.king_ouroboros Files Virus (Delta) – How to Remove It and Restore Data

.king_ouroboros Files Virus (Delta) – How to Remove It and Restore Data

This article aims to help explain what is the Delta ransomware virus and show you how you can remove this ransomware infection from your computer plus how to restore encrypted files without paying ransom.

A new ransomware virus, going by the name .king_ouroboros has been detected by security researchers. The malware aims to encode the files on the computers and put an interfix extension .king_ouroboros in between the file name and the original suffix corresponding to it’s type. The malware displays a ransom note, demanding victims to pay $50 ransom to get their files to work once again. If your computer has been infected by the KingOuroboros ransomware we recommend that you read this article thoroughly, since it contains information on how you can remove this ransomware infection plus how you can restore your data.

Threat Summary

TypeRansomware, Cryptovirus
Short DescriptionAims to encrypt the files and hold them hostage until the victim pays $50 to the cyber-criminals.
SymptomsThe files on the affected computer are encrypted and no longer able to be opened. The file interfix .king_ouroboros is added to the encrypted files.
Distribution MethodSpam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by .king_ouroboros


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss .king_ouroboros.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

.king_ouroboros Files Ransomware – Distribution

The .king_ouroboros files virus is the type of ransomware virus which may enter your computer via more than one way. The main method which accounts to more than 80% of ransomware infections, like .king_ouroboros files virus use spam e-mails to infect computers. Such emails often pretend to be legitimate types of messages whose main goal is to deceive victims into either clicking on a malicious e-mail attachment or open a URL that causes the infection. The e-mails are designed so that they make it seem as if the malicious files are seemingly legitimate invoices, receipts and other forms of documents.

Furhtermore, besides this method, the ransomware creators may distribute the .king_ouroboros files virus as a result of different types of files that are directly uploaded online and pretending to be setups, patches, cracks, portable programs and many other files which users often download.

.king_ouroboros Files Virus – More Informaiton

The .king_ouroboros ransomware is the type of infection which aims to encrypt the files on the computers infected by it and then get users to pay ransom to get the files back. To read it’s end goal, the ransomware may go through different malicious activities it does on your computer. For starters upon infection, the .king_ouroboros ransomware may drop it’s malicious payload on the computers of victims:

  • %AppData%
  • %Local%
  • %LocalLow%
  • %Roaming%
  • %Temp%

After this is done, the .king_ouroboros files virus aims to perform multiple different types of actions, such as create mutants on your computer and interfere with the Run and RunOnce registry keys by creating entries in them with the location of the file encryption module which makes it to run on Windows Login. The sub-keys have the following locations:

→ HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

Once these Windows Registry sub-keys are modified, the .king_ouroboros files virus may also delete the backups on your computer and stop Windows Recovery services. This happens by running a script in Windows which executes some or all of the following commands in Windows Command Prompt:

→ sc stop VVS
sc stop wscsvc
sc stop WinDefend
sc stop wuauserv
sc stop BITS
sc stop ERSvc
sc stop WerSvc
cmd.exe /C bcdedit /set {default} recoveryenabled No
cmd.exe /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\System32\cmd.exe” /C vssadmin.exe Delete Shadows /All /Quiet

In addition to this, the ransomware virus may also drop and execute it’s ransom note, it calls Delta. The ransom note lookslike the following:

Text from image:

The only way you can recover your files is to buy a decryption key

The payment method is: Bitcoin. The price is: $50 = Bitcoins

After buying the amount of bitcoins send an email

to king.ouroboros@protonmail.com Your ID:

We will provide you with payment address and your decryption key.

You have 72 Hours to complete the payment oterwise your key will be deleted.

.king_ouroboros Ransomware – Encryption Process

In order to encrypt the files on your computer the .king_ouroboros file ransomware may check for the files beforehand. The files targeted by the ransomware are detected, based on their file extensions. The malware may scan for the most often used types of files, such as videos, documents, backups, images, audio files, archives and other files by checking the most often used file extensions:


After the files on the infected computer are encrypted, the ransomware virus may start to encrypt the files by overwriting data from their original structure code with encrypted data and then it ads the .king_ouroboros file interfix, making the encrypted files to appear like the following:

Remove .king_ouroboros Ransomware and Restore Your Files

In order for you to remove this virus from your computer, we recommend that you follow the manual and automatic removal instructions underneath this araticle. If manual removal represents a difficulty for you, it is reccomended to remove the .king_ouroboros ransomware automatically, preferrably by downloading and installing an advanced anti-malware software. Such program will effecitvely scan for the malicious files and remove them plus ensure that your computer is protected against future infections as well.

If you want to restore files, encrypted by .king_ouroboros ransomware, we advise that you try the alternative tools for file recovery underneath in step “2. Restore files, encrypted by .king_ouroboros Ransomware”.


Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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Windows Mac OS X

How to Remove .king_ouroboros from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove .king_ouroboros


Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall .king_ouroboros and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by .king_ouroboros on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by .king_ouroboros there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for .king_ouroboros with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.


If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by .king_ouroboros.

Ransomware infections and .king_ouroboros aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

If the above link does not work for you and your region, try the other two links below, that lead to the same product:


2. On the download page, click on the "Download" button:

3. Click on "Save File" button:

4. Accept all agreements and click "Next":

5. After all the "Next" steps, click on "Install" and then wait for the installation to complete:

6. Run the software. Click on the location to scan for missing or deleted files and click on "Scan":

7. Wait for the scan to complete, it may take some time. Be advised that this scan is not 100% guaranteed to recover all files, but it does have some chance to get your data back:

Windows Mac OS X

Get rid of .king_ouroboros from Mac OS X.

Step 1: Uninstall .king_ouroboros and remove related files and objects

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to .king_ouroboros:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to .king_ouroboros. If you find it, right-click on the app and select “Move to Trash”.

6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to .king_ouroboros. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove .king_ouroboros via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as .king_ouroboros. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Step 2: Scan for and remove .king_ouroboros files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as .king_ouroboros, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.

Step 3 (Optional): Try to Restore Files Encrypted by .king_ouroboros on your Mac.

Ransomware for Mac .king_ouroboros aims to encode all your files using an encryption algorithm which may be very difficult to decode, unless you pay money. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files, but only in some cases. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the recommended Data Recovery Mac app by clicking on the link underneath:

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