Nlah ransomware

Nlah ransomware is the newest file encryption virus of Djvu ransomware family that might cause the loss of important data for its users

Nlah ransomware virus

Nlah ransomware virus

Nlah ransomware, first discovered by Michael Gillespie[1], is the latest family member of the Djvu ransomware family, which is positioned 229th in the list. Just like its ancestor, it uses a unique algorithm to lock data on the attacked PC and appends the .nlah file extension to manifest the encryption. Although Emsisoft developed a fully-functional STOP/Djvu decryption software, it can decrypt files encrypted by Djvu variants launched before August 2019. 

Nlah ransomware virus payload is usually launched by unsuspecting PC users by opening infected email attachments or downloading pirated software on P2P networks. If the virus is successfully launched, it alters Windows Registry/Task Manager/Boot sequence to gain control over the system and launch the encryption algorithm smoothly. Upon that, photos, documents, and other personal property stored on the machine are locked and the specific appending is added. This ransomware is also dubbed as .nlah file extension virus based on the suffix of encrypted files. The ransom demand varies from $490 to $980, which is disclosed in _readme.txt file or lock screen. 

Name Nlah
Type Ransomware / encryption-based malware
Geneology Djvu ransomware family
List number 229th in the list
File extension .nlah file extension
Ransom note _readme.txt
Danger level High. Permanent file loss possible. Serious Windows system compromises can cause system crashes.
Symptoms Inaccessible files on the machine. Ransom file created on the desktop and non-system files. Sluggish PC’s performance, high CPU usage, unresponsive AV engine
Elimination Nlah removal depends on the powerful anti-virus program
 Damage fix Use Reimage Reimage Cleaner Intego to restore the settings that have been set before the ransomware attack 

During the installation, Nlah ransomware virus payload is extracted and multiple malicious entries are scattered through multiple system’s locations. Some of the components are responsible for compromising Windows OS performance, the others for launching the cipher for data lock, and the last part initiates modifications to gain persistence, and prevent removal. 

Typically, Nlah ransomware virus drops a malicious executable file in the %LocalAppData% or %AppData% and disguises it under legitimate Windows OS file names. Alternatively, it runs a Windows PowerShell command under administrative privileges, which deletes Volume Shadow Copies[2]

In many other traits, Nlah ransomware is identical to Zipe, Koti, Mzlq, Nesa, Gero, and the rest of 228 variants. However, not all of the Djvu versions are equally active. The activity of the ransomware depends mostly on its distribution technique and it seems that this latest version is likely to be persistent. Just a few hours after its release, people started reporting on Reddit[3] that their files have been encoded by this malicious crypto-ransomware. 

According to the reports, the .nlah file virus is capable of locking most of the non-system files. Upon that, it automatically creates a text file _readme.txt, which informs the victim about the following requirements: 

  • He or she has to pay the ransom that varies from $490 to $980;
  • The only currency accepted – Bitcoin;
  • The contacts of the Nlah ransomware managers – [email protected] and [email protected];
  • If the victim contacts criminals less than 72 hours after the attack, they apply the lowest price for the decryption software; 
  • This version of ransomware uses an online key protected by RSA encryption cipher. Therefore, the decrypted files cannot be recovered for free.

The original file of the ransom demand text file contains the following information:


Don’t worry, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that’s price for you is $490.
Please note that you’ll never restore your data without payment.
Check your e-mail “Spam” or “Junk” folder if you don’t get answer more than 6 hours.

To get this software you need write on our e-mail:
[email protected]

Reserve e-mail address to contact us:
[email protected]

Your personal ID:

If you have fallen victim to this cyber infection, please do not fall for paying the ransom. Experts from[4] claim that paying the ransom is a big mistake because of future insecurities that emerge because the victim may disclose some pieces of personal information to criminals during the transfer of the payment. Besides, giving away money to criminals can’t fix your machine. Therefore, full Nlah ransomware removal is a better solution. 

Nlah ransom note
Nlah file-encrypting virus is infamous for restricting people’s access to personal files and extorting money from them

Nlah ransom note
Nlah file-encrypting virus is infamous for restricting people’s access to personal files and extorting money from them

In terms of decryption of the personal files locked by this ransomware, it’s advisable to get an HDD or a high capacity USB flash drive for cold storage backups. Copy all encrypted data on the alternative storage and then run a thorough system scan with SpyHunter 5Combo Cleaner security tool to remove Nlah ransomware completely. 

If you cannot remove Nlah virus because it actively blocks your anti-virus software, the only way to decontaminate malicious processes is to restart Windows OS into Safe Mode. The guide on how to do that is provided at the end of this post. Nevertheless, don’t try to look for malicious entries manually because you will only waste your time for nothing.

The vulnerable system is a perfect target for criminals

The amount and time you invest in the system’s stability and security pay off not in the cache, but the possibility to use the system efficiently and safely. Those who do not invest in professional AV software package, use illicit Windows version, fails to update software, and leave vulnerabilities unpatched risk exposing PCs to hacks and virus attacks. 

Security experts claim that people should patch vulnerabilities by installing the latest software updates. Microsoft regularly releases patches to fix security vulnerabilities, especially the ones that are easily exploitable by hackers. 

If you are using RDP services, make sure to password protect the service and use a strong password, not 123321 because it can easily be revealed. Besides, do not underestimate the protection capabilities of the professional AV programs. A full pack of security tools can help to protect the system in real-time attacks, as well as quarantine cyber threats that have already installed on the machine. 

Apart from brute force attacks and exploits, criminals prefer spamming campaigns for spreading ransomware payloads. Criminals create professional-looking emails pretending to be from courier companies (Fedex, DHL, etc.), banking firms, governmental institutions, or various worldwide-known organizations. Such emails contain an attachment, which carries obfuscated ransomware payload.  

Therefore, we strongly encourage people to not open email messages that contain grammar, spelling mistakes, or unknown sender. Such attachment supplemented emails are a perfect medium for spreading not only ransomware but other malware as well, so it’s better to send them to spam immediately than opening just to satisfy curiosity. 

Only a robust anti-virus tool can fully remove Nlah virus ransomware

Nlah ransomware removal is not the procedure that can be initiated in an easy way. People who are not tech-savvy enough can hardly any malicious entries by themselves as they are usually disguised under legitimate Windows system files in the following locations: 

  • %AppData%
  • %Local%
  • %LocalLow%
  • %Roaming%
  • %Temp%

To remove Nlah virus once and for all, try downloading these tops: SpyHunter 5Combo Cleaner or Malwarebytes. This piece of software will check the system for all malicious files and processes that belong to the suite of the ransomware and you won’t have to search for any dangerous entries by yourself. 

Nlah ransomware spam
Nlah virus can attack a PC if its owner opens a malicious spam email attachment

Nlah ransomware spam
Nlah virus can attack a PC if its owner opens a malicious spam email attachment

If, however, you doubt about the removal of this ransomware because you are afraid of losing files encrypted by .nlah file extension virus, then we can assure that keeping the virus on the system will not help with file recovery. As soon as the virus is removed, we recommend making backups of encrypted files and keep them in the external storage until cybersecurity experts find the flaw in the encryption algorithm and update the existing Emsisoft’s decryption tool. 

Alternatively, you can find tips on how to recover files locked by Nlah ransomware virus at the end of this article. We strongly recommend trying each of the methods because they can help you to restore at least a part of corrupted documents. 

Besides, the post-ransomware for of the Windows OS requires deep maintenance. Compromised registry keys and executables can end up with incompatibilities, errors, BSODs, and similar malfunctions. Thus, we recommend scanning the system with Reimage Reimage Cleaner Intego to fix Nlah ransomware virus damage. 

Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.

Remove Nlah using Safe Mode with Networking

Safe Mode environment is required to delete the ransomware completely. A scan in a regular environment can end up with AV unresponsiveness and failure of the removal process.

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

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

Remove Nlah using System Restore

Bonus: Recover your data

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

Nlah ransomware locks files just like any other Djvu variant. However, the versions that were encrypted using the offline keys can be recovered using Emsisoft’s STOP/Djvu decrypter. This 229th version has no decryption software, at least for now, so you can try alternative data recovery methods listed below:

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

Employ Data Recovery Pro for file recovery

Data Recovery Pro is a tool that can be used for file decryption. However, before launching it, make sure that you have completely removed the Nlah ransomware. 

  • 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 Nlah ransomware;
  • Restore them.

Unlock files locked by .nlah extension with Windows Previous Versions feature

Unfortunately, users who did not have the Windows Previous Versions feature enabled, won’t be able to retrieve any of the locked 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”.

Run Shadow Explorer software

Djvu developers are known for programming their software to delete Volume Shadow Copies. However, try to look for flaws in ransomware programming with the help of this tutorial.

  • 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.

Nlah decryptor is in a development stage. No free key is currently available.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Nlah and other ransomwares, use a reputable anti-spyware, such as Reimage Reimage Cleaner Intego, SpyHunter 5Combo Cleaner or Malwarebytes

This entry was posted on 2020-06-03 at 02:02 and is filed under Ransomware, Viruses.