DMA Locker Ransomware

Also Known As: DMA Locker virus
Distribution: Low
Damage level: Severe

DMA Locker ransomware removal instructions

What is DMA Locker?

DMA Locker is ransomware that stealthily infiltrates systems and encrypts stored data . Following successful encryption, DMA Locker displays a message stating that victims must pay a ransom in exchange for a private key required to decrypt their files.

The displayed lockscreen contains all information regarding encryption and payment (for example, 'What is DMA Locker', 'What is Bitcoin?', etc.) It is stated that the victim must pay a 15 Bitcoin (BTC) ransom (at time of research, equivalent to US$6491.25), otherwise the encrypted data will be lost. In addition, users are provided with step-by-step payment instructions. Note that ransoms demanded by other ransomware-type viruses usually fluctuates between 0.5 and 1.5 BTC, making DMA Locker's ransom considerably higher. Unfortunately, there are currently no tools capable of decrypting the files. Therefore, the best solution to this problem is to restore your system from a backup.

Screenshot of a message encouraging users to contact the developers of DMA Locker ransomware to decrypt their compromised data:

DMA-Locker decrypt instructions

Update - February 3, 2016. Cyber criminals have updated the ransom demanding message:

dma locker ransomware updated version

There are many ransomware-type viruses sharing similarities with DMA Locker including, for example, CryptoWall, CryptoJoker, XRTN, and TeslaCrypt. These ransomware viruses have identical behavior - they infiltrate systems, encrypt files, and demand for a ransom. There is no guarantee that your files will be decrypted even if you pay the ransom. In doing so, you will support the malicious business of cyber criminals. For these reasons, you should never pay the ransom or attempt to contact the developers of ransomware. DMA Locker and other similar viruses are often proliferated via malicious email attachments, P2P networks, or fake software updates. Be careful when opening suspicious emails and downloading data from untrusted sources. In addition, keep your installed software up-to-date and use a legitimate anti-spyware or anti-virus suite.

Computer users who are infected with an older variant of DMA Locker ransomware can use a derypter created by Fabian Wosar to decrypt their files for free.

DMA Locker demanding ransom payment to decrypt files:

All your personal files are LOCKED!
What’s happened?
*All your important files (including hard disks, networks disks, flash, USB) are encrypted.
*All of files are locked with asymmetric algorithm using AES-256 and then RSA-2048 cipher.
*You are not possible to unlock your files because all your backups are removed.
*Only way to unlock your files is to pay us 536 GBP in Bitcoin currency (2.0 BTC). After payment we will send you decryption key automatically, which allow you to unblock files. If files unlocking procedure is already working, you can easily torn off your computer and continue files unlocking after nest startup. To continue healing your files, copy and paste the same decryption key to the “decryption key” field and press “Decrypt” button. The files recovering will be continued.

Update 28 April 2016 - Cyber criminals have updated DMA Locker ransomware. It now asks or a 4 BTC ransom and has and has a new ransom demanding message. The encrypted files now get a !DMALOCK3.0 prefix.

Screenshot of cryptinfo.txt file (ransom demanding message created by DMA Locker ransomware):

dma locker dmalock3 updated variant cryptinfo.txt file

Text presented in cryptinfo.txt file:

Attention! ! !
All of your copies of your system have been permanently deleted and the data on all partitions and workstations have been encrypted!

Stay calm.

You can recover all your data by making a payment of 4 BTC (1072 GBP) in Bitcoin currency in order to receive a decryption key.

In order to purchase Bitcoins you can use
After buying BTC send the equivalent of 4 BTC (1072 GBP) to our BTC address:


After payment contact us to receive your decryption key. In mail title write your unique ID: DMALOCK -

To ensure you that you can recover your data we are able to decrypt two files of your choice that are not larger that 1MB!

Even if your antivirus has removed our program, your data may be still recovered!

Update - May 20, 2016 - Cyber criminals have released a new variant of this ransomware (now called “DMALocker 4.0”) This variant doesn’t add any extensions to the encrypted files, it adds a content prefix "!DMALOCK4.0" (first 9 bytes of encrypted files contains a string !DMALOCK4). Ransom demanding note (cryptinfo.txt) is only present in the installation folder.

Screenshot of “DMALocker 4.0” ransomware:

dmalocker 4.0 ransomware

Ransom demanding message:

All your personal files are LOCKED!

* All your important files (including => hard disks, network disks, flash, USB) are encrypted.
* All the files are locked with asymmetric algorithm using AES-256 and then RSA-2048 chipper.
* You can’t restore your files because all your backups have been deleted.
* Only way to recover your files is to pay us 1 BTC
* As a proof your can decrypt 1 file FOR FREE by clicking here:


1. If your are OFFLINE you can contact us via e-mail:, dma4004@zerobit.en ( and we will provide you instructions about how to decrypt your files.
2. To pay us, you have to use Bitcoin currency. You can easily buy Bitcoins at following sites:

3. If you already have Bitcoins, pay us 1 BTC to the following Bitcoin address:
4. If you have paid, enter following site to get your transaction id.
Click this button to show tutorial how to locate your transaction id:
5. When you have located Transaction ID, paste it to ‘TRANSACTION ID’ field below and, click the “CHECK PAYMENT” button. Confirming your payment by our servers can take up to several hours (we require some bitcoins transaction confirmations). When your payment has been confirmed, the ‘DECRYPT FILES’ button will enable, just click it to decrypt your files.

DMA Locker 4.0 now has a website explaining victims how to pay the ransom:

dmalocker 4.0 website

Text presented in this website:

Your files have been encrypted!
To decrypt your files you have to pay 1 Bitcoins (BTC).
If the payment is not made and confirmed until [Date] the cost of decrypting your files will increase to 1.5 BTC.
If the payment is not made and confirmed until [Date] we will destroy the key to decrypt your files and it will be impossible to decrypt your files anymore.

How to make payment?
1. Firstly, you have to buy Bitcoins (BTC). You can buy Bitcoins easily at the following site (you can skip this step if you already have Bitcoins).
2. Send 1 BTC to the following Bitcoin address - You don’t have to send the exact amount above. You have to send at least this amount for our systems to confirm payment.
3. Locate the Transaction ID of your payment, enter it into the DMA Locker ’TRANSACTION ID’ field and click the ‘CHECK PAYMENT’ button. To locate the Transaction ID of your payment please refer to the instructions below.
4. When you have entered a valid Transaction ID, our system are going to confirm it. We require at least 3 Bitcoin Transaction confirmations. It can take some time to confirm the Transaction, please be patient. After our systems have confirmed the Transaction, the DMA Locker program will unlock the “DECRYPT” button. Just click it to decrypt all your files :)

How to locate the Transaction ID of your payment?
1. Firstly, go to the following site:
2. There will be a list of Transactions displayed. Just locate your Transaction on the list (your Transaction should be on top of the list).
3. Use the image below to locate your Transaction ID.

DMA Locker 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:
▼ DOWNLOAD Malwarebytes By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Quick menu:

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 a ransomware that is not supported by ID Ransomware, you can always try searching the internet by using certain keywords (for example, ransom message title, file extension, provided contact emails, cryptowallet 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, cyber criminals 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 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 EaseUS Data Recovery Wizard Pro. 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).

▼ Download
EaseUS Data Recovery Wizard Pro

By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Trial version of EaseUS Data Recovery Wizard Pro is capable of scanning drives and listing recoverable files - to restore them, you must purchase a license.

Step 1: Perform a scan.

Hover your mouse over the partition you wish to scan and select "Scan". You can also select a specific folder, or click shortcut icons to scan the Desktop or Recycle Bin: Scanning the storage drive with EaseUS Data Recovery Wizard PRO (step 1)

Wait for EaseUS Data Recovery Wizard Pro 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 hundreds 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: Scanning the storage drive with EaseUS Data Recovery Wizard PRO (step 2)

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. Note also that the trial version of EaseUS Data Recovery Wizard Pro is only capable of scanning drives and listing recoverable files - to restore them, you must purchase a license: Recovering data with EaseUS Data Recovery Wizard Pro

Step 3: Save the scan session (optional).

We recommend that you save the scanning session once you have completed recovery, in case you decide to recover additional files later. Simply click the "Save Scan Session" icon in the upper-right corner of the screen and choose the location for the file to be saved. This will save a lot of time, since you will not need to re-scan the storage drive the next time you wish to restore something. Bear in mind, however, that data removed after the scanning session has finished will not be listed: Saving scan session in EaseUS Data Recovery Wizard Pro

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 necessary information on Microsoft's documentation web page.

Data backups: The most reliable backup method 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 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. Therefore, you should consider using an application to create data backups locally.

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EaseUS Todo Backup

By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for EaseUS Todo Backup. 30 days free trial available.

We recommend using the EaseUS Todo Backup application. The "Home" edition of EaseUS Todo Backup is usually more than adequate for regular users, however, the "Business" edition is more suitable for companies and large computer networks. The EaseUS Todo Backup application provides extensive data protection features. You can easily create backups, and encrypt and compress them for enhanced protection and storage saving purposes. It also allows you to set backup schedules, create bootable devices, and restore the system if a crash occurs. You can easily choose where to store the created backup: locally; uploaded to an external drive; FTP; cloud storage, or elsewhere. In summary, EaseUS Todo Backup is an all-in-one tool, which provides all features required to properly backup your data.

Creating a data backup:

The backup process is virtually identical regardless of the item (file, partition, entire system) you wish to backup. Taking the File Backup feature as an example:

Step 1: Choose which item to backup.

Click on the "Menu" icon in the upper-left corner of the screen to reveal the menu and select "File Backup": Creating data backups with EaseUS Todo Backup tool (step 1)

Select the files you want to backup. You can also enter a name and description of the backup that will be created: Creating data backups with EaseUS Todo Backup tool (step 2)

Step 2: Change the default settings.

The EaseUS Todo Backup application provides a variety of additional options that can be added/modified while creating the backup. For example, you can encrypt data (add a password), select the compression rate (how much the backup should be compressed), performance (how many system resources should be allocated), add an email notification (you receive an email once the process is complete) and so on.

To open the options window, click the "Backup options" button in the lower-left corner of the screen: Creating data backups with EaseUS Todo Backup tool (step 3)

Select the settings you want to change and click "Save". You can also reset your changes by clicking "Reset to initial settings": Creating data backups with EaseUS Todo Backup tool (step 4)

Step 3: Select the backup destination.

As mentioned above, EaseUS Todo Backup allows you to choose where backups are saved - locally or externally.

Click the "Browse..." button and select the location you want the backup to be saved: Creating data backups with EaseUS Todo Backup tool (step 5)

Step 4: Safety measures and process completion.

Depending on the location you have chosen, there are a number of measures you should or should not take. If you are uploading to an internet-connected location (for example, Cloud storage, FTP, etc.), be sure to maintain your internet connection, otherwise you will have to start again. The same applies to external storage devices - do not unplug them until the process is complete.

The progress bar displays estimated time remaining until completion. Large backups (hundreds of gigabytes) can take hours to create (depending on storage device speed, internet connection, etc.). Therefore, the application also allows you to optionally choose what the system should do (shut down, sleep or hibernate) once the process has finished: Creating data backups with EaseUS Todo Backup tool (step 6)

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

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 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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DMA Locker virus QR code
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