How to remove DMR64 ransomware from operating systems

Also Known As: DMR64 virus
Distribution: Low
Damage level: Severe

DMR64 ransomware removal instructions

What is DMR64?

Discovered by MalwareHunterTeam, DMR64 is a malicious program categorized as ransomware. It operates by encrypting the data of infected devices and demanding ransom payments for decryption. During the encryption process, all affected files are renamed using the following pattern: "[id=victim's_ID]original_filename.DMR64". The pattern comprises a string of characters with the unique ID, original filename and ".DMR64" extension. For example, "1.jpg" might appear as something similar to "[id=1E857D00]1.jpg.DMR64", and so on for all compromised files. After this process is complete, DMR64 creates an HTML application ("!!! READ THIS !!!.hta"), which contains the ransom message.

The text presented in the ransom message informs victims that their data has been encrypted. If users want to recover it, the message states that they must contact the developers of DMR64 ransomware using the email address provided. In the subject/title field of the message, users must include their ID (generated individually for each victim, and listed within the message and filename of each encrypted file). If the cyber criminals do not respond within 48 hours, victims are urged to use the alternative email address. Users are warned that decryption keys (necessary for data recovery) will only be stored for one week. Therefore, it is implied that, unless victims make contact and/or pay the ransom within this period, their files will remain encrypted (i.e., they will experience permanent data loss). The size of the demanded payment is not specified, only that this sum will depend on how quickly users establish contact. The ransom must be paid in the Bitcoin cryptocurrency and the message contains links about how and where Bitcoins can be acquired. Free decryption of one file is offered as 'proof' that recovery is possible. This test file cannot exceed 1 MB (non-archived) and must not contain valuable information (e.g. databases, backups, large excel sheets or similar). The message ends with warnings. Victims are alerted that renaming the encrypted files and/or decryption with third party tools/software might cause permanent data damage. In most cases of ransomware infections, decryption without the involvement of the individuals responsible is not viable. Manual decryption might only be possible if the malware in question is still in development and/or has key flaws/bugs. Regardless, you are strongly advised against communicating with and/or meeting the demands of cyber criminals. People who pay often do not receive the promised decryption tools/software. Their data remains encrypted and useless, and they also experience financial loss. Removing DMR64 will prevent it from further encryption, however, this will not restore already affected files. The only solution is to recover data from a backup, if one was made before the attack and was stored separately.

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

DMR64 decrypt instructions (!!! READ THIS !!!.hta)

ZEPPELINMerlAsd, and Rooster865qqZ are examples of other ransomware infections. All malicious software within this category encrypts data and demands payment for decryption. Infections differ by the cryptographic algorithm (symmetric or asymmetric) used for encryption and the ransom sizes. Demands typically vary between three and four digit sums (in USD). Cyber criminals tend to prefer digital currencies (e.g. cryptocurrencies), since these transactions are difficult/impossible to trace. To ensure data safety, you are advised to keep backups on remote servers and/or unplugged storage devices. Ideally, multiple backups should be stored in several different locations.

How did ransomware infect my computer?

Ransomware and other malware mainly proliferates via spam campaigns, trojans, untrustworthy download channels, illegal activation ("cracking") tools and fake updaters. Large scale spam campaigns are used to send emails with infectious files attached (or containing links leading to them). These deceptive messages are usually disguised as "official", "important", "urgent", "priority" and so on. The attachments come in various formats (e.g. archive and executable files, Microsoft Office and PDF documents, JavaScript, etc.). When these files are run, executed or otherwise opened, it initiates the infection. I.e., when a dangerous file is opened, it begins downloading/installing malware. Trojans are malicious programs capable of causing chain infections. Untrustworthy download sources such as unofficial and free file-hosting sites, P2P sharing networks (BitTorrent, Gnutella, eMule, etc.) and other third party downloaders can offer malicious content for download (e.g. under the guise of regular software and/or bundled with it). Rather than activating any licensed products, illegal activation tools ("cracks") can also download/install malware. Fake updaters infect systems by misusing the weaknesses of outdated programs and/or simply install malware rather than the promised updates.

Threat Summary:
Name DMR64 virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension .DMR64
Ransom Demanding Message !!! READ THIS !!!.hta
Cyber Criminal Contact Agent.DMR@protonmail.com and Agent.DMR@aol.com
Detection Names Avast (Win32:Malware-gen), BitDefender (Trojan.GenericKD.32786061), ESET-NOD32 (Win32/Filecoder.NZL), Kaspersky (Trojan-Ransom.Win32.Gen.ucd), Full List Of Detections (VirusTotal)
Rogue Process Name Windows Explorer.exe
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)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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How to protect yourself from ransomware infections

Suspicious and/or irrelevant emails should not be opened. This also applied to attachments or links found in dubious mail, since these files are the origin of a potential infection. Use official and verified download channels. Software activation and updating should be performed with tools/functions provided by genuine developers. Illegal activation ("cracking") tools and third party updaters are high-risk and should be avoided. Have a reputable anti-virus/anti-spyware suite installed and kept up-to-date. Additionally, these programs should be used to perform regular system scans and for the removal of detected threats/issues. If your computer is already infected with DMR64, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in DMR64 ransomware pop-up window ("!!! READ THIS !!!.hta"):

All your files have been encrypted!
Your documents, photos, databases and other important files have been encrypted with strongest encryption. you can return all your files if you want to restore files, write us to the e-mail: Agent.DMR@protonmail.com
Write this ID in the subject e-mail:1E857D00
Only in case you do not receive a response from the first email address withit 48 hours, please use this alternative email adress: Agent.DMR@aol.com
It is in your interest to respond as soon as possible to ensure the restoration of your files, because we wont keep your decryption keys at our server more than one week. The price depends on how fast you write to us.
Free decryption as guarantee
Before paying you can send us up to 1 file for free decryption. The total size of files must be less than 1Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
How to obtain Bitcoins
You can buy bitcoin from here:
https:localbitcoins.com/buy_bitcoins
Also you can find other places to buy Bitcoins and beginners guide here:
http:www.coindesk.com/information/how-can-i-buy-bitcoins/
Attention!
Do not rename encrypted files.
Using another tools could corrupt your files, in case of using third party software we don't give guarantees that full recovery is possible so use it on your own risk.

Screenshot of files encrypted by DMR64 (".DMR64" extension):

Files encrypted by DMR64 ransomware (.DMR64 extension)

Screenshot of DMR64 ransomware process in Windows Task Manager:

DMR64 Ransomware process

DMR64 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:
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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 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 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).

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EaseUS Data Recovery Wizard Pro

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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

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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 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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Medium threat activity

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