Home > Ransomware > .cxk Virus File (BlackMoon Ransomware) – Removal Guide

.cxk Virus File (BlackMoon Ransomware) – Removal Guide

.cxk file extension is placed on all of your files? .cxk Virus File is also known as BlackMoon ransomware which locks files on a computer and demands money to be paid as a ransom for unlocking them.


BlackMoon Ransomware (.cxk Virus File)

BlackMoon or otherwise known as .cxk Virus File is a ransomware type virus. It encrypts files by appending the .cxk extension to them, making them inaccessible. All encrypted files will receive the new extension as a secondary one. The BlackMoon ransomware drops a ransom note, which gives instructions to victims on how they can allegedly restore their data by paying a ransom fee.

BlackMoon Ransomware Virus

BlackMoon Ransomware will encrypt all types of files such as audio, video, pictures, backups, banking data and other personal user files found on a compromised computer system.

Threat Summary

Name cxk Virus (BlackMoon)
File Extension .cxk
Type Ransomware, Cryptovirus
Short Description The ransomware encrypts files on your computer system and demands a ransom to be paid to allegedly recover them.
Symptoms The BlackMoon ransomware will encrypt your files by appending the .cxk extension to them, along with a unique identification number placing the new .cxk extension as a secondary.
Distribution Method Spam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by malware


Malware Removal Tool

User Experience Join Our Forum to Discuss cxk Virus (BlackMoon).

.cxk Virus File – How Did It Infect My PC and What Happened?

.cxk Virus File might spread its infection via a payload dropper, which initiates the malicious script for this ransomware. The virus might also distribute its payload file on social media and file-sharing services. Freeware which is found on the Web can be presented as helpful also be hiding the malicious script for the cryptovirus.

You can read the article about the BlackMoon Banking Trojan if you are interested to find the differences in these two threats that have the same name.

The ransomware encrypts your files and shows ransomware instructions inside a ransom note that is inside a .txt file as showcased in the picture below:


The note states the following:



眼.图片、 文档. 泡包. 音名. 祝尔维 eXe纵等, 苑有关之妾尽加审基, 是以不能常开。

此与凡有瑞文折上之异。 公大可在网上求兰之法, 臣节保证, 无我之解密也, 即天之不外此文档。

固有可页之法。只因我之解密向才 页。吾以身保, 安能供事者页效。

但是收费之, 亦不可无限期之过。

诗点半< DeCrypt按多>, 由可无堂簿之文档。诸君放心, 我是不会注也。

而欲友悉文档, 台给点费e5a48de588b6e79fa5e9819331333363373163。
是否随=j都可定金称给, 隐 和之卑, 国非, 过久不利于君给。

至三日内给芝, 过三日岂信费。

又有, 一礼天内不绽, 将永不复。

言于也, 忘了告, 于半年以上无扒给者, 必有款无学复, 鸡否及子, 由说君之泛何80? 。


我只会受比特握。 不知比特后何, 诗点吉恰详< About bitcoin >。

不能买比特握,计点评辣市法, < How to buy bitcoins >。


给后, 请点斌< Check Payment >按色 以比竺所之人志 所需之对有点长, 给后诸侍。
其正半为周至五, 从上午九至十点

至位尝后, 可即始复事。


若待我也炳考, 诗点斌< Contact Us >, 给我信!。

各抗议,以免绽之坷复工岩前,请匆针或池其软件, 且停关毒软件。 无沦由何也, 万一 该软件被沁疾, 甚可致给后亦不旬信也。

A machine translation with an interpretation with the mess left by a few broken symbols, results in this text in English to serve as a core variant of what the criminals have written in the above-displayed document:

What happened to all files?

Jun Zhizhong’s literary secrets are my encryption.

Photos, videos, documents, backups, will have their file names such as exe, etc., encrypted letters added, so they cannot be opened normally.
This is different from that of all Yu Ji-wen’s essays. Gongda can seek Xia Cai’s law on the Internet. It is conservative and non-self-confidential.
Is there any way to read this document and unlock my files?
The inherently feasible method is only seen because of my decryption.

However, it cannot be paid for and received indefinitely,
Speaking of clicking the , the staff may not have the documents of King Hui. Lord, rest assured, I will not pay attention to what files are kept.

People can pay to this address e5a48de588b6e79fa5e9819331333363373163
Whether or not you can deposit with Bitcoin, we want to be hidden, national currency is non-permitted and inferior, too long and not to be conducted.

Give it to us within three days.

Also, if there is no response within a day, there never will be.

Let me not forgot to tell you, that if you do not have a hacker for more than half a year, you will have no money for education, you want chicken or a child, what do you say?


I will only get Bit. I don’t’ know what happened after the bit, read more .

Can’t buy bitcoin, check market articles on .

Be the Lord: Give Jin Qin no less than the gold shown on the window

After paying, please click the button and press it to compare with Zhu Zuo’s personal records of payment history.

You have this week to Friday, from 9 to 10 am

After you have paid it, you can start to go back to business.


If you want to test me Shi Dianbin , write to me!

Protest, so as to avoid losing the files, please quickly check their software, and stop the poison software. There is no reason why, in case the software is broken down, it can even be sent to you afterwards.

You should NOT under any circumstances pay any ransom sum.

The extortionists want you to pay a ransom for the alleged restoration of your files, same as with a lot of ransomware viruses. .cxk Virus File ransomware could make entries in the Windows Registry to achieve persistence, and could launch or repress processes in a Windows system. All encrypted will receive the .cxk extension alongside a random generated one. That extension will be placed as a secondary one to each file and look something like .cxk. Audio, video, image files as well as documents, backups and banking data can be encrypted by the ransomware.

The .cxk Virus File could be set to erase all the Shadow Volume Copies from the Windows operating system with the help of the following command:

→vssadmin.exe delete shadows /all /Quiet

If your computer device was infected with this ransomware and your files are locked, read on through to find out how you could potentially restore your files back to normal.

Remove .cxk Virus File

If your computer got infected with the .cxk Virus File, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

Tsetso Mihailov

Tsetso Mihailov is a tech-geek and loves everything that is tech-related, while observing the latest news surrounding technologies. He has worked in IT before, as a system administrator and a computer repair technician. Dealing with malware since his teens, he is determined to spread word about the latest threats revolving around computer security.

More Posts

Follow Me:

  • Step 1
  • Step 2
  • Step 3
  • Step 4
  • Step 5

Step 1: Scan for cxk Virus (BlackMoon) 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.

scan for and delete ransomware virus step 2

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

scan for and delete ransomware virus step 3

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.

scan for and delete ransomware virus step 4

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

Ransomware Automatic Removal - Video Guide

Step 2: Uninstall cxk Virus (BlackMoon) and related malware 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.
delete ransomware from windows step 1

2. In the field type in "appwiz.cpl" and press ENTER.
delete ransomware from windows step 2

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"
delete ransomware from windows step 3Follow the instructions above and you will successfully delete most unwanted and malicious programs.

Step 3: Clean any registries, created by cxk Virus (BlackMoon) 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 cxk Virus (BlackMoon) there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.
delete ransomware virus registries step 1

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

3. You can remove the value of the virus by right-clicking on it and removing it.
delete ransomware virus registries step 3 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: Boot Your PC In Safe Mode to isolate and remove cxk Virus (BlackMoon)


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.
remove ransomware in safe mode step 1

2. The "Run" Window will appear. In it, type "msconfig" and click OK.
remove ransomware in safe mode step 2

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
remove ransomware in safe mode step 3
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.
remove ransomware in safe mode step 4

5. You can recognise Safe Mode by the words written on the corners of your screen.
remove ransomware in safe mode step 5

Step 5: Try to Restore Files Encrypted by cxk Virus (BlackMoon).

Method 1: Use STOP Decrypter by Emsisoft.

Not all variants of this ransomware can be decrypted for free, but we have added the decryptor used by researchers that is often updated with the variants which become eventually decrypted. You can try and decrypt your files using the instructions below, but if they do not work, then unfortunately your variant of the ransomware virus is not decryptable.

Follow the instructions below to use the Emsisoft decrypter and decrypt your files for free. You can download the Emsisoft decryption tool linked here and then follow the steps provided below:

1 Right-click on the decrypter and click on Run as Administrator as shown below:

stop ransomware decryptor step 1

2. Agree with the license terms:

stop ransomware decryptor step 2

3. Click on "Add Folder" and then add the folders where you want files decrypted as shown underneath:

stop ransomware decryptor step 3

4. Click on "Decrypt" and wait for your files to be decoded.

stop ransomware decryptor step 4

Note: Credit for the decryptor goes to Emsisoft researchers who have made the breakthrough with this virus.

Method 2: Use data recovery software

Ransomware infections and cxk Virus (BlackMoon) 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 recommended Data Recovery software by clicking on the link underneath:

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

cxk Virus (BlackMoon)-FAQ

What is cxk Virus (BlackMoon) Ransomware?

cxk Virus (BlackMoon) 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 algorithms 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.

What Does cxk Virus (BlackMoon) Ransomware Do?

Ransomware in general is a malicious software that is designed to block access to your computer or files until a ransom is paid.

Ransomware viruses can also damage your system, corrupt data and delete files, resulting in the permanent loss of important files.

How Does cxk Virus (BlackMoon) Infect?

Via several ways.cxk Virus (BlackMoon) Ransomware infects computers by being sent via phishing emails, 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.

Another way you may become a victim of cxk Virus (BlackMoon) 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 .cxk Virus (BlackMoon) files?

You can't without a decryptor. At this point, the .cxk Virus (BlackMoon) files are encrypted. You can only open them once they are decrypted using a specific decryption key for the particular algorithm.

What to Do If a Decryptor Does Not Work?

Do not panic, and backup the files. If a decryptor did not decrypt your .cxk Virus (BlackMoon) files successfully, then do not despair, because this virus is still new.

Can I Restore ".cxk Virus (BlackMoon)" Files?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .cxk Virus (BlackMoon) files. 

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

How To Get Rid of cxk Virus (BlackMoon) Virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti-malware program.

It will scan for and locate cxk Virus (BlackMoon) ransomware and then remove it without causing any additional harm to your important .cxk Virus (BlackMoon) files.

Can I 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:

Germany - Offizielles Portal der deutschen Polizei

United States - IC3 Internet Crime Complaint Centre

United Kingdom - Action Fraud Police

France - Ministère de l'Intérieur

Italy - Polizia Di Stato

Spain - Policía Nacional

Netherlands - Politie

Poland - Policja

Portugal - Polícia Judiciária

Greece - Cyber Crime Unit (Hellenic Police)

India - Mumbai Police - CyberCrime Investigation Cell

Australia - Australian High Tech Crime Center

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

Can You Stop Ransomware from Encrypting Your Files?

Yes, you can prevent ransomware. The best way to do this is to ensure your computer system is updated with the latest security patches, use a reputable anti-malware program and firewall, backup your important files frequently, and avoid clicking on malicious links or downloading unknown files.

Can cxk Virus (BlackMoon) Ransomware Steal Your Data?

Yes, in most cases ransomware will steal your information. It is a form of malware that steals data from a user's computer, encrypts it, and then demands a ransom in order to decrypt it.

In many cases, the malware authors or attackers will threaten to delete the data or publish it online unless the ransom is paid.

Can Ransomware Infect WiFi?

Yes, ransomware can infect WiFi networks, as malicious actors can use it to gain control of the network, steal confidential data, and lock out users. If a ransomware attack is successful, it could lead to a loss of service and/or data, and in some cases, financial losses.

Should I Pay Ransomware?

No, you should not pay ransomware extortionists. Paying them only encourages criminals and does not guarantee that the files or data will be restored. The better approach is to have a secure backup of important data and be vigilant about security in the first place.

What Happens If I Don't Pay Ransom?

If you don't pay the ransom, the hackers may still have access to your computer, data, or files and may continue to threaten to expose or delete them, or even use them to commit cybercrimes. In some cases, they may even continue to demand additional ransom payments.

Can a Ransomware Attack Be Detected?

Yes, ransomware can be detected. Anti-malware software and other advanced security tools can detect ransomware and alert the user when it is present on a machine.

It is important to stay up-to-date on the latest security measures and to keep security software updated to ensure ransomware can be detected and prevented.

Do Ransomware Criminals Get Caught?

Yes, ransomware criminals do get caught. Law enforcement agencies, such as the FBI, Interpol and others have been successful in tracking down and prosecuting ransomware criminals in the US and other countries. As ransomware threats continue to increase, so does the enforcement activity.

About the cxk Virus (BlackMoon) Research

The content we publish on SensorsTechForum.com, this cxk Virus (BlackMoon) how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific malware and restore your encrypted files.

How did we conduct the research on this ransomware?

Our research is based on an independent investigation. We are in contact with independent security researchers, and as such, we receive daily updates on the latest malware and ransomware definitions.

Furthermore, the research behind the cxk Virus (BlackMoon) ransomware threat is backed with VirusTotal and the NoMoreRansom project.

To better understand the ransomware threat, please refer to the following articles which provide knowledgeable details.

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.

Leave a Comment

Your email address will not be published. Required fields are marked *

This website uses cookies to improve user experience. By using our website you consent to all cookies in accordance with our Privacy Policy.
I Agree