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Remove Ninja Ransomware and Restore Encrypted Files

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NameNinja Ransomware
TypeRansomware virus
Short DescriptionEncrypts vital user data leaving a ransom note with demands and ways to contact the cyber-criminals.
SymptomsMay change the homepage, wallpaper or leave a text document. May disable antivirus programs. Leaves files ‘corrupt’ with unfamiliar extensions.
Distribution MethodVia infected emails, dangerous redirects infected flash drives, etc.
Detection toolDownload Malware Removal Tool, to See If Your System Has Been Affected By Ninja Ransomware
User ExperienceJoin our forum to follow the discussion about Ninja Ransomware.
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.

Ninja Ransomware is a malware infection originating from Russia that is reported by ESG analysts to encrypt user files with the sole purpose of extorting users or money. The ransomware leaves a ransom note that promises to delete the decryption codes forever in case the affected user does not comply with the demands. Security professionals highly advise not to comply with them and immediately the necessary actions to isolate and remove the threat by disconnecting from the web and working offline. Ransomware infections have caused massive financial losses both to organizations and individuals worldwide and they are not to be taken lightly at all.

Ninja Ransomware – How Did I Get Infected?

One way to get infected by this vile threat to your computer is in case you open a mail with a dangerous attachment serving as a carrier for the malware. Some cybercrooks undertake spam email campaigns, such as the Fake Windows 10 Upgrade spam emails to conduct their attacks. The emails usually resemble reputable people or companies, increasing the trust in the user and thus the likely-hood of him clicking on them.

Another method of infection is in case the user inserts an infected flash drive in their computer that runs a script on Windows AutoPlay to automatically execute malicious files on the user PC.

Also, users may get this virus by downloading content from unknown torrent sites that may contain malware in the installation of a program, a key generator for cracking application, crack .exe’s and others.

Another method of getting the virus is by being a victim to a drive-by download. Drive-by downloads are administered by malicious sites and sometimes the user may be redirected to such by an adware PUP (Potentially Unwanted Program) on their computer.

Ninja Ransomware – More about It

Once executed on your computer, this threat may begin to browse for the following file formats in user PCs:

→doc, pdf, txt, etc, vdi, mp3, rec, mp4, avi and others.

Once it may have figured out which ones are most frequently opened by the user it encrypts them leaving an unknown format after that, such as the image below, for example:


The ransomware also leaves a ransom note as your wallpaper, home page or in a text document on the desktop, saying something similar to this:

“Your files have been encrypted. In case you want to restore them sent one file to this mail address:
WARNING!!! You have 1 week to comply and after this deadline the decryption of your files will be impossible.“

In case you see this message, experts advice to immediately disconnect your computer from the network since this is a trojan horse after all and it may still have the ability to erase your files. Also, do not comply in any way with the cyber criminals because there is no guarantee that they will decrypt your records. You should either seek professional support, or follow our advice to attempt to remove manually the threat, restore the damage done by it and make your PC safer in the future.

Removing Ninja Ransomware

Even though it may seem like a more sophisticated attack, the Ninja Ransomware is a Trojan horse, after all. And trojan horses can be removed with and advanced anti-malware program in Offline Safe Mode in Windows where their files are isolated and open to detection. To remove them this way, you should try to follow the instructions below:

Step 1: Start Your PC in Safe Mode to Remove Ninja Ransomware.

Removing Ninja Ransomware from Windows XP, Vista, 7 systems:

1. Remove all CDs and DVDs, and then Restart your PC from the “Start” menu.
2. Select one of the two options provided below:

For PCs with a single operating system: Press “F8” repeatedly after the first boot screen shows up during the restart of your computer. In case the Windows logo appears on the screen, you have to repeat the same task again.


For PCs with multiple operating systems: Тhe arrow keys will help you select the operating system you prefer to start in Safe Mode. Press “F8” just as described for a single operating system.


3. As the “Advanced Boot Options” screen appears, select the Safe Mode option you want using the arrow keys. As you make your selection, press “Enter“.

4. Log on to your computer using your administrator account

While your computer is in Safe Mode, the words “Safe Mode” will appear in all four corners of your screen.

Removing Ninja Ransomware from Windows 8, 8.1 and 10 systems:

Substep 1:

Open the Start Menu
Windows-10-0 (1)

Substep 2:

Whilst holding down Shift button, click on Power and then click on Restart.

Substep 3:

After reboot, the aftermentioned menu will appear. From there you should choose Troubleshoot.

Substep 4:

You will see the Troubleshoot menu. From this menu you can choose Advanced Options.
Windows-10-2 (1)

Substep 5:

After the Advanced Options menu appears, click on Startup Settings.
Windows-10-3 (1)

Substep 6:

Click on Restart.
Windows-10-5 (1)

Substep 7:

A menu will appear upon reboot. You should choose Safe Mode by pressing its corresponding number and the machine will restart and boot into Safe Mode so you can scan for and remove Ninja Ransomware.

Step 2: Remove Ninja Ransomware automatically by downloading an advanced anti-malware program.

To clean your computer you should download an updated anti-malware program on a safe PC and then install it on the affected computer in offline mode. After that you should boot into safe mode and scan your computer to remove all Ninja Ransomware associated objects.

Spy Hunter scanner will only detect the threat. If you want the threat to be automatically removed, you need to purchase the full version of the anti-malware tool.Find Out More About SpyHunter Anti-Malware Tool / How to Uninstall SpyHunter

Decrypt Your Files Damaged by Ransomware

When it comes to decrypting your files there are several different ways to do it. You can to it, using a program called cado-nfs in Linux by clicking here.

You can also research and use the decryption tools from this page:

  • RectorDecryptor
  • RakhniDecryptor
  • RannohDecryptor
  • ScatterDecryptor
  • XoristDecryptor
  • CleanAutoRun
  • RadminerFlashRestorer – For removable media.
  • Kaspersky Rescue Disk + WindowsUnlocker

Also, a security specialist has compiled a rescue kit for most ransomware viruses. Make sure you check to download it by clicking on this page. Cisco has also come up with ransomware decryption tool against strong algorithms. You can check it out by clicking here

Even though some of the decryption programs may not fit your particular ransomware variant, it is advisable to try every one of them because they use different methods to decrypt files and may provide you with various results. The best way to do it is to run the file decryption in all of the programs simultaneously on one or more machines and set the system’s Power Settings never automatically to hibernate or go into sleep mode. Decryption may take time and you need to make sure that you are not interrupted.

Protecting Yourself from Ransomware In the Future

Security engineers recommend that you back up your files immediately, preferably on an external memory carrier in order to be able to restore them. In order to protect yourself from Ninja Ransomware (For Windows Users) please follow these simple steps:

For Windows 7 and earlier:

1-Click on Windows Start Menu
2-Type Backup And Restore
3-Open it and click on Set Up Backup
4-A window will appear asking you where to set up backup. You should have a flash drive or an external hard drive. Mark it by clicking on it with your mouse then click on Next.
5-On the next window, the system will ask you what do you want to backup. Choose the ‘Let Me Choose’ option and then click on Next.
6-Click on ‘Save settings and run backup’ on the next window in order to protect your files from possible attacks by Ninja Ransomware.

For Windows 8, 8.1 and 10:

1-Press Windows button + R
2-In the window type ‘filehistory’ and press Enter
3-A File History window will appear. Click on ‘Configure file history settings’
4-The configuration menu for File History will appear. Click on ‘Turn On’. After its on, click on Select Drive in order to select the backup drive. It is recommended to choose an external HDD, SSD or a USB stick whose memory capacity is corresponding to the size of the files you want to backup.
5-Select the drive then click on ‘Ok’ in order to set up file backup and protect yourself from Ninja Ransomware.
Enabling Windows Defense Feature:
1- Press Windows button + R keys.
2- A run windows should appear. In it type ‘sysdm.cpl’ and then click on Run.
3- A System Properties windows should appear. In it choose System Protection.
5- Click on Turn on system protection and select the size on the hard disk you want to utilize for system protection.
6- Click on Ok and you should see an indication in Protection settings that the protection from Ninja Ransomware is on.
Restoring a file via Windows Defense feature:
1-Right-click on the encrypted file, then choose Properties.
2-Click on the Previous Versions tab and then mark the last version of the file.
3-Click on Apply and Ok and the file encrypted by Ninja Ransomware should be restored.

Certain settings need to be modified in Windows that will also change your behavior and will make you use your machine more safely:

  • Make sure to use additional firewall protection. Downloading a second firewall (like ZoneAlarm, for example) is an excellent solution for any potential intrusions.
  • Make sure that your programs have less administrative power over what they read and write on your computer. Make them prompt you admin access before starting.
  • Use stronger passwords. Stronger passwords (preferably ones that are not words) are harder to crack by several methods, including brute forcing since it includes pass lists with relevant words.
  • Turn off AutoPlay. This protects your computer from malicious executable files on USB sticks or other external memory carriers that are immediately inserted into it.
  • Disable File Sharing – it is recommended if you need file sharing between your computer to password protect it to restrict the threat only to yourself if infected.
  • Switch off any remote services – this can be devastating for business networks since it can cause a lot of damage on a massive scale.
  • If you see a service or a process that is external and not Windows critical and is being exploited by hackers (Like Flash Player) disable it until there is an update that fixes the exploit.
  • Make sure always to update the critical security patches for your software and OS.
  • Configure your mail server to block out and delete suspicious file attachment containing emails.
  • If you have a compromised computer in your network, make sure to isolate immediately it by powering it off and disconnecting it by hand from the network.
  • Make sure to educate all of the users on the network never to open suspicious file attachments, show them examples.
  • Employ a virus-scanning extension in your browser that will scan all the downloaded files on your computer.
  • Turn off any non-needed wireless services, like Infrared ports or Bluetooth – hackers love to use them to exploit devices. In case you use Bluetooth, make sure that you monitor all of the unauthorized devices that prompt you to pair with them and decline and investigate any suspicious ones.
  • Employ a virus-scanning extension in your browser that will scan all the downloaded files on your computer.
  • Employ a powerful anti-malware solution to protect yourself from any future threats automatically.

Berta Bilbao

Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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