What is KingOuroboros ransomware? And how does it carry out its attack?

KingOuroboros ransomware is a data-encrypting malware that aims to lock files in a computer and extort money from victims in exchange for file recovery. Once it is able to infect a targeted machine, it will perform a series of malicious activities to carry out its attack. It starts by dropping its malicious payload which will connect to a remote Command and Control server. In this remote server controlled by the crooks behind KingOuroboros ransomware, the malicious payload will download additional files and place them to system folders. These malicious files are used to launch new processes and repress existing ones that could interfere with the attack. It may also use these files to alter some registry keys and sub-keys in the Windows Registry in order to achieve persistence. After these changes are applied, it will scan the computer for files with the following extensions:
Once it finds the files with the aforementioned formats, it will encrypt them using a strong encryption algorithm and append the extension, .king_ouroboros on each one of the affected files. After that it displays a program window it calls “Delta” containing its ransom note that states:
“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 [email protected] Your ID:
We will provide you with payment address and your decryption key.
You have 72 Hours to complete the payment otherwise your key will be deleted.”
How does KingOuroboros ransomware spread online?
At the time of writing, it is still unclear what kind of distribution method cybercrooks behind KingOuroboros ransomware uses. However, they might utilize the most common distribution method for ransomware threats – spam emails. Thus, you have to double check any emails before you open them and their attachments as it might contain the malicious payload of KingOuroboros ransomware.
To successfully eliminate KingOuroboros ransomware from your computer, refer to the removal guide laid out below.
Step 1: Launch the Task Manager by simply tapping Ctrl + Shift + Esc keys on your keyboard.
Step 2: Under the Task Manager, go to the Processes tab and look for the process of the program window named “Delta” and any suspicious-looking process which takes up most of your CPU’s resources and is most likely related to KingOuroboros ransomware.

Step 3: After that, close the Task Manager.
Step 4: Tap Win + R, type in appwiz.cpl and click OK or tap Enter to open Control Panel’s list of installed programs.
Step 5: Under the list of installed programs, look for KingOuroboros ransomware or anything similar and then uninstall it.

Step 6: Next, close Control Panel and tap Win + E keys to launch File Explorer.
Step 7: Navigate to the following locations below and look for KingOuroboros ransomware’s malicious components such as “[random].exe”, “Delta.exe, and other suspicious files, then delete all of them.

  • %TEMP%
  • %WINDIR%\System32\Tasks
  • %APPDATA%\Microsoft\Windows\Templates\
  • %USERPROFILE%\Downloads
  • %USERPROFILE%\Desktop

Step 8: Close the File Explorer.
Before you proceed to the next steps below, make sure that you are tech savvy enough to the point where you know exactly how to use and navigate your computer’s Registry. Keep in mind that any changes you make will highly impact your computer. To save you the trouble and time, you can just use [product-name], this system tool is proven to be safe and excellent enough that hackers won’t be able to hack into it. But if you can manage Windows Registry well, then, by all means, go on to the next steps.
Step 9: Tap Win + R to open Run and then type in regedit in the field and tap enter to pull up Windows Registry.

Step 10: Navigate to the following path:

  • HKEY_CURRENT_USER\Control Panel\Desktop\
  • HKEY_USERS\.DEFAULT\Control Panel\Desktop\
  • 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

Step 11: Delete the registry keys and sub-keys created by KingOuroboros ransomware.
Step 12: Close the Registry Editor and empty the Recycle Bin.
Try to recover your encrypted files using the Shadow Volume copies
Restoring your encrypted files using Windows’ Previous Versions feature will only be effective if KingOuroboros ransomware hasn’t deleted the shadow copies of your files. But still, this is one of the best and free methods there is, so it’s definitely worth a shot.
To restore the encrypted file, right-click on it and select Properties, a new window will pop-up, then proceed to Previous Versions. It will load the file’s previous version before it was modified. After it loads, select any of the previous versions displayed on the list like the one in the illustration below. And then click the Restore button.

Complete the removal process of KingOuroboros ransomware by using a trusted and reliable program like [product-name]. Refer to the following guidelines on how to use it.
Perform a full system scan using [product-code]. To do so, follow these steps:

  1. Turn on your computer. If it’s already on, you have to reboot
  2. After that, the BIOS screen will be displayed, but if Windows pops up instead, reboot your computer and try again. Once you’re on the BIOS screen, repeat pressing F8, by doing so the Advanced Option shows up.

  1. To navigate the Advanced Option use the arrow keys and select Safe Mode with Networking then hit
  2. Windows will now load the SafeMode with Networking.
  3. Press and hold both R key and Windows key.

  1. If done correctly, the Windows Run Box will show up.
  2. Type in the URL address, [product-url] in the Run dialog box and then tap Enter or click OK.
  3. After that, it will download the program. Wait for the download to finish and then open the launcher to install the program.
  4. Once the installation process is completed, run [product-code] to perform a full system scan.

  1. After the scan is completed click the “Fix, Clean & Optimize Nowbutton.
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