MMUZ Ransomware. How to decrypt .mmuz files?

Written by William Reddy

If you cannot open your images, documents, or data and also see the .mmuz extension on them, your system is definitely infected with Mmuz ransomware. It pertains to STOP/Djvu ransomware group

Mmuz ransomware encrypts personal files spotted on the victim’s computer with the extension “.mmuz” and then leaves the ransom note in each folder which contains encrypted files. The instructions are put on the victim’s desktop in the “readme.txt” file. Its activity is basically comparable to other examples of the same family: Stax, Rguy, Uigd.

What is Mmuz Ransomware?

NameMmuz Virus
Ransomware family1DJVU/STOP2 ransomware
Ransomware note_readme.txt
RansomFrom $490 to $980,
SymptomsThe images, videos, and other documents have the “.mmuz” extension and cannot be opened by any programs
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Mmuz is file-encrypting ransomware that prevents regular access to your text files, Excel tables, videos and pictures by ciphering them. It marks the encrypted files with the “.mmuz” extension. Then Mmuz ransomware adds a ransom note (readme.txt) to each folder. In it, you can see the guidance to pay the ransom ($490-$980 in Bitcoin) to a certain Bitcoin wallet. The AES-256 or RSA-1028 cipher it uses to encrypt the files is not decryptable with contemporary computers. Even quantum computers that already exist will likely spend thousands of years to get the decryption key.

How dangerous is the Mmuz ransomware?

When Mmuz ransomware gets on your PC, it will check your computer for photos, videos, and also important documents. It [ciphers all widespread file formats- .psd, .doc, .docx, .xls, .xlsx, .pdf, .jpeg, .png, et cetera. When these files are located, the ransomware will encrypt them and change their extension to “.mmuz” so that you understand what happened.

After the Mmuz ransomware encrypted the data on your PC, it will drop the last “readme.txt” file on the desktop. In addition to the money transferring instructions, the victims also see the emails to contact the fraudsters – and

Here is the money ransom note that the Mmuz ransomware shows to its victims:


Don't worry, you can return all your files!
All your files like pictures, 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:

Reserve e-mail address to contact us:

How did the Mmuz ransomware get on my computer?

The Mmuz ransomware spreads by placing websites to get hacked programs or games. Cybercriminals that distribute this ransomware are very clever, and aim to correspond with modern trends. New games releases, new popular movies – Mmuz developers make whatever to get their money on that. One of the most popular strategies these burglars utilize is one-day sites with torrent downloading links. Nevertheless, following the modern news is not the only way these criminals use. Methods that have already become classic, such as e-mail spamming, are also ordinary for STOP/Djvu ransomware distribution.

Malicious email spam

The example of email spamming that may lead to Mmuz ransomware injection

Avoiding this ransomware does not need a lot of initiative. Considering the ordinary rules of computer hygiene will significantly minimize all hazards. Keep in mind that launching all documents you receive on e-mail is not a good option. Even worse scenario is to allow macros in Microsoft Office documents. However, it is far better to avoid the malware intrusion at the moment when you have just opened the e-mail message. Checking the sender’s address can point out a lot about what you can expect, and also when you see things like “”– it is likely a trustworthy email. At the same time, stuff that tries to look like Amazon or FedEx shipping notification, but uses the email address of “”– should make you be on the alarm. Above, you can see the illustration of such a message.

Illegal sources of different digital things require some extra explanation. Violating copyright policy already throws you to the possibility of being fined. However, utilizing torrent trackers or third-party websites to download “free” programs also exposes you to a wide range of malware. No one can oversee unidentified people that launch the torrent seeding or release the hacked program version on the website with pirated program.

Mmuz virus removal instructions.

Download Trojan Killer Portable

Trojan Killer Portable Download

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This guide below shows how to use Trojan Killer Portable3 for Mmuz virus detection and removal:

  • STEP 1. Download and install Trojan Killer.

  • STEP 2. Click on "Finish".

  • STEP 3. Wait until necessary updates are downloaded and installed.

  • STEP 4. Select computer scan type.

  • STEP 5. The software will begin scanning your computer.

  • STEP 6. Click on "Cure PC".

Restore the files encrypted by the Mmuz ransomware

In most cases, it’s impossible to recover the files encrypted by the Mmuz ransomware because the private key needed to unlock the encrypted files is only available through cybercriminals. However, we’ve listed one option you can use to recover your files below.

Warning! Make sure you remove the ransomware from your system first, otherwise, it will repeatedly encrypt your files.

If your files were encrypted with an offline key, there is a chance you can recover them by using Emsisoft Decryptor for the STOP/Djvu decryption tool. Follow the below guide to recover your files using the Emsisoft Decryptor for STOP/Djvu.

  1. You can download Emsisoft Decryptor for STOP Djvu by clicking this link.
  2. When the decryptor has finished downloading, double-click on “decrypt_STOPDjvu.exe” to run this program on your computer.
  3. Click the “Decrypt” button to start the decryption process for Mmuz files. The screen will switch to a status view, informing you about your files’ current process and decryption status.
  4. The decryptor will inform you once the decryption process will be finished. If you require the report for your records, you can save it by clicking the “Save log” button.

If the Emsisoft Decryptor can’t decrypt your .mmuz files and you do not plan on paying the ransom, it is advised that you make an image of the encrypted drives so that you can decrypt them in the future.

Your computer should now be free of the Mmuz ransomware infection. However, suppose your current antivirus allowed this malicious program on your computer. In that case, you might want to consider purchasing the full-featured version of Trojan Killer to protect against these types of threats in the future.

MMUZ Ransomware — How To Remove Virus & Decrypt Files?

Name: MMUZ Virus

Description: MMUZ Virus is a STOP/DJVU family of ransomware-type virus. It encrypts files, video, photos, documents. Encrypted files can be tracked by a specific mmuz extension. MMUZ ransomware asks victims for a ransom fee about $490 - $980 in Bitcoin.

Offer price: 480

Currency: $

Operating System: Windows

Application Category: Virus

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About the author

William Reddy

I am from Ireland. My parents bought me a computer when I was 11, and several months after I have got a virus on this PC. I decided to enter the INSA Centre Val de Loire university after being graduated from the school. This French educational institution was offering a brand-new cybersecurity course. After getting the master's degree in cybersecurity, I've started working as a virus analyst in a little anti-malware vendor.

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