Remove MMDecrypt from the operating system

Also Known As: MMDecrypt virus
Damage level: Severe

What is MMDecrypt?

MMDecrypt ransomware encrypts files and changes their extensions, creates two ransom messages, displays a pop-up window and changes the desktop wallpaper. It renames all encrypted files by appending the ".TRSomware" extension to filenames. For example, "1.jpg" becomes "1.jpg.TRSomware".

It stores the "@Lütfen_Beni_Oku!@.txt" and "@Please_Read_Me@.txt" text files (ransom messages) in all folders that contain encrypted files.

It changes the wallpaper by using an image called "@Wallpaper@.png" and displays a pop-up window by launching the "@MMDecrypt0r@.exe" executable file. Both of these files can be found on the desktop. MMDecrypt is a new variant of KesLan ransomware and was discovered by GrujaRS.

MMDecrypt creates ransom messages in English and Turkish. These state that victims cannot access their files unless they decrypt them. The cost of decryption is $100 in Bitcoins.

This ransom must be paid by sending cryptocurrency to the wallet address provided in MMDecrypt's pop-up window (opened by the "@MMDecrypt0r@.exe" executable file) and the "@Lütfen_Beni_Oku!@.txt" and "@Please_Read_Me@.txt" text files. After payment, victims must click the "Contact US" button in the pop-up window and send a screenshot of the completed transaction.

Cyber criminals should then return a decryption key ("password") that, once entered, supposedly decrypts encrypted files. It is mentioned that the ransom must be paid within seven days of encryption. After this period, victims will be unable to recover their files.

Despite this, do not trust cyber criminals behind any ransomware. They often do not provide tools or keys (to supposedly decrypt data), even if victims meet all demands and pay the ransoms. Unfortunately, files encrypted by ransomware cannot generally be decrypted without tools/keys held only by the cyber criminals who designed the malicious program.

Typically, the only way to recover files without risking being scammed is to restore them from a backup. Note that uninstalling ransomware from the system does not make files accessible (they remain encrypted), however, it does prevent ransomware from causing any further encryption.

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

MMDecrypt decrypt instructions (@MMDecrypt0r@.exe)

Righ, CILLA and LockBit are other malware infections categorized as ransomware. These are just some examples from many other programs of this type. Typically, they prevent victims from accessing their files by encryption and create ransom messages that contain instructions about how to contact cyber criminals, pay the ransom, etc.

Main differences are usually cost of decryption and cryptographic algorithm (symmetric or asymmetric) used to encrypt files. In most cases, it is impossible to decrypt files without specific tools held by the cyber criminals who created the ransomware - unless, in rare cases, the ransomware is not finished, contains bugs, flaws, etc.

Therefore, have data backed up and keep it on a remote server and/or unplugged storage device.

How did ransomware infect my computer?

Typically, cyber criminals proliferate ransomware using spam campaigns (emails), untrustworthy file and/or software download channels, fake software updating tools, unofficial activation tools and Trojans. They often send emails with malicious files attached to many people and hope that some will open the file.

If opened, it installs ransomware or other malware. Typically, cyber criminals send emails that contain malicious Microsoft Office or PDF documents, JavaScript files, archives such as ZIP, RAR, executable files (.exe), and so on. Another way to proliferate malicious software is using dubious file or software download channels.

Examples of download sources used to distribute malware are unofficial pages, free file hosting or freeware download websites, Peer-to-Peer networks (torrent clients, eMule), third party downloaders, and so on. People who download files through sources of this kind risk downloading a malicious file that, if opened, will install malicious software such as ransomware.

Malicious files are usually disguised as regular and harmless. Furthermore, systems can be infected through fake updating tools. These infect computers by exploiting bugs/flaws of outdated software that is installed on the operating system, or by installing malicious software rather than updates and fixes.

Unofficial activation tools supposedly activate licensed (paid) software free of charge, however, the are often designed by cyber criminals who seek to infect systems with malicious software. Trojans are malicious programs that cause installation of other malware - if a system is infected with a Trojan, it is very likely that it will be infected with other malware as well.

Threat Summary:
Name MMDecrypt virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension .TRSomware
Ransom Demanding Message @Please_Read_Me@.txt, @Lütfen_Beni_Oku!@.txt, desktop wallpaper and pop-up window.
Ransom Amount $100 in Bitcoins
Bitcoin Wallet Address $1MyAGtQZTGndY2wRGD5pscNJbHir3jFDib
Detection Names AVG (FileRepMalware), Cybereason (Malicious.560286), ESET-NOD32 (VBA/Kryptik.BO), Kaspersky (HEUR:Trojan.Script.Agent.gen), 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)

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How to protect yourself from ransomware infections

To avoid computer infection with various malware, do not trust emails that are irrelevant, received from unknown, suspicious addresses, and so on. If an email of this type contains a web link or attachment, it should not be opened. Unofficial software activation tools are illegal and can be used to proliferate malware - you are strongly advised not to activate software with them.

The same applies to updating of installed programs. They should be updated through implemented functions or tools that are provided by official software developers. The only trustworthy download channels are official websites. The other tools mentioned above can be used to distribute malicious files/programs.

Finally, it is important to have reputable anti-virus or anti-spyware software installed. Scan the operating system with it regularly and keep it updated. If your computer is already infected with MMDecrypt, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate this ransomware.

Text presented in MMDecrypt ransomware pop-up window ("@MMDecrypt0r@.exe" file):

Main | Encrypted Files
Oops your files have been encrypted!

What Happened to My Computer?
Your important files are encrypted.
Many of your documents, photos, videos, databases and other files are no longer accessible because they have been encrypted. Maybe you are busy looking for a way to recover your files, but do not waste your time. Nobody can recover your files without our decryption service.

Can I Recover My Files?
We guarantee that you can recover all your files safely and easily. But you don't have enough time.
If you do not pay within 7 days, you will not be able to recover your files forever.

How do I pay?
Payment is accepted only Bitcoin. Click for more information.
Please check the current price of Bitcoin and buy some Bitcoin. For more information, click .
And send the correct amount to the address specified in this window.
After your payment, click and send us a picture of your shipment and a mail address.
Best check in time: Monday to Friday from 10:00 to 16:00 (GMT + 3).
We will send the password to the email address you sent us after payment is made.
And constantly check your email.
After sending the password to you, click and you can recover all of your files by entering the password we sent you from the e-mail to the Key section and clicking .

We strongly recommend that you do not remove this software and disable your anti-virus for a while until you pay and process the payment. If your antivirus software is updated and automatically removes it, you won't be able to recover your files even if you pay!
And don't forget to leave your internet open or we won't be able to contact you.
Send $100 worth of bitcoin to this address:
Contact US Decrypt

Screenshot of MMDecrypt text file English version ("@Please_Read_Me@.txt"):

MMDecrypt ransomware text file (@Please_Read_Me@.txt)

Text in this file:

Q: What happened to my files?

A: Your important files are encrypted. This means that you can no longer access them until they are decrypted.
   If you follow our instructions, we guarantee that you can decrypt all your files quickly and safely!
   Let's start decoding!

Q: What should I do?

A: You must pay the service fee for decryption first.
   Please send $ 100 bitcoin to this bitcoin address: 1MyAGtQZTGndY2wRGD5pscNJbHir3jFDib

   Then, please locate an application file named "@ MMDecrypt0r @ .exe". It is decryption software.
   (You may need to disable your antivirus software for a while.)

Q: How can I trust you?

A: Don't worry about decryption.
   We will definitely decrypt your files because if we deceive users, no one will trust us.

Screenshot of MMDecrypt text file Turkish version ("@Lütfen_Beni_Oku!@.txt"):

MMDecrypt ransomware text file (@Lütfen_Beni_Oku!@.txt)

Text in this file:

Q: Dosyalarıma ne oldu?

A: Önemli dosyalarınız şifrelenmiştir. Bu, şifresi çözülene kadar onlara artık erişemeyeceğiniz anlamına gelir.
   Talimatlarımızı yerine getirirseniz, tüm dosyalarınızın şifresini hızlı ve güvenli bir şekilde çözebileceğinizi garanti ederiz!
   Şifre çözmeye başlayalım!

Q: Ne yapayım?

A: İlk önce şifre çözme için servis ücreti ödemeniz gerekir.
   Lütfen bu bitcoin adresine 100$ değerinde bitcoin gönderiniz: 1MyAGtQZTGndY2wRGD5pscNJbHir3jFDib

   Daha sonra, lütfen "@MMDecrypt0r@.exe" adlı bir uygulama dosyası bulun. Şifre çözme yazılımıdır.
   (Virüsten koruma yazılımınızı bir süre devre dışı bırakmanız gerekebilir.)
Q: Nasıl güvenebilirim?

A: Şifre çözme konusunda endişelenmeyin.
   Dosyalarınızı kesinlikle şifresini çözeceğiz çünkü kullanıcıları aldatırsak kimse bize güvenmeyecek.

Screenshot of MMDecrypt desktop wallpaper ("@Wallpaper@.png"):

MMDecrypt ransomware wallpaper (@Wallpaper@.png)

Screenshot of files encrypted by MMDecrypt (".TRSomware" extension):

Files encrypted by MMDecrypt ransomware (.TRSomware extension)

MMDecrypt ransomware removal:

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Video suggesting what steps should be taken in case of a ransomware infection:

Quick menu:

Reporting ransomware to authorities:

If you are a victim of a ransomware attack we recommend reporting this incident to authorities. By providing information to law enforcement agencies you will help track cybercrime and potentially assist in the prosecution of the attackers. Here's a list of authorities where you should report a ransomware attack. For the complete list of local cybersecurity centers and information on why you should report ransomware attacks, read this article.

List of local authorities where ransomware attacks should be reported (choose one depending on your residence address):

Isolating the infected device:

Some ransomware-type infections are designed to encrypt files within external storage devices, infect them, and even spread throughout the entire local network. For this reason, it is very important to isolate the infected device (computer) as soon as possible.

Step 1: Disconnect from the internet.

The easiest way to disconnect a computer from the internet is to unplug the Ethernet cable from the motherboard, however, some devices are connected via a wireless network and for some users (especially those who are not particularly tech-savvy), disconnecting cables may seem troublesome. Therefore, you can also disconnect the system manually via Control Panel:

Navigate to the "Control Panel", click the search bar in the upper-right corner of the screen, enter "Network and Sharing Center" and select search result: Disconnecting computer from the Internet (step 1)

Click the "Change adapter settings" option in the upper-left corner of the window: Disconnecting computer from the Internet (step 2)

Right-click on each connection point and select "Disable". Once disabled, the system will no longer be connected to the internet. To re-enable the connection points, simply right-click again and select "Enable". Disconnecting computer from the Internet (step 3)

Step 2: Unplug all storage devices.

As mentioned above, ransomware might encrypt data and infiltrate all storage devices that are connected to the computer. For this reason, all external storage devices (flash drives, portable hard drives, etc.) should be disconnected immediately, however, we strongly advise you to eject each device before disconnecting to prevent data corruption:

Navigate to "My Computer", right-click on each connected device, and select "Eject": Ejecting external storage devices

Step 3: Log-out of cloud storage accounts.

Some ransomware-type might be able to hijack software that handles data stored within "the Cloud". Therefore, the data could be corrupted/encrypted. For this reason, you should log-out of all cloud storage accounts within browsers and other related software. You should also consider temporarily uninstalling the cloud-management software until the infection is completely removed.

Identify the ransomware infection:

To properly handle an infection, one must first identify it. Some ransomware infections use ransom-demand messages as an introduction (see the WALDO ransomware text file below).

Identify ransomware-type infection (step 1)

This, however, is rare. In most cases, ransomware infections deliver more direct messages simply stating that data is encrypted and that victims must pay some sort of ransom. Note that ransomware-type infections typically generate messages with different file names (for example, "_readme.txt", "READ-ME.txt", "DECRYPTION_INSTRUCTIONS.txt", "DECRYPT_FILES.html", etc.). Therefore, using the name of a ransom message may seem like a good way to identify the infection. The problem is that most of these names are generic and some infections use the same names, even though the delivered messages are different and the infections themselves are unrelated. Therefore, using the message filename alone can be ineffective and even lead to permanent data loss (for example, by attempting to decrypt data using tools designed for different ransomware infections, users are likely to end up permanently damaging files and decryption will no longer be possible even with the correct tool).

Another way to identify a ransomware infection is to check the file extension, which is appended to each encrypted file. Ransomware infections are often named by the extensions they append (see files encrypted by Qewe ransomware below).

Identify ransomware-type infection (step 2)

This method is only effective, however, when the appended extension is unique - many ransomware infections append a generic extension (for example, ".encrypted", ".enc", ".crypted", ".locked", etc.). In these cases, identifying ransomware by its appended extension becomes impossible.

One of the easiest and quickest ways to identify a ransomware infection is to use the ID Ransomware website. This service supports most existing ransomware infections. Victims simply upload a ransom message and/or one encrypted file (we advise you to upload both if possible).

Identify ransomware-type infection (step 3)

The ransomware will be identified within seconds and you will be provided with various details, such as the name of the malware family to which the infection belongs, whether it is decryptable, and so on.

Example 1 (Qewe [Stop/Djvu] ransomware):

Identify ransomware-type infection (step 4)

Example 2 (.iso [Phobos] ransomware):

Identify ransomware-type infection (step 5)

If your data happens to be encrypted by ransomware that is not supported by ID Ransomware, you can always try searching the internet by using certain keywords (for example, a ransom message title, file extension, provided contact emails, crypto wallet addresses, etc.).

Search for ransomware decryption tools:

Encryption algorithms used by most ransomware-type infections are extremely sophisticated and, if the encryption is performed properly, only the developer is capable of restoring data. This is because decryption requires a specific key, which is generated during the encryption. Restoring data without the key is impossible. In most cases, cybercriminals store keys on a remote server, rather than using the infected machine as a host. Dharma (CrySis), Phobos, and other families of high-end ransomware infections are virtually flawless, and thus restoring data encrypted without the developers' involvement is simply impossible. Despite this, there are dozens of ransomware-type infections that are poorly developed and contain a number of flaws (for example, the use of identical encryption/decryption keys for each victim, keys stored locally, etc.). Therefore, always check for available decryption tools for any ransomware that infiltrates your computer.

Finding the correct decryption tool on the internet can be very frustrating. For this reason, we recommend that you use the No More Ransom Project and this is where identifying the ransomware infection is useful. The No More Ransom Project website contains a "Decryption Tools" section with a search bar. Enter the name of the identified ransomware, and all available decryptors (if there are any) will be listed.

Searching for ransomware decryption tools in nomoreransom.org website

Restore files with data recovery tools:

Depending on the situation (quality of ransomware infection, type of encryption algorithm used, etc.), restoring data with certain third-party tools might be possible. Therefore, we advise you to use the Recuva tool developed by CCleaner. This tool supports over a thousand data types (graphics, video, audio, documents, etc.) and it is very intuitive (little knowledge is necessary to recover data). In addition, the recovery feature is completely free.

Step 1: Perform a scan.

Run the Recuva application and follow the wizard. You will be prompted with several windows allowing you to choose what file types to look for, which locations should be scanned, etc. All you need to do is select the options you're looking for and start the scan. We advise you to enable the "Deep Scan" before starting, otherwise, the application's scanning capabilities will be restricted.

Recuva data recovery tool wizard

Wait for Recuva to complete the scan. The scanning duration depends on the volume of files (both in quantity and size) that you are scanning (for example, several hundred gigabytes could take over an hour to scan). Therefore, be patient during the scanning process. We also advise against modifying or deleting existing files, since this might interfere with the scan. If you add additional data (for example, downloading files/content) while scanning, this will prolong the process:

Recuva data recovery tool scan time

Step 2: Recover data.

Once the process is complete, select the folders/files you wish to restore and simply click "Recover". Note that some free space on your storage drive is necessary to restore data:

Recuva data recovery tool recovering data

Create data backups:

Proper file management and creating backups is essential for data security. Therefore, always be very careful and think ahead.

Partition management: We recommend that you store your data in multiple partitions and avoid storing important files within the partition that contains the entire operating system. If you fall into a situation whereby you cannot boot the system and are forced to format the disk on which the operating system is installed (in most cases, this is where malware infections hide), you will lose all data stored within that drive. This is the advantage of having multiple partitions: if you have the entire storage device assigned to a single partition, you will be forced to delete everything, however, creating multiple partitions and allocating the data properly allows you to prevent such problems. You can easily format a single partition without affecting the others - therefore, one will be cleaned and the others will remain untouched, and your data will be saved. Managing partitions is quite simple and you can find all the necessary information on Microsoft's documentation web page.

Data backups: One of the most reliable backup methods is to use an external storage device and keep it unplugged. Copy your data to an external hard drive, flash (thumb) drive, SSD, HDD, or any other storage device, unplug it and store it in a dry place away from the sun and extreme temperatures. This method is, however, quite inefficient, since data backups and updates need to be made regularly. You can also use a cloud service or remote server. Here, an internet connection is required and there is always the chance of a security breach, although it's a really rare occasion.

We recommend using Microsoft OneDrive for backing up your files. OneDrive lets you store your personal files and data in the cloud, sync files across computers and mobile devices, allowing you to access and edit your files from all of your Windows devices. OneDrive lets you save, share and preview files, access download history, move, delete, and rename files, as well as create new folders, and much more.

You can back up your most important folders and files on your PC (your Desktop, Documents, and Pictures folders). Some of OneDrive’s more notable features include file versioning, which keeps older versions of files for up to 30 days. OneDrive features a recycling bin in which all of your deleted files are stored for a limited time. Deleted files are not counted as part of the user’s allocation.

The service is built using HTML5 technologies and allows you to upload files up to 300 MB via drag and drop into the web browser or up to 10 GB via the OneDrive desktop application. With OneDrive, you can download entire folders as a single ZIP file with up to 10,000 files, although it can’t exceed 15 GB per single download.

OneDrive comes with 5 GB of free storage out of the box, with an additional 100 GB, 1 TB, and 6 TB storage options available for a subscription-based fee. You can get one of these storage plans by either purchasing additional storage separately or with Office 365 subscription.

Creating a data backup:

The backup process is the same for all file types and folders. Here’s how you can back up your files using Microsoft OneDrive

Step 1: Choose the files/folders you want to backup.

Click the OneDrive icon in the taskbar

Click the OneDrive cloud icon to open the OneDrive menu. While in this menu, you can customize your file backup settings.

Select Help & Settings and click Settings

Click Help & Settings and then select Settings from the drop-down menu.

Select the Backup tab and click Manage backup

Go to the Backup tab and click Manage backup.

Select folders to backup and click Start backup

In this menu, you can choose to backup the Desktop and all of the files on it, and Documents and Pictures folders, again, with all of the files in them. Click Start backup.

Now, when you add a file or folder in the Desktop and Documents and Pictures folders, they will be automatically backed up on OneDrive.

To add folders and files, not in the locations shown above, you have to add them manually.

Select a file manually and copy it

Open File Explorer and navigate to the location of the folder/file you want to backup. Select the item, right-click it, and click Copy.

Paste the copied file in the OneDrive folder to create a backup

Then, navigate to OneDrive, right-click anywhere in the window and click Paste. Alternatively, you can just drag and drop a file into OneDrive. OneDrive will automatically create a backup of the folder/file.

File statuses in OneDrive folder

All of the files added to the OneDrive folder are backed up in the cloud automatically. The green circle with the checkmark in it indicates that the file is available both locally and on OneDrive and that the file version is the same on both. The blue cloud icon indicates that the file has not been synced and is available only on OneDrive. The sync icon indicates that the file is currently syncing.

Click Help & Settings and click View Online

To access files only located on OneDrive online, go to the Help & Settings drop-down menu and select View online.

Click the Settings cog and click Options

Step 2: Restore corrupted files.

OneDrive makes sure that the files stay in sync, so the version of the file on the computer is the same version on the cloud. However, if ransomware has encrypted your files, you can take advantage of OneDrive’s Version history feature that will allow you to restore the file versions prior to encryption.

Microsoft 365 has a ransomware detection feature that notifies you when your OneDrive files have been attacked and guide you through the process of restoring your files. It must be noted, however, that if you don’t have a paid Microsoft 365 subscription, you only get one detection and file recovery for free.

If your OneDrive files get deleted, corrupted, or infected by malware, you can restore your entire OneDrive to a previous state. Here’s how you can restore your entire OneDrive:


1. If you're signed in with a personal account, click the Settings cog at the top of the page. Then, click Options and select Restore your OneDrive.

If you're signed in with a work or school account,  click the Settings cog at the top of the page. Then, click Restore your OneDrive.

2. On the Restore your OneDrive page, select a date from the drop-down list. Note that if you're restoring your files after automatic ransomware detection, a restore date will be selected for you.

3. After configuring all of the file restoration options, click Restore to undo all the activities you selected.

The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups.

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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.

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