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NM4 ransomware virus. How to remove? (Uninstall guide)

removal by Julie Splinters - - | Type: Ransomware

NM4 – ransomware virus that received updates at the end of April, 2018

NM4 virus example

Questions about NM4 ransomware virus

NM4 is a crypto-ransomware virus that uses a combination of RSA-2048 and AES-256 cryptography to lock files on targeted PCs. It's a variation of R ransomware[1], which has been spreading around since 2017.  Like its predecessor, it interacts with victims via TOR onion website link – Recovers your files.html. NM4 ransomware renames the locked files by adding a .nm4 file extension, though the newer version know as .NMCRYPT! file extension virus has been spotted in the middle of April. It creates a ransom note and demands the victim to pay 1 BTC ransom, which is currently equal to 9,292 USD. 

Name NM4
Type of malware Ransomware
Symptoms Files inaccessible due to .nm4 or .NMCRYPT! file extension. Recovers your files.html file on the desktop. Random system's restarts
Dangers File and money loss
Ransom demanded 1 BTC (approx. 9,000 USD)
Distribution Malspam, Exploit kits, brute-force attacks, rogue software, etc.
The only way that grants ransomware removal is a full system scan with anti-virus. Our recommendation – Reimage

Last year, the ransom was raised to 3 BTC, though the price of the Bitcoin was considerably smaller. In order to earn users’ trust, the perpetrators offer decrypting 3 selected files for free. However, in the same note, they emphasize that they hardly care about users' files. Instead of nurturing hopes about the data retrieval, proceed to NM4 removal. Reimage or Plumbytes Anti-MalwareNorton Internet Security assists in the elimination procedure.

NM4 ransomware virus

One of the most obvious distinctive specifications of the hackers is their tendency to name ransomware. In the previous case, the hackers did not bother themselves with making up an elaborate one. This time, they even exceeded themselves with extending the title up to three letters. NM4 ransomware uses the same GUI[2] as in the case of R virus.

The developer of this malware does not seem to be native English speaker. The web page even contains additional links instructing users how to purchase bitcoins. Summing up the features, the hackers manifest sufficient knowledge of programming as they have assured that their anonymity is guaranteed. The fact that the current malware is an improved version of the previously mentioned ransomware suggests that the hackers may continue releasing new threats.

Information about its distributing trojans[3] would contribute to the analysis and termination of the malware. During the presence of this malware, you might notice slower PC processes. In addition, check the Task Manager for any suspicious tasks. By canceling them, you might interfere with the malware operation procedure.

In some cases restarting the computer interrupts data encryption process. Needless to say that it is quite difficult to spot the first signs of the malware as it covertly hides them. Nonetheless, there is no need to pay the ransom but instead, remove NM4 removal.

Peculiarities of the malware distribution

The ransomware may settle on the system via two main transmission peculiarities. It may be transmitted via corrupted spam email attachments[4]. In that case, it is necessary to evaluate to assess the situation properly when you receive a spam email addressed directly to you. If such email carries ransomware, you may notice that the message contains grammar mistakes and altered credentials. Furthermore, you should increase the overall security of the system by arming up with protective means. It would be useful to combine anti-virus and anti-spyware programs. A firewall would be practical as well. The former programs also benefit in eliminating malware[5].

NM4 removal steps

This malware is capable of inflicting damage, so it is important to remove NM4 virus as soon as possible. For that purpose, you might make use of malware termination utilities. Taking into account that the malware is well-designed, you may notice that it prevents you from launching antivirus or anti-spyware tools. In that case, you will find the below guide useful. On the final note, keep in mind that even if you remit the payment, that the developers might not play fair and decrypt all your encrypted files.

NM4 ransomware demands for 1BTC

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
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More information about this program can be found in Reimage review.

If you decided to select another anti-spyware, uninstall Reimage from your computer.
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To remove NM4 virus, follow these steps:

Remove NM4 using Safe Mode with Networking

Safe Mode will enable you access to certain functions. Otherwise, you will be able to finish NM4 elimination.

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove NM4

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete NM4 removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove NM4 using System Restore

If the former method does not help, System Restore should grant the access.

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of NM4. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that NM4 removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove NM4 from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by security experts.

If your files are encrypted by NM4, you can use several methods to restore them:

Does Data Recovery Pro recover files?

This program was designed to recover lost and damaged files after a system crash, however, it might be effective in recovering the files encrypted by NM4 ransomware as well.

  • Download Data Recovery Pro;
  • Follow the steps of Data Recovery Setup and install the program on your computer;
  • Launch it and scan your computer for files encrypted by NM4 ransomware;
  • Restore them.

Make use of Windows Previous Versions feature

If System Restore function has been enabled before, you might succeed in recovering some of the files.

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

Opting for ShadowExplorer

The key benefit of this program is shadow volume copies. It uses these copies to restore damaged and corrupted valuable files.

  • Download Shadow Explorer (;
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

About the author

Julie Splinters
Julie Splinters - Malware removal specialist

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