Koti Virus


Koti is what is identified by cyber security experts as a file-encrypting ransomware variant. This means that Koti applies encryption on the files of its victims to make them inaccessible.

Koti Virus

The KOTI virus file encryption

The idea here basically revolves around a classic blackmail scheme, in which the victims’ files are held hostage in demand for a certain amount of money as ransom. Hence, the name of this malicious software category. The files are in essence rendered unreadable to any type of software, and therefore once they’ve been encrypted, unless you’re in possession of a special decryption key, you won’t be able to use them.

In turn, this decryption key is what the criminals behind the ransomware promise to send their victims after they’ve complied with the ransom demands. However, whether or not they will indeed send you a key once you’ve paid them is still questionable. It certainly wouldn’t be unprecedented for the hackers to vanish and you to never hear from them again. And in some instances, even if you are sent a key, there’s no telling whether or not it’s the correct one. Each instance of encryption requires its own unique key, so mixups can and do happen.

With this in mind, it’s a much better idea to try and resolve this problem using alternative measures. For one, removing Koti is of crucial importance – regardless whether you choose to deal with the hackers or not. This will ensure that at least no new files or potentially recovered ones get encrypted henceforth.

But after you have taken care of this, there are a number of ways in which you can try to get ahold of your locked data. We’ve put together a detailed removal guide just below this post to help you effectively eliminate this ransomware virus. And in the second part of the guide, we have also included these alternative file recovery methods that you can try.

The Koti virus

The Koti virus is a malicious piece of software that is capable of working under the radar of most antivirus programs. The encryption used by the Koti virus is essentially not harmful and therefore it usually won’t trigger your antivirus software.

Furthermore, some of the more advanced ransomware versions can actually even disable your antivirus program – just to make sure that it won’t interfere with its dirty business. This, as well as the complexity of the encryption itself, has greatly contributed to ransomware being considered the most dangerous type of malware out there. And with the rates at which ransomware is growing in popularity, it’s up to each and every user to do everything in their power to withstand it.

Namely, try avoiding such infections by staying away from their probable sources. These mainly include pirated software, spam messages and fake online ads. But even more importantly, keep backups of your valuable files on a separate drive or cloud.

The Koti file extension

The Koti file extension is visible at the end of each encrypted file name. The Koti file extension is pretty much what ensures that no software can recognize the data format.



Name Koti
Type Ransomware
Danger Level High (Ransomware is by far the worst threat you can encounter)
Symptoms Very few and unnoticeable ones before the ransom notification comes up.
Distribution Method From fake ads and fake system requests to spam emails and contagious web pages.
Data Recovery Tool Not Available
Detection Tool

Remove Koti Ransomware

Koti 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).

Koti Virus


Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 

Koti 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.
Koti Virus
Drag and Drop File Here To Scan
Koti Virus
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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.

    Koti 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:

    Koti Virus

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

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

    Koti Virus

    Go in Startup —> Uncheck entries that have “Unknown” as Manufacturer.

    • Please note that ransomware may even include a fake Manufacturer name to its process. Make sure you check out every process here is legitimate.

    Koti Virus

    Type Regedit in the windows search field and press EnterOnce inside, press CTRL and F together and type the virus’s Name. 

    Search for the ransomware  in your registries and delete the entries. Be extremely careful –  you can damage your system if you delete entries not related to the ransomware.

    Type each of the following in the Windows Search Field:

    1. %AppData%
    2. %LocalAppData%
    3. %ProgramData%
    4. %WinDir%
    5. %Temp%

    Delete everything in Temp. The rest just check out for anything recently added. Remember to leave us a comment if you run into any trouble!

    Koti Virus 

    How to Decrypt Koti files

    We have a comprehensive (and daily updated) guide on how to decrypt your files. Check it out here.

    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.


    • Hi, I watched the video, and I have a couple of things that I would like you to help me with.
      First, the startUp application you used to delete files I can’t find it in the search so I deleted them by searching everywhere and deleting recent files
      Second, when i opened regedit.exe I couldn’t find the windows -> rename file “I couldn’t find it”
      Third, at the last step when you reopen the device, when it opened the same errors where still there and my windows defender can’t remove these errors
      Forth, so when I checked the damaged files nothing has changed
      Question 1:what should I do next
      Question 2: would formatting the local disks actually remove the virus without re-downloading new windows
      P. S. My windows is 10 pro
      And thank you for your consideration

      • Hi Doaa Abo-Alia,
        One of the ways to find the startup folder is by opening the Run dialog box by pressing Windows key + R and after that type this exact line and click OK: shell:common startup

        When you get to Regedit.exe you can open a search bar by pressing Ctrl + F to find the locations you need to check. Navigate to the directory shown in the video and while you are on that part a blue pop up will appear listing more locations you have to check by using the search bar.

        By formatting any hard drive not containing your Operating System (OS) you will only lose your personal files which are encrypted and the virus will remain in your PC. For now the best thing you can do is remove the ransomware virus from your OS and transfer your encrypted files to a different hard disk to wait for a decryption tool to be released so you can try and recover them.
        Please let us know if this information was helpful.

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