Cloystercdn Virus


Cloystercdn is a form of potentially unwanted software that will target your main browser, hijack its homepage and toolbar, and spam it with uncontrolled page redirects. Cloystercdn is also likely to inject ads into the search results of the browser’s default search engine.

Cloystercdn Virus

The Cloystercdn virus will display pop up ads and messages

Such activity from a rogue app would likely seem like a serious problem to many users, especially to ones who have never before encountered similar browser-hijacking software. However, while the presence of Cloystercdn in the browser should certainly not be ignored and overlooked, there is no need to succumb to panic and take drastic measures such as reinstalling/resetting your OS. In most cases, you won’t even need to take your computer to a specialist to fix your browser hijacker issue. Instead, to remove Cloystercdn from your Chrome or Firefox (or other) browser, it should usually be enough to follow the instructions provided within the guide on the current page that you can find down below.

The Cloystercdn Virus

The goal of rogue apps like the Cloystercdn virus is mostly aimed towards making money through paid ads and site promotions, which explains why the Cloystercdn virus would continuously put obstructive ads and redirect you to sites you did not intend to go to. You see, a browser hijacker isn’t necessarily a highly harmful piece of malware like a Trojan or a ransomware virus.

This activity earns income for the developer of the unwanted app on the basis of the Pay-Per-View model. In other words, each time you visit a page or a site that the hijacker is advertising, you’d be earning revenue for the creators of the hijacker. Of course, this doesn’t make things any better. Even if Cloystercdn and Look-this.site isn’t actively trying to harm your system, you’d still be forced to put up with its advertising activities every time you start your browser, not to mention that some of the content that may get advertised on your screen might be less than safe.

As a matter of fact, the biggest problem associated with representatives of the browser hijacker category isn’t that they are annoying to have in the browser but that their uncontrolled site promotions and ad displays may eventually put your system at risk. There are certainly way more harmful forms of rogue software and malware on the Internet, including Trojan horses, file-targeting ransomware viruses, and stealthy data-stealing spyware infections but the main problem with Cloystercdn is that you may actually get exposed to such threats should the hijacker be allowed to stay on your computer for long.

You need to remove Cloystercdn

To stop the obstructive display of ads and the aggressive page redirects as well as to improve the overall security of your computer, we suggest that you take the necessary measures to uninstall the software that is behind all this. As we said earlier, we will help you do that with the below removal guide. It includes detailed manual instructions as well as a linked recommended removal tool capable of quickly locating and removing any data related to undesirable browser hijackers in the system.



Name Cloystercdn
Type  Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Typical symptoms could be the replacement of your browser’s search engine or the sudden generation of obstructive page redirects in the browser.
Distribution Method Methods that are normally used to spread hijacker apps are file bundles, misleading clickbait ads, and the numerous types of spam messages.
Detection Tool

Remove Cloystercdn Virus

To try and remove Cloystercdn 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 Cloystercdn extension (as well as any other unfamiliar ones).
  4. Remove Cloystercdn by clicking on the Trash Bin icon next to its name.
  5. Confirm and get rid of Cloystercdn and any other suspicious items.

If this does not work as described please follow our more detailed Cloystercdn 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

Cloystercdn Virus

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).

Cloystercdn Virus


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. 

Cloystercdn Virus

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

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.
Cloystercdn Virus
Drag and Drop File Here To Scan
Cloystercdn Virus
Analyzing 0 s
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.

    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. 

    Cloystercdn Virus

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

    Cloystercdn Virus

    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:

    Cloystercdn Virus

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

    Cloystercdn Virus

    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:

    Cloystercdn Virus

    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.

    Cloystercdn Virus

    Cloystercdn Virus

    • 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).

    Cloystercdn Virus

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

    Cloystercdn Virus

    Cloystercdn Virus  Remove Cloystercdn from Internet Explorer:

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

    Cloystercdn Virus

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

    Cloystercdn Virus Remove Cloystercdn from Firefox:

    Open Firefoxclick  Cloystercdn Virus  ——-> Add-ons —-> Extensions.

    Cloystercdn Virus

    Find the adware/malware —> Remove.
    Cloystercdn VirusRemove Cloystercdn from Chrome:

    Close Chrome. Navigate to:

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

    Cloystercdn Virus

    Rename it to Backup Default. Restart Chrome.

    Cloystercdn Virus

    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.

    Leave a Comment