How to remove CXK NMSL ransomware from the operating system?

Also Known As: CXK NMSL virus
Distribution: Moderate
Damage level: Severe

CXK NMSL ransomware removal instructions

What is CXK NMSL?

CXK NMSL is the name given to a malicious program, which is classified as ransomware. Credit for its discovery belongs to Germán Fernández. One of the distribution methods of this malware is via Corona virus themed email spam campaigns. Additionally, the malicious executable of CXK NMSL (which initiates the infection) - can be similarly disguised, e.g. as important information concerning the aforementioned virus. CXK NMSL ransomware is designed to encrypt the data of infected systems and demand a ransom to be paid for the decryption. During the encryption process, all affected files are appended with the ".cxk_nmsl" extension. For example, a file originally titled something like "1.jpg" would appear as "1.jpg.cxk_nmsl" - following encryption. After this process is finished, a ransom note - "CXK-NMSL-README.txt" in Chinese, is created. Furthermore, CXK NMSL displays various error messages, opens the browser and redirects to a video on bilibili video sharing website, it also opens a media player and auto-plays a song.

According to a rough translation, the ransom note informs victims that their data has been encrypted. It also clarifies that the files have been encrypted and not corrupted. The only method of recovering the data is to purchase the decryption tools/software from the cyber criminals behind CXK NMSL ransomware. The ransom is 100 B coins (the currency used on the bilibili site). The message contains links to pages detailing what B coins are and from where to purchase them. After the payment is transferred to the criminals' bilibili account, victims are to contact them in order to confirm the transaction. Additionally, the criminals ask for 10 screenshots of Cai Xukun (Chinese celebrity) ghost animal video (i.e. the video that is force-opened on the browser; possibly, other similar videos as well) for three consecutive times. The users are informed that the cyber criminals may not respond immediately, however they promise to do when they will be available. The note ends with warnings, alerting users not to modify the added extension (i.e. ".cxk_nmsl") and/or otherwise tamper with the encrypted files - as that may damage them beyond repair. In many cases of ransomware infections, without the involvement of the individuals responsible - decryption is impossible. It might be, if the malware is still in development and/or has bugs/flaws. Whatever the case, it is expressly advised against meeting the ransom demands. Often, despite paying - users do not receive the promised decryption tools/software. Therefore, not only does their data remain encrypted and worthless, but they experience financial losses as well. To prevent further encryptions - the CXK NMSL malicious program must be removed from the operating system. Unfortunately, removal will not restore already compromised files. The only possible solution is recovering them form a a backup, if one was made before the infection and was stored in a separate location.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

CXK NMSL decrypt instructions (CXK-NMSL-README.txt)

PrometeySDfghjklBadutClowns TeamOnix are a couple of examples of other ransomware. Malicious software classified as such - is designed to encrypt data and demand payment for the decryption. There are several significant differenced in-between: the cryptographic algorithm used (symmetric or asymmetric) and the ransom size. To protect data from data encrypting and/or damaging infections, it is recommended to keep backups in remote servers and/or unplugged storage devices. Ideally, several backup copies should be stored in multiple different locations.

How did ransomware infect my computer?

The CXK NMSL ransomware has been observed spreading through Corona virus themed email spam campaigns. These deceptive emails infect systems via infectious files attached to (or linked inside) them. Virulent files can be in various formats (e.g. Microsoft Office and PDF documents, archive and executable files, JavaScript, etc.) and when they are opened - it initiates the infection process. The researched sample of CXK NMSL was distributed in an archived file that contained the malicious executable. The latter is disguised as a Microsoft Office Excel file titled - "2020.1.10-2020.1.23Information on Travelers from Wuhan China to India.xlsx .exe". However, other disguises/filenames and distribution methods are likely. In general, aside from spam campaigns, ransomware and other malware proliferates through trojans, illegal activation tools ("cracks"), fake updaters and untrustworthy download channels. Trojans are malicious programs, capable of causing chain infections (i.e. download/installation of additional malware). Rather than activate licensed product, illegal activation tools can download/install malicious software. Illegitimate updaters infect systems by exploiting flaws of outdated programs and/or by simply installing malware instead of the promised updates. Untrustworthy download sources, like: unofficial and free file-hosting websites, Pee-to-Peer sharing networks (BitTorrent, eMule, Gnutella, etc.) and other third party downloaders - can offer malicious content, by presenting malware as ordinary software and/or packed alongside such.

Threat Summary:
Name CXK NMSL virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .cxk_nmsl
Ransom Demanding Message CXK-NMSL-README.txt
Ransom Amount 100 B Coins (bilibili)
Cyber Criminal Contact Via cyber criminals' bilibili account
Detection Names Avast (Win32:Evo-gen [Susp]), BitDefender (Gen:Heur.Zilix.1), ESET-NOD32 (Win32/Packed.ASProtect.AAB), Kaspersky (Packed.Win32.Black.d), Full List Of Detections (VirusTotal)
Rogue Process Name Adobe ® Flash ® Player Utility
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Additional Information The malware displays various error messages, force-open a video on the bilibili website and plays a song on a media player.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.

To eliminate CXK NMSL virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

It is recommended not to open suspicious and/or irrelevant emails, especially ones received from unknown/suspect senders (addresses). Any attachments (or links) found in dubious mail - must never be opened, as these files are a potential source of an infection. Only official and verified download channels should be used. Programs should be activated and updated with tools/functions provided by legitimate developers. To ensure device integrity, it is crucial to have a dependable anti-virus/anti-spyware suite installed and kept up-to-date. This software is to be used for regular system scans and removal of detected threats/issues. If your computer is already infected with CXK NMSL, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in CXK NMSL ransomware's text file ("CXK-NMSL-README.txt"):

Original text:


---=    CXK NMSL! V3.3    =---
hxxps:// #B%E5%B8%81%E7%9B%B8%E5%85% B3?id=669064f15cb84ca5a9ff48081bf00c99
hxxps:// #%E7%A1%AC%E5%B8%81%E7%9B% B8%E5%85%B3?id=0a9b4e2ca5e942b4a565a83390399d0c
| 0. 注册一个帐号 - hxxps://
| 1. 购买B币
| 2. 支付100B币到hxxps://
      hxxps:// #%E5%85%85%E7%94%B5%E8%AE% A1%E5%88%92?id=14cf474095a44dae9a497fba17fa55d7
      然后点击 注意:电池=硬币
| 3. 支付完成后点击进行联系,确认付款成功,并将给10个蔡徐坤鬼畜视频三连的截图发给我。                        
| 4. 由于我不是时刻在线,所以付款完成和发完消息之后请等待回复。
---=    END    =---


Rough English translation:


--- = CXK NMSL! V3.3 = ---
The files on your computer are encrypted! ------
Documents, pictures, videos, audio, compressed files on your computer ... almost all types of files are extorted by cxk-nmsl!
The software is encrypted and cannot be opened normally. This is fundamentally different from a corrupted file. You can find it online
Find a way to recover files, I can guarantee that without me to help you decrypt, even if Cai Xukun is here, I ca n’t recover your text
How do I decrypt these files? ------
Only I can help you decrypt your files, but there is a fee. You need to buy my decryptor and use it to scan
Trace and decrypt files on your computer.
Price and payment method. ------
I will only accept B coins. If you do not understand what B coins are or do not know how to buy B coins, please go to
hxxps:// #B%E5%B8%81%E7%9B%B8% E5%85%B3?id=669064f15cb84ca5a9ff48081bf00c99
You need to pay 100B coins, and give three consecutive 10 Cai Xukun ghost animal videos on bilibili to decrypt your files.
By the way, Sanlian likes, coins and collects. Putting coins is rewarding coins, which is two concepts with B coin.
If you do n’t understand what a coin is or how to get it, go to
hxxps:// #%E7%A1%AC%E5%B8%81%E7%9B%B8% E5%85%B3?id=0a9b4e2ca5e942b4a565a83390399d0c
Payment methods
| 0. Sign up for an account-hxxps://
| 1. Buy B Coins
| 2. Pay 100B coins to hxxps://
      Note, please pay by "charging", if you do n’t know how to do it, go to
      hxxps:// #%E5%85%85%E7%94%B5%E8%AE%A1% E5%88%92?id=14cf474095a44dae9a497fba17fa55d7
      Then click Note: battery = coin
3. After the payment is completed, click to contact, confirm the payment is successful, and send me screenshots of 10 Cai Xukun ghost animal videos for three consecutive times.
| 4. Since I am not always online, please wait for a reply after the payment is completed and the message is sent.
note! ------
Do not modify the file extension and file content, as this may damage the file.
So please do not try.
--- = END = ---

Screenshot of the video on bilibili opened by CXK NMSL ransomware:

bilibili website opened by CXK NMSL ransomware

Screenshot of the media player, playing the song, opened by CXK NMSL ransomware:

CXK NMSL ransomware media player

Screenshot of CXK NMSL ransomware's process on the Windows Task Manager ("Adobe ® Flash ® Player Utility"):

CXK NMSL ransomware process on task manager (Adobe ® Flash ® Player Utilit process)

Screenshot of files encrypted by CXK NMSL ransomware (".cxk_nmsl" extension):

Files encrypted by CXK NMSL ransomware (.cxk_nmsl extension)

CXK NMSL ransomware removal:

Instant automatic removal of CXK NMSL virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of CXK NMSL virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the CXK NMSL virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the CXK NMSL ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining CXK NMSL ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of CXK NMSL are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by CXK NMSL, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as CXK NMSL ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites, and Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove CXK NMSL ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
CXK NMSL virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of CXK NMSL virus on your mobile device.
We Recommend:

Get rid of CXK NMSL virus today:

▼ REMOVE IT NOW with Spyhunter

Platform: Windows

Editors' Rating for Spyhunter:
Editors ratingOutstanding!

[Back to Top]

Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.