Infected with Nemucod Ransomware? Need to decrypt your files?

What is Nemucod Ransomware

Nemucod is a trojan, that downloads ransomware virus on your computer. This virus claims it uses RSA-1024 algorithm to encrypt user personal files and appends .crypted to those files. In fact, files are encrypted with more simple XOR algorithm. Ransomware encodes various types of files: documents, music, e-mails, videos, photos, game files. Decryption is possible with the special decrypter by EmsiSoft, that we will describe later. It is also possible to restore files from shadow copies, using instructions below. Virus creates text file Decrypt.txt with instructions to pay the ransom of 0.60358 BitCoins (approximately $250$). It is strongly recommended not to disclose your bank credentials to the attackers. Follow this tutorial to remove Nemucod Ransomware and decrypt files with .crypted extension using special tools or manually.

Update: Use following service to identify the version and type of ransomware you were attacked by: ID Ransomware. Also check following website for possible decryptor: Emsisoft Decryptors.

nemucod ransomware virus

How Nemucod Ransomware infected your PC

Nemucod Ransomware distributes on computers using popular methods (malicious email attachments, torrent (P2P) networks, fake invoices). Nemucod Ransomware uses TOR network for receiving ransom, which makes it very difficult to trace the attacker. Ransom is asked to be paid in BitCoins, that also makes the task difficult for the police, as user in this network are often anonymous. Encryption starts in the background. Way to protect your computer from such threats is to use antiviruses with crypto-protection like HitmanPro.Alert with CryptoGuard.

First of all don’t panic. Follow these easy steps below.

1. Start your computer in Safe Mode with networking. To do that, restart your computer, before your system starts hit F8 several times. This will stop system from loading and will show Advanced boot options screen. Choose Safe mode with networking option from the options list using up and down arrows on your keyboard and hit Enter.
2. Log in to the system infected with the Nemucod Ransomware virus. Launch your Internet browser and download a reliable anti-malware program and start a full system scan. Once the scan is complete, review scan results and remove all entries detected.

Recommended Solution:

Norton is a powerful removal tool. It can remove all instances of newest viruses, similar to Nemucod Ransomware – files, folders, registry keys.


Download Norton*Trial version of Norton provides detection of computer viruses for FREE. To remove malware, you have to purchase the full version of Norton.

Step 2: Remove following files and folders of Nemucod Ransomware:

Remove following registry entries:

HKCU\Software\Classes\.2MGvFO\ ayC5
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Crypted %Temp%\502105.txt
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\ [unreadable_char]

Remove following files and folders:

%UserProfile%\Local Settings\Application Data\Upkfmedia

How to decrypt files infected by Nemucod Ransomware (.crypted files)?

Use automated decryption tools

emsisoft decryptor for Nemucod Ransomware

There is ransomware decryptor from EmsiSoft that can decrypt .crypted files. It is free and may help you restore .crypted files by Nemucod Ransomware virus. Download it here:

Download Emsisoft Nemucod Decrypter

You can also try to use manual methods to restore and decrypt .crypted files.

Decrypt .crypted files manually

Restore the system using System Restore

system restore

Although, latest versions of Nemucod Ransomware remove system restore files, this method may help you partially restore your files. Give it a try and use standard System Restore to revive your data.

  1. Initiate the search for ‘system restore
  2. Click on the result
  3. Choose the date before the infection appearance
  4. Follow the on-screen instructions

Roll the files back to the previous version

Previous versions can be copies of files and folders created by Windows Backup (if it is active) or copies of files and folders created by System Restore. You can use this feature to restore files and folders that you accidentally modified or deleted, or that were damaged (in our case – Nemucod Ransomware by Nemucod Ransomware). This feature is available in Windows 7 and later versions.

windows previous versions

  1. Right-click the file and choose Properties
  2. Open the Previous Version tab
  3. Select the latest version and click Copy
  4. Click Restore

Restore .crypted files using shadow copies

shadow explorer gui

  1. Download and run Shadow Explorer.
  2. Select the drive and folder where your files are located and date that you want to restore them from.
  3. Right-click on folder you want to restore and select Export.
  4. Once the scanning process is done, click Recover to restore your files.

Protect your computer from ransomware

hitmanpro alert with cryptoguard

Most modern antiviruses can protect your PC from ransomware and crypto-trojans, but thousands of people still get infected. There are several programs that use different approach t protect from ransomware and lockers. One of the best is HitmanPro.Alert with CryptoGuard. You may already know HitmanPro as famous cloud-based anti-malware scanner. Check out ultimate active protection software from SurfRight.

Download HitmanPro.Alert with CryptoGuard

Information provided by: Alexey Abalmasov

One comment

Leave a Reply

Your email address will not be published. Required fields are marked *