails or data located on an external device.
From our report of Apr 2021 · not reviewed since
The elimination process involves manual and automatic Contenko removal steps
If you noticed redirections to Contenko.com, it means that the Contenko virus is inside your computer.
When the intruder runs on the machine it exposes you to possibly dangerous content and can lead to installations of other PUPs or even more dangerous malware.
You need to get rid of all the potential threats, files associated with this browser hijacker, or any other potentially unwanted program. Contenko removal requires additional steps for terminating intruders on each browser directly, so rely on the guide below.
To completely remove Contenko from the system, you should rely on scanning the machine using a professional anti-malware tool that is capable of detecting, indicating, and removing all the potential threats, corrupted files, or even malicious programs. Such a program cleans the machine further and helps to eliminate all virus damage by repairing certain system files.
Questions about Contenko/ Contenko.com
Is it safe to keep contenko.com as my search engine?
It is not recommended. Searches through contenko.com usually still return results, but the operator sees every query, often stores it with an identifier for your browser and shows extra ads or paid links. Some hijacked results lead to fake downloads or scam pages.
You also did not choose it, which means something changed your settings without asking and may still be installed. Set your own search engine back, remove the extension or program that set contenko.com, and check the browser's other settings, such as the start page and notification permissions, for further changes made at the same time.
Can contenko.com see my searches?
Yes. Every search typed into the address bar goes to contenko.com first, which is how it earns money. It can log the query, the time and an identifier for your browser, and some hijackers also collect the pages you visit through their extension.
The privacy policy of such sites usually allows sharing that data with partners. Once the hijacker is removed and your own search engine is set again, new searches no longer reach it. Searches already sent cannot be taken back, so avoid entering sensitive information until the clean-up is finished, and clear cookies afterwards.
What is contenko.com?
It is the search page used by the browser hijacker Contenko/ Contenko.com. It has no search index of its own: it forwards your queries to another search engine and adds ads and tracking along the way.
People rarely choose it on purpose; it becomes the default search engine, home page or new tab after an extension, program or policy changes the browser settings. The page itself is not malware, but it should not be in your browser if you did not set it. The steps above remove the source and restore your settings.
Is contenko.com dangerous?
It is not designed to infect the PC, but it is not neutral either. It logs searches, adds sponsored results that are hard to tell apart from real ones, and its ad partners are not checked as strictly as those of major search engines.
Some hijacker pages have shown ads for fake updates, tech support scams and unwanted software. The main harm is to privacy. Remove Contenko/ Contenko.com, and if you entered personal data on sites reached through its results, check those sites carefully.
Do I have to fix every browser?
Yes, every one where the search engine or start page changed. In the cases we checked, Contenko/ Contenko.com affected Chrome, Edge and Firefox.
Each browser stores its own search settings and extensions, so fixing one does not fix the others, and Windows-level changes such as shortcuts can affect each browser differently. Work through them one at a time:
- remove the extension
- check the policies
- restore the search engine
- start page
If you sync a browser, stay signed in so the fix spreads to your other computers.
Did contenko.com record my searches?
Almost certainly. Logging is the point of a hijacker search page: each query, with your IP address, browser details and the result you clicked, is valuable to advertisers.
The operators of contenko.com can store and share that data under their own privacy policy, which you never agreed to knowingly. There is no way to delete it from their side. What you can do is stop the flow:
- remove Contenko/ Contenko.com
- clear cookies and site data for contenko.com
- treat sensitive searches made in the meantime as known to a third party
Is only one browser affected?
Often not. Programs that install hijackers tend to change every browser they find, and sync can carry the extension to other computers signed in to the same browser account. Check Chrome, Edge and Firefox, even the ones you rarely use, and look at the shortcut targets on the desktop and taskbar for each.
If you use sync, remove the extension while signed in so the removal syncs too. Also check the On startup setting and the new tab page, because hijackers change those as well as the search engine.
What do I lose if I reset Chrome or Edge?
Less than you might think. A reset turns off all extensions, which you can turn back on one by one, restores the default search engine, home page, new tab and pinned tabs, and clears cookies, so you are signed out of most sites.
Bookmarks, history, saved passwords and autofill data stay. Firefox's equivalent, Refresh Firefox, keeps the same essentials but removes add-ons completely. Before you reset, make sure you know your main passwords or have them saved, since you will need to sign in again.
Can I just block contenko.com?
You can, but it treats the symptom. Blocking the domain in a firewall or the hosts file makes searches fail instead of redirecting, while the extension or program that set it keeps running and collecting data.
Hijacker operators also switch to new domains in updates, so a block may stop working within weeks. Remove the source instead, then set your own search engine. If you want extra protection afterwards, turn on Potentially unwanted app blocking in Windows Security, which stops many hijacker installers before they run.
Will Fortect remove Contenko/ Contenko.com?
Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.
For Contenko/ Contenko.com, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.
Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.
Sources
- Wired: Pop-up mobile ads surge as sites scramble to stop them (read October 6, 2026)
- FTC: How to recognize, remove and avoid malware (read October 6, 2026)
- Microsoft Learn: Microsoft Defender Offline (read October 6, 2026)
- Microsoft Learn: How Microsoft names malware (read October 6, 2026)