How to avoid data encryption by NEMTY REVENGE 2.0 ransomware

Also Known As: NEMTY REVENGE 2.0 virus
Distribution: Low
Damage level: Severe

NEMTY REVENGE 2.0 ransomware removal instructions

What is NEMTY REVENGE 2.0?

NEMTY REVENGE 2.0 ransomware is malicious software discovered by Michael Gillespie. People with files encrypted by ransomware cannot regain access without the use of a decryption key. To obtain the key, victims are urged to pay a ransom to the cyber criminals who designed NEMTY REVENGE 2.0. This ransomware renames all encrypted files by adding the ".NEMTY_[victim's ID]" extension. For example, "1.jpg" to "1.jpg.NEMTY_AZW1EKL". It also creates a ransom message within "NEMTY_AZW1EKL-DECRYPT.txt" (the filename also includes the victim's ID), which contains instructions about how to obtain a decryption key. As the name suggests, NEMTY REVENGE 2.0 is not the first version of this ransomware - it is very likely that the previous version had flaws, now resolved in 2.0.

The "NEMTY_AZW1EKL-DECRYPT.txt" ransom message states that all files that have a new extension (in this case, ".NEMTY_AZW1EKL") are encrypted. To decrypt them, victims are required to contact these cyber criminals by sending an email to elzmflqxj@tutanota.de or helpdesk_nemty@aol.com. The message can contain one attachment (.png, .jpg, .bmp, or. gif file). As 'proof' that NEMTY REVENGE 2.0 developers have a decryption key, they offer to decrypt the file free of charge. After making contact, victims are supposedly provided with further instructions about how to pay the ransom. Typically, only the cyber criminals who designed the ransomware can help victims to decrypt their files, since only they have valid tools. Note that cyber criminals cannot be trusted and often do not provide these tools, even if they are paid. Since there are no tools capable of decrypting files encrypted by NEMTY REVENGE 2.0 (at least, not free of charge), the only way to recover them without the risk of being scammed is to restore them from a backup. Even if ransomware is removed from the system, all affected files remain encrypted. Removing the ransomware simply prevents it from causing any further encryption.

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

NEMTY REVENGE 2.0 decrypt instructions

NEMTY REVENGE 2.0 is similar to most other ransomware-type programs. Some other examples are Hdmr, Xxxinstant, and PhobosImposter. Typically, they are designed to encrypt data (prevent victims from accessing their files) and keep it in this state unless a ransom is paid. Common differences are cost of a decryption tool and/or key and encryption algorithm (symmetric or asymmetric) used to lock data. Unfortunately, it is impossible to decrypt files without using tools held only by ransomware developers, unless the ransomware is has bugs/flaws, is still in development, etc. To avoid data loss caused by ransomware in future, have your data backed up and stored it on a remote server such as Cloud and/or unplugged storage device.

How did ransomware infect my computer?

Ransomware-type software and other malware is proliferated mostly through emails (spam campaigns), Trojans, software 'cracking' tools, dubious software download channels and fake software updaters. Cyber criminals often send emails that contain a malicious file (attachment). For example, Microsoft Office or PDF document, JavaScript file, executable file (.exe), archive file such as ZIP, RAR and so on. Their main aim is to trick people into opening the attachment (or web link that leads to download of the malicious file). They often disguise their emails as official, important, legitimate, etc. Once the attached file is opened, it installs ransomware or other malware. Trojans are programs that can infect systems, but only if they are already installed on them. When installed, Trojans download and install other malicious programs, and thus cause chain infections. Tools that activate paid software free of charge are often used to proliferate malware - they install malicious software rather than activating programs or operating systems. Files that are downloaded from unofficial websites, free file hosting or freeware download pages, Peer-to-Peer networks (torrent clients or eMule), various third party downloaders can cause installation of malicious programs. Cyber criminals often use these download sources to spread malware. Generally, infected files are disguised as harmless, however, once downloaded and opened, they infect systems with malicious software. Unofficial software updaters often download and install viruses rather than updating software. They can also cause damage (install malware) by exploiting bugs/flaws of installed software that is out-of-date.

Threat Summary:
Name NEMTY REVENGE 2.0 virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension .NEMTY_[victim's ID]
Ransom Demanding Message NEMTY_[victim's ID]-DECRYPT.txt
Cyber Criminal Contact elzmflqxj@tutanota.de, helpdesk_nemty@aol.com
Detection Names Avast (Win32:Evo-gen [Susp]), BitDefender (Gen:Heur.Ransom.Imps.3), ESET-NOD32 (A Variant Of Win32/Filecoder.Nemty.A), Kaspersky (HEUR:Trojan.Win32.Generic), Full List Of Detections (VirusTotal)
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.
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.
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

If a received email is irrelevant, sent from unknown address, and a file is attached, do not to trust or open it. Do not open attachments or web links without being sure that it is safe to do so. The safest way to download software is via direct links and official websites. The tools, sources mentioned above should not be trusted, since they are often used to proliferate rogue, often malicious software. Installed software should be updated using tools or implemented functions provided by official software developers. Third party (unofficial) tools should never be used. Installed, licensed software should be activated properly. Software 'cracking' tools are illegal and can lead to installation of malicious software. Have reputable antivirus or anti-spyware software installed and scan the system for threats regularly. If your computer is already infected with NEMTY REVENGE 2.0, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in NEMTY REVENGE 2.0 ransomware text file ("NEMTY_[victim's ID]-DECRYPT.txt"):

---> NEMTY REVENGE 2.0 <---

Don't worry, some of your files have extension .NEMTY_AZW1EKL and they are encrypted.
But you can return them!

In confirmatiom, that we have private decryption key,
We can provide test decryption for 1 file (png,jpg,bmp,gif).
It's a business, if we can't provide full decryption, other people won't trust us.

There is no way to decrypt your files without our help.
Don't trust anyone. Even your dog.

main mail: elzmflqxj@tutanota.de
if no answer: helpdesk_nemty@aol.com

Don't change decryption key below!!!

NEMTY DECRYPTION KEY:
-

Screenshot of files encrypted by NEMTY REVENGE 2.0 (".NEMTY_[victim's ID]" extension):

Files encrypted by NEMTY REVENGE 2.0

NEMTY REVENGE 2.0 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 NEMTY REVENGE 2.0 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 NEMTY REVENGE 2.0 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 NEMTY REVENGE 2.0 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 NEMTY REVENGE 2.0 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 NEMTY REVENGE 2.0, 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 NEMTY REVENGE 2.0 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 NEMTY REVENGE 2.0 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
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