Home > Ransomware > Remove MW_ IN FILES.txt or KK_ IN YOUR DOCUMENTS.txt, Trojan-Ransom.NSIS.ONION.air

Remove MW_ IN FILES.txt or KK_ IN YOUR DOCUMENTS.txt, Trojan-Ransom.NSIS.ONION.air

Name Trojan-Ransom.NSIS.ONION.air
Type Trojan, Ransomware
Short Description A file-encrypting threat, that encrypts the user’s files and ask for payment to decrypt them via unique key.
Symptoms Files are encrypted and a ransom message is displayed.
Distribution Method Via Exploit Kits, network vulnerabilities, spam emails, etc.
Detection tool Download SpyHunter, to See If Your System Has Been Affected By Trojan-Ransom.NSIS.ONION.air
Data Recovery Tool Windows 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.

Ransomware doesn’t sleep and we have a new file encrypting threat on the malware horizon to prove it. Actually, the Trojan ransomware that has just been detected is considered a new variant of the Onion Ransomware (Trojan-Ransom.Win32.Onion) also known as CTB-Locker or Citroni. Ransomware pieces are being redesigned as we speak and there are many cases of CryptoWall and CryptoLocker copycats. Sophisticated and not-so-crafted ransom malware is being sold on the black market. Why? Ransomware and online money theft have proven to be effective methods for quick and easy gain.p10_0000

The message displayed by the new version of the Onion Ransomware (a.k.a. Trojan-Ransom.NSIS.ONION.air) is:


The ransom message within .txt file contains the following information:

→Good day. Your computer has been locked by ransomware, your personal files are encrypted and you have unfortunately “lost” all your pictures,
files and documents on the computer. Your important files encryption produced on this computer: videos, photos, documents, etc.
Encryption was produced using unique public key RSA-1024 generated for this computer. To decrypt files you need to obtain the private key.
All encrypted files contain MW_
Your number: [edited] To obtain the program for this computer, which will decrypt all files, you need to pay
3 bitcoins on our bitcoin address [edited] (today 1 bitcoin was 260 USA dollars). Only we and you know about this bitcoin address.
You can check bitcoin balanse here – https://www.blockchain.info/address/[edited] After payment send us your number on our mail ttk@ruggedinbox.com and we will send you decryption tool (you need only run it and all files will be decrypted during 1…3 hours)
Before payment you can send us one small file (100..500 kilobytes) and we will decrypt it – it’s your garantee that we have decryption tool. And send us your number with attached file
We dont know who are you. All what we need – it’s some money.
Don’t panic if we don’t answer you during 24 hours. It means that we didn’t received your letter (for example if you use hotmail.com or outlook.com
it can block letter, SO DON’T USE HOTMAIL.COM AND OUTLOOK.COM. You need register your mail account in www.ruggedinbox.com (it will takes 1..2 minutes) and write us again)
You can use one of that bitcoin exchangers for transfering bitcoin.

Trojan-Ransom.NSIS.ONION.air Technical Resume

As already mentioned, the MW_ IN FILES.txt or KK_ IN YOUR DOCUMENTS.txt message is distributed via a new variant of the Onion Ransomware – Trojan-Ransom.NSIS.ONION.air. The malicious piece is encrypting files via the RSA-1024 encryption key. Once the encryption process has finished, the cyber criminals will ask for a payment of 3 bitcoins to decrypt the files with the unique decryption key. As of the time the ransom message was created, 1 bitcoin was about $260.

Interestingly enough, according to users’ posts on BleepingComputer, a decryption key was provided after 1 bitcoin was paid. It won’t be the first time crooks deliver the deciphering tool without the whole ransom amount being transferred.

Onion Ransomware Technical Details

Onion Ransomware is also dubbed CTB-Locker and Citroni. Since CTB-Locker has been quite active in 2015, a lot of information has been gathered about its ways. For instance, it is known that Critoni Ransomware has the same features as other ransom Trojans. CTB-Locker makes randomly selected files unreadable. In most cases, a .TXT file contains the instructions for the Bitcoin-based payment required for the decryption of the user’s files. Such malware often exploits network vulnerabilities and can be spread with the help of Exploit Kits. Spam-email messages are one of the common ways to infect a system.

The latest version of the Onion ransom is most likely not that different, compared to its malicious predecessors. However, Trojans are famous for acting as backdoors on affected system which means that more malicious software can enter any time. A scan report indicates that Trojan-Ransom.NSIS.ONION.air may be accompanied by other Trojans and exploiting tools:

  • Not-a-virus:NetTool.Win32.Wasppace.I
  • Trojan.Win32.Fsysna/.ccym
  • Backdoor.Win32.Hlux.dca
  • HEUR:Trojan.Win32.Generic


Image Source: BleepingComputer

Keep in mind that the ‘infection’ described above may be true for one particular system only.

Trojan-Ransom.NSIS.ONION.air Removal Instructions

Trojan-Ransom.NSIS.ONION.air may be residing in any of the following directories:

  • %Temp%
  • C:\\.exe
  • %AppData%
  • %LocalAppData%
  • %ProgramData%
  • %WinDir%

The listed locations are often used by malicious executables related to aggressive rasomware attacks.

An anti-malware solution will detect and delete the threat. However, file decryption can happen only when the decryption key is obtained. On the grounds of Kaspersky Lab vast research on the Onion family , files can be decrypted only with the master-private key.

What is even worse is that there have been cases when not only the files located on the system were encrypted but the backup copies as well.

Additionaly, what we can suggest to you, our readers, is educate yourselves about how ransomware works. To do that, feel free to refer to the following articles:

Restore Files Encrypted by Ransomware Manually

CryptoLocker’s Copycats

CryptoWall .aaa Files

To remove Trojan-Ransom.NSIS.ONION.air, scan the system. To preserve your files, you may want to use an external storage device, since newly-crafted ransomware may be capable of affecting back-up copies as well.

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

Milena Dimitrova

An inspired writer and content manager who has been with SensorsTechForum since the project started. A professional with 10+ years of experience in creating engaging content. Focused on user privacy and malware development, she strongly believes in a world where cybersecurity plays a central role. If common sense makes no sense, she will be there to take notes. Those notes may later turn into articles! Follow Milena @Milenyim

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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy

Windows Mac OS X

How to Remove Trojan-Ransom.NSIS.ONION.air from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove Trojan-Ransom.NSIS.ONION.air


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 Trojan-Ransom.NSIS.ONION.air 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 Trojan-Ransom.NSIS.ONION.air 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 Trojan-Ransom.NSIS.ONION.air 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 Trojan-Ransom.NSIS.ONION.air 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 Trojan-Ransom.NSIS.ONION.air.

Ransomware infections and Trojan-Ransom.NSIS.ONION.air 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:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Windows Mac OS X

Get rid of Trojan-Ransom.NSIS.ONION.air from Mac OS X.

Step 1: Uninstall Trojan-Ransom.NSIS.ONION.air 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 Trojan-Ransom.NSIS.ONION.air:

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 Trojan-Ransom.NSIS.ONION.air. 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 Trojan-Ransom.NSIS.ONION.air. 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 Trojan-Ransom.NSIS.ONION.air 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 Trojan-Ransom.NSIS.ONION.air. 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.

Click the button below below to download SpyHunter for Mac and scan for Trojan-Ransom.NSIS.ONION.air:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by Trojan-Ransom.NSIS.ONION.air.

Ransomware infections and Trojan-Ransom.NSIS.ONION.air 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:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Trojan-Ransom.NSIS.ONION.air FAQ

What is Trojan-Ransom.NSIS.ONION.air ransomware and how does it work?

Trojan-Ransom.NSIS.ONION.air is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does Trojan-Ransom.NSIS.ONION.air ransomware infect my computer?

Via several ways.Trojan-Ransom.NSIS.ONION.air Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of Trojan-Ransom.NSIS.ONION.air is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .Trojan-Ransom.NSIS.ONION.air files?

You can't. At this point the .Trojan-Ransom.NSIS.ONION.air files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .Trojan-Ransom.NSIS.ONION.air files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by Trojan-Ransom.NSIS.ONION.air ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".Trojan-Ransom.NSIS.ONION.air" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Trojan-Ransom.NSIS.ONION.air files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of Trojan-Ransom.NSIS.ONION.air ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Trojan-Ransom.NSIS.ONION.air ransomware and then remove it without causing any additional harm to your important .Trojan-Ransom.NSIS.ONION.air files.

Also, keep in mind that viruses like Trojan-Ransom.NSIS.ONION.air ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

How to Report Ransomware to Authorities?

In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer. Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:

Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:

Reports may be responded to in different timeframes, depending on your local authorities.

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