Eliminate Nlah ransomware from the system

Also Known As: Nlah virus
Distribution: Moderate
Damage level: Medium

Nlah ransomware removal instructions

What is Nlah?

Nlah is the name of a malicious program, belonging the to Djvu ransomware family. Systems infected with this malware have their data encrypted and receive ransom demands for the decryption tools/software. During the encryption process, filenames of the affected files are appended with the ".nlah" extension. For example, a file originally titled something like "1.jpg" would appear as "1.jpg.nlah" - following encryption. After this process is complete, a ransom note - "_readme.txt"- is created.

The ransom-demanding message in "_readme.txt" states that it is possible to recover the affected files, which have been encrypted with strongest encryption and unique key. To restore them, victims are to purchase the decryption software and key from the cyber criminals behind the attack. The price of these tools is 980 USD, yet a 50% discount is available if contact with the criminals is established within 72 hours. Communication is to be held through email. Additionally, before paying, users can test decryption by sending one encrypted file. Provided, it does not contain valuable information - the file will be decrypted and sent back. Should victims fail to receive a response in 6 hours, they are instructed to inspect their "Junk/Spam" email folder. Unfortunately, in many cases of ransomware infections, decryption is impossible - without involving the individuals responsible. Recovery might be possible, if the malware is still in development and/or has significant bugs (flaws). Whatever the case, it is expressly advised against meeting the ransom demands. Since often, despite paying - victims do not receive the necessary decryption tools. Therefore, they experience financial loss and their data. To prevent further encryption, Nlah ransomware must be eliminated from the operating system. However, removal will not restore already compromised files. The sole solution is recovering them from a backup, if one was created prior to the attack and was stored in a separate location.

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

Nlah decrypt instructions (_readme.txt)

ZORABBtc (Oled)Vfcfocxp and Banks1 are a few examples of other ransomware-type programs. They are designed to encrypt data and demand payment for the decryption. There are two main differences in-between them: the cryptographic algorithms they use (symmetric or asymmetric) and size of the demanded ransom. The latter typically vary from three to four digit sums (in USD). Digital currencies (e.g. cryptocurrencies, pre-paid vouchers, etc.) are primarily used for the ransoms, due to transactions of them being difficult/impossible to trace. To protect data, it is recommended to keep backups in unplugged storage devices and/or remote servers. Ideally, backups should be stored in several different locations.

How did ransomware infect my computer?

Ransomware and other malware are commonly distributed though trojans, spam campaigns, illegal activation tools ("cracks"), illegitimate updaters and untrustworthy download channels. Trojans are a type of malware, some of which are capable of causing chain infections (i.e. download/installation of additional malicious programs). The term "spam campaign" is used to refer to a large scale operation, during which thousands of deceptive/scam emails are sent. These letters have infectious files, either attached to them or contain download links of such. Malicious files can be in various formats (e.g. PDF and Microsoft Office documents, archive and executable files, JavaScript, etc.) and when they are opened - the infection process is triggered. Rather than activate licensed product, "cracking" tools can download/install malware. Fake updaters infect systems by abusing flaws of outdated products and/or install malicious software instead of the promised updates. Malware (usually, disguised as or bundled with ordinary content) can be unintentionally downloaded from dubious sources, e.g. unofficial and free file-hosting (freeware) websites, P2P sharing networks (BitTorrent, Gnutella, eMule, etc.) and other third party downloaders.

Threat Summary:
Name Nlah virus
Threat Type Ransomware, Crypto Virus, Files locker
Detection Names BitDefender (Trojan.GenericKDZ.67550), Emsisoft (Trojan.GenericKDZ.67550 (B)), ESET-NOD32 (A Variant Of Win32/Kryptik.HDTC), Kaspersky (Trojan-Ransom.Win32.Stop.mw), Full List Of Detections (VirusTotal)
Encrypted Files Extension .nlah
Ransom Demanding Message _readme.txt
Ransom Amount $980 or $490
Cyber Criminal Contact helpdatarestore@firemail.cc and helpmanager@mail.ch
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 This malware is designed to show a fake Windows Update window and modify the Windows "hosts" file to prevent users from accessing cyber security websites (more information below).
Distribution methods Infected email attachments (macros), torrent websites, malicious ads, unofficial activation and updating tools.
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.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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How to protect yourself from ransomware infections?

It is recommended not to open suspect and/or irrelevant emails, especially any attachments or links found in them - as they are a source of a potential system infection. All downloads must be done via official and verified channels. It is advised to always activate and update products with tools/functions provided by legitimate developers. Since illegal activation tools ("cracks") and third party updaters are often used to distribute malware. To ensure device and user safety, it is crucial to have a reputable anti-virus/anti-spyware installed. This software must be kept up-to-date, used to perform regular system scans and to remove detected threats. If your computer is already infected with Nlah, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in Nlah ransomware's text file ("_readme.txt"):

ATTENTION!

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:
hxxps://we.tl/t-BtumiluQaI
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:
helpmanager@mail.ch

Reserve e-mail address to contact us:
restoremanager@airmail.cc

Your personal ID:
-

Screenshot of files encrypted by Nlah (".nlah" extension):

Files encrypted by Nlah ransomware (.nlah extension)

Screenshot of fake Windows update pop-up displayed during the encryption:

Fake Windows pop-up displayed by Nlah during the encryption

IMPORTANT NOTE! - As well as encrypting data, ransomware-type infections from the Djvu malware family also add a number of entries to the Windows "hosts" file. The entries contain URLs of various websites, most of which are related to malware removal. This is done to prevent users from accessing malware security websites and seeking help. Our website (PCrisk.com) is also on the list. Removing these entries, however, is simple - you can find detailed instructions in this article (note that, although the steps are shown in the Windows 10 environment, the process is virtually identical on all versions of the Microsoft Windows operating system).

Screenshot of websites added to Windows hosts file:

Tro Ransomware adding websites to Windows Hosts file

There are currently two versions of Djvu ransomware infections: old and new. The old versions were designed to encrypt data by using a hard-coded "offline key" whenever the infected machine had no internet connection or the server was timing out/not responding. Therefore, some victims were able to decrypt data using a tool developed by cyber security researcher, Michael Gillespie, however, since the encryption mechanism has been slightly changed (hence the new version, released in August, 2019), the decrypter no longer works and it is not supported anymore. If your data has been encrypted by an older version, you might be able to restore it with the another tool developed by Emsisoft and Michael Gillespie. It supports a total of 148 Djvu's variants and you can find more information, as well as download link and decryption instructions in Emsisoft's official page.

Screenshot of Djvu decryption tool by Emsisoft and Michael Gillespie:

Djvu ransomware decrypter by Michael Gillespie and Emsisoft

Additionally, Emsisoft is now providing a service that allows to decrypt data (again, only if it was encrypted by Djvu variants released before August, 2019) for those victims who have a pair of the same file before and after the encryption. All victims have to do is upload a pair of original and encrypted file to Emsisoft's Djvu decryption page and download the aforementioned decryption tool (the download link will be provided after uploading files). Note that the file processing may take some time so be patient. It is also worth mentioning that the system must have an Internet connection during the entire decryption process, otherwise it will fail.

Screenshot of Emsisoft's Djvu decryption service page:

Djvu ransomware decryption service by Emsisoft

Nlah ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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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 Nlah 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 Nlah 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 Nlah 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 Nlah 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 Nlah, 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 Nlah 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 Nlah 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 pcrisk.com 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.

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Malware activity

Global malware activity level today:

Medium threat activity

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

QR Code
Nlah virus QR code
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