Djvu VirusRansomwareRemoval Guide

Mmdt Virus Removal Guide (+Decrypt .mmdt files)

Mmdt – Ransomware

Mmdt is a malicious software functioning as typical ransomware. Michael Gillespie, the popular virus researcher, very first discovered this new name in the DJVU ransomware family.

Mmdt was created for the sole purpose to encrypt all popular file types. Logically, as soon as the encryption is effectively achieved, the users are not able to get access to them. Mmdt ransomware adds its own “.mmdt” to all the encrypted files. For example, the file “price_list.xls”, when modified by Mmdt, will be entitled as “price_list.xls.mmdt”. Once the file encryption is accomplished, Mmdt puts its own unique text file (_readme.txt) into all the folders that keep the encrypted files.

The message mentioned by document requesting for the random os very comparable to the notices offered by other ransomware dangers coming from the DJVU family. The caution generally shows that the information has been secured and the only solution to get access to it is to use an unique standalone key. Regretfully, this declaration is definitely true.

The method to secure the files used by Mmdt is not totally investigated. However, there is no doubt that each computer system owner may be provided an unique decryption key, which is absolutely special. It is incredibly tough to recover the information without the appropriate key in place.

“Don’t worry, you can return all your files!”, from text file message:

Don't worry, you can return all your files! virus

One more peculiarity of the Mmdt virus is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the complete control by the crooks who have released the Mmdt infection into the internet. In order to get the key and restore the important information, the users are informed to get in touch with the scams through e-mail or by telegram and to pay the ransom in the amount of $980.

The message likewise says that individuals should contact the Mmdt authors within 72 hours upon the minute of the data file encryption. The alert suggests that by doing so individuals will acquire a 50% discount rate, therefore, the ransom amount drops down to $490.

No matter what the amount of the ransom is, we strongly advise that you do not pay the ransom. There is no warranty that these online criminals will keep their promises, so they may not care at all what the victims feel about the file encryption, even when the quantity of the ransom is received into their accounts. For this reason, paying ransom frequently does not result in an effective recovery. So, the users may just lose their money for absolutely nothing.

Similarly, we advise you not to call the scams as they instruct. Do not move cash into their wallets. There are no applications that could split the Mmdt virus or restore the data at no cost. Therefore, the only correct choice is to bring back the information from possible backups (if readily available).

Virus Summary

NameMmdt Ransomware
File Extensionmmdt
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES-256 algorithm (CFB mode) encryption algorithm. Once the encryption is completed, the ransomware adds its special .mmdt extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsLokas, Besub, Nusar
Mmdt Removal Tool   GridinSoft Anti-Malware
Mmdt Decryption Tool   Emsisoft Djvu Decryptor

Do not forget that the Web is now filled with infections similar to the Mmdt virus. For example, this particular threat is essentially similar to Brusaf and other ransomware-type infections. These destructive energies have been developed in order to encrypt the essential data and express the demand for the users to pay the ransom. All these infections utilize the similar algorithm to create the specific key for successful files decryption.

Unless the Mmdt ransomware is still under the development procedure or has got some hidden bugs, it is not possible to restore the data by hand. Hence, the only working solution to avoid the loss of your crucial information is to regularly preserve up-to-date backups of all your essential files.

Another important piece of advice is to keep the backups on special storage not connected to your primary device. For instance, you may keep it on the USB Flash Drive, or some external disk drive, or by using the cloud data storage services. Keeping the backups on your system drive is really dangerous, given that the backup may also be encrypted by the Mmdt .

Leaks for the Mmdt ransomware attack.

Mmdt utilizes lots of courses to infiltrate the vulnerable computers. It is not certain what specific technique was utilized in your case, however, the intrusion might take place through the following channels:

  • bundling with third-party programs, mainly freeware;
  • spam emails from the unidentified senders;
  • sites offering complimentary hosting;
  • P2P (peer-to-peer) torrent software.

There are times when the Mmdt might camouflage itself as some genuine application, for example, through the misleading informs demanding installation of some software update. This is the most common trick utilized by the scams to inject the Mmdt ransomware files into the system. This way users partially take part in its installation, without clearly comprehending the danger.

In addition, the frauds might send out unsolicited spam email with challenging alerts motivating the people to open suspicious accessories or click on some download links, for instance, those motivating the people to open certain photos, text files, tax files and other information.

No doubt, opening these files or clicking on the harmful links might basically damage the system. Fake Acrobat Reader upgrade notices may result in the Mmdt ransomware seepage. Likewise, downloading the split software may in addition contain the ransomware installer. The last however not the least, installation of Mmdt might take place through some Trojan horses that may be installed stealthily into the system and without the user’s direct authorization and even approval.

Preventing the Mmdt ransom virus injection.

Obviously, there is no absolute guarantee that your computer system will be always devoid of any malware attacks, nevertheless, we wish to share some beneficial ideas with you to make it safer. Ensure to pay very close attention while searching the web and specifically while downloading cost-free programs. Do not open any suspicious e-mail accessories, specifically if the sender is not known to you.

Do not forget that specific freeware installer may also consist of some other additional apps in the package. These extra applications may be very damaging. It is of utmost importance to keep your anti-virus software application and your operating system in basic to be always properly updated.

It is quite rational that downloading cracked apps is prohibited, nevertheless, in addition, such unapproved apps use may likewise bring severe damage to your PC. For this reason, do not download any split programs. Plus, the reality that your present anti-virus did not safeguard the system from the Mmdt ransomware is a good reason for you to reassess your choices and switch to another program that can render the safeguarding functions on a much better level.

Below please find the quotation from the Mmdt text file:


 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:
 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:

 Our Telegram account:

Screenshot of files with “.mmdt” extension added by the virus:”

Mmdt Ransomware - encrypt files with .mmdt extension

Use GridinSoft Anti-Malware to remove Mmdt ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

Use Emsisoft Decryptor for restore mmdt files

You can get Emsisoft Decryptor by clicking the button below:

  Emsisoft Decryptor

  1. Run the decryptor as an administrator. The license terms will show up, which you have to agree to by clicking the “Yes” button.
  2. Once the license terms are accepted, the primary decryptor user interface opens.
  3. By default, the decryptor will pre-populate the locations to decrypt with the currently connected drives and network drives. Additional locations can be added using the Add” button.
  4. Decryptors typically offer various options depending on the particular malware family. The available options are located in the Options tab and can be enabled or disabled there. You can find a detailed list of the available Options below.
  5. After you have added all the locations you want to decrypt to the list, click the “Decrypt” button to start the decryption process. The screen will switch to a status view, informing you about the current process and decryption status of your files
  6. The decryptor will inform you once the decryption process is finished. If you require the report for your personal records, you can save it by clicking the “Save log” button. You can also copy it straight to your clipboard to paste it into emails or forum posts if you are asked to.
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Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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