WinHoster is a dangerous Trojan Horse virus that rarely causes any symptoms and can infect most computers without users finding out. Once in the system, WinHoster quickly gains Admin rights and begins to execute a number of harmful processes.


The WinHoster comes with advanced malicious abilities that can help it sneak inside any system

Sometimes not even a good antivirus can detect all the threats that can hack into your computer – either because it is not working as it should (because of the malware itself) or because you have encountered a new malware that is powerful enough to overcome its defenses and that can’t be recognized by the malware definitions that the security program has at the moment. One such new malware is WinHoster – a Trojan Horse virus which comes with advanced malicious abilities that can help it sneak inside any system without being noticed. It is not easy to protect your PC from such a threat because there usually are no symptoms that can raise your attention neither during the infection nor after the malware has compromised the machine. The unusual system behavior, if there is any, in most of the, cases may go unnoticed or be mistaken for some regular system instability (we all get occasional computer slow-downs), rather than being seen as a security breach in the machine itself.

It is because of this that the Trojan-based threats are so dreaded and difficult to remove. In this post, however, we will do our best to provide you with some help with identifying those threats as soon as possible and removing them before they have done something bad to your computer.

For instance, some of the possible signs that might potentially help you spot the presence of a Trojan like WinHoster on your system early on, could be related finding out that your Firewall and antivirus have been disabled or do not work as they should. For example, you may try to perform a routine system scan on your computer and notice that your antivirus is simply not turned on or that it gives you an errors when you launch the scan. This could be because there is a malware in the background that is trying to block those programs. In such cases, the purpose of the malware is to make your security software incapable of catching the current infection or to ensure that other malware programs such Ransomware, Spyware or Rootkits do not get spotted.

Another thing you should question is if some obscure security program (or another piece of software) that you have never installed and you are sure that you have not downloaded yourself jumps on your screen, telling you that your computer is infected or you need urgent updates. In many cases, Trojans may pretend to be some useful program, an add-on or an application that may prompt you to click on different tempting links with the idea to “help” you optimize, analyze or clean your system, which, in fact, can introduce more malware or activate other harmful activities in the background. If such a thing happens to you, be wary of offers that are too good, avoid accepting those offers and clean up any traces of those programs that exist on your computer. Other possible indications of malicious activity could be sudden site redirects, excessive usage of RAM or CPU resources or of Internet bandwidth without much of interaction from your side, suspicious emails and posts on your social network accounts that you haven’t made yourself as well as others.

How to protect yourself?

Since, oftentimes, you can’t really be certain about the exact symptoms and the outcomes of an infection with a Trojan Horse like WinHoster, the best way to catch it is to use reliable security software. A manual removal guide like the one below can also be invaluable if you need assistance in detecting and deleting the harmful files. However, if you are an inexperienced user, we highly recommend that you use the instructions in the guide in a combination with a professional removal tool to prevent accidental system corruption.


Name WinHoster
Type Trojan
Danger Level  High (Trojans are often used as a backdoor for Ransomware)
Symptoms  System errors, higher than usual CPU or RAM usage, or no visible symptoms at all.
Distribution Method  Spam, infected email attachments, illegal websites, fake ads, misleading links, torrents.
Detection Tool

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Remove WinHoster Virus

If you are looking for a way to remove WinHoster you can try this:

  1. Click on the Start button in the bottom left corner of your Windows OS.
  2. Go to Control Panel -> Programs and Features -> Uninstall a Program.
  3. Search for WinHoster and any other unfamiliar programs.
  4. Uninstall WinHoster as well as other suspicious programs.

Note that this might not get rid of WinHoster completely. For more detailed removal instructions follow the 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. 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. If you see a screen like this when you click Uninstall, choose NO:



    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.

    • Remember this step – if you have reason to believe a bigger threat (like ransomware) is on your PC, check everything here.

    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.


    Type Regedit in the windows search field and press Enter.

    Once inside, press CTRL and F together and type the virus’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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