NMoreira Ransomware

Also Known As: NMoreira virus
Distribution: Low
Damage level: Severe

NMoreira ransomware removal instructions

What is NMoreira?

NMoreira is a ransomware-type virus identical to AiraCrop and related to Team XRat. This ransomware infiltrates the system and encrypts files using asymmetric cryptography. During encryption, NMoreira appends names of encrypted files with the ".maktub" extension (this is unrelated to Maktub ransomware). Following successful encryption, NMoreira creates a text file ("Recupere seus arquivos. Leia-me!.txt") and places it on the desktop. The file contains a ransom-demand message.

The ransom message is in Portuguese and, thus, cyber criminals predominantly target users from Portugal. The message states that the files are encrypted and encourages victims to contact NMoreira's developers via an email address provided (contatomaktub@email.tg). Further instructions are then provided. As mentioned above, NMoreira encrypts files using asymmetric algorithm and, thus, public (encryption) and private (decryption) keys are generated. The private key is stored on a remote server controlled by cyber criminals (NMoreira's developers). Therefore, victims must pay a ransom to receive it. The size of ransom is currently unconfirmed, however, the cost of AiraCrop decryption is .5 Bitcoin (currently equivalent to ~$370). It is safe to assume that the prices are similar. In any case, you should never attempt to contact these people or pay any ransom. Research shows that criminals often ignore victims, despite payments made - you will simply be scammed. There are currently are no tools capable of restoring files encrypted by NMoreira - you can only restore files/system from a backup.

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

NMoreira decrypt instructions

There are dozens of viruses that share similarities with NMoreira. Examples include Locky, CTB-Locker, JohnyCryptor, and many others. All have identical behavior - the encrypt files and make ransom demands. Ransomware-type viruses commonly use asymmetric cryptography (unlike symmetric encryption, the decryption keys are different). Therefore, the only major difference is size of ransom. These viruses are often distributed using third party software download sources (peer-to-peer [P2P] networks, freeware download websites, free file hosting sites, etc.), spam emails (infectious attachments), trojans, and fake software updaters. Therefore, be very cautious when opening files received from suspicious email addresses and downloading software from unofficial sources. Furthermore, use a legitimate anti-virus/anti-spyware suite and keep your installed applications up-to-date. Poor knowledge and rushing is often the reason for computer infections. The key to computer safety is caution.

Update 30 November, 2016 - Security researcher from Emsisoft Fabian Wosar has created a free tool capable of decrypting files compromised by this ransomware. Download it HERE.

nmoreira ransomware decrypter

Ransom-demand message in Portuguese (presented within "Recupere seus arquivos. Leia-me!.txt" file):

Olá, seus arquivos foram criptografados.
A única forma de tê-los de volta, é atraves de um software juntamente com sua chave privada.
Caso haja interesse em recuperar seus arquivos, entre em contato pelo seguinte email:
No campo do email, me envie sua chave pública que está logo a baixo.
Te responderei o mais rápido possível.

Screenshot of files encrypted by NMoreira (".maktub" extension):

NMoreira decrypt instructions

NMoreira ransomware removal:

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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 NMoreira 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 NMoreira 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 NMoreira 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 NMoreira 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 NMoreira, 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 Malwarebytes Anti-Ransomware, which artificially implant group policy objects into the registry to block rogue programs such as NMoreira ransomware.

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 NMoreira 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
NMoreira virus QR code
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