DDT Ransomware

Also Known As: DDT virus
Distribution: Moderate
Damage level: Severe

DDT ransomware removal instructions

What is DDT?

DDT is a part of GlobeImposter, a family of ransomware-type programs. Like most programs of this type, DDT encrypts files stored on a computer and keeps them locked unless a ransom is paid. In other words, unless victims buy a decryption tool that can decrypt data encrypted by DDT. Information on how to contact cyber criminals and purchase the tool is provided in the "how_to_back_files.html" file. Additionally, this ransomware renames all encrypted files by appointing the ".{dresdent@protonmail.com}DDT" extension. For example, it renames "1.jpg" to "1.jpg.{dresdent@protonmail.com}DDT" and so on. The person who discovered DDT is Michael Gillespie.

Before purchasing the decryption tool victims can send one image file to DDT's developers via dresdent@protonmail.com that they supposed to decrypt for free. The email must contain a personal ID that is appointed to each victim individually. After that cyber criminals will send the instructions on how to make a payment. According to the text in the "how_to_back_files.html" file, the only way to decrypt files is to use the tool that only DDT's developers can provide. Victims are informed that any attempts to decrypt files using some other software or to run ant-virus tools will result in permanent data loss. Unfortunately, there is no other tool that could be capable of decrypting files encrypted with DDT. In other words, DDT's developers are the only ones who have it. That is the case with most ransomware-type programs and encryptions caused by them. However, it does not mean that cyber criminals (ransomware developers) can be trusted. Typically, they do not keep their promises and do not send their victims decryption tools, even if their demands to pay a ransom are met. Simply said, people who trust them usually become victims of a scam. To avoid that we recommend to restore files using data backup.

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

DDT decrypt instructions

In most cases ransomware-type programs are quite similar, here are some other examples: Luboversova148, Davda and SECURE. Their developers use them with a purpose to extract money from people by encrypting their files and forcing them to pay a ransom/buy decryption tool. The main differences usually are encryption algorithms (symmetric or asymmetric) that are used to lock files and prices of decryption. Typically, victims have no other choice but to contact cyber criminals. Decryptions without their help are possible only if ransomware-type program is has some bugs, flaws (is not fully developed). It is the main reason why it is always a good idea to have a data backup created. However, it is important not to keep it on a computer, but to store it on a remote server or unplugged storage device.

How did ransomware infect my computer?

It is unknown how exactly DDT's developers promote, nevertheless, it is very likely that they do it using one of the popular ways. Typically, cyber criminals spread ransomware and other malicious programs through emails (spam campaigns), unreliable software download sources, trojans, fake/unofficial software updating tools and 'cracking' tools. When they spam campaigns, they simply send emails that contain attachments. These attachments, if opened, start downloading and then installing malicious software. Here are examples of files that they usually attach: Microsoft Office documents, PDFs, archive files (ZIP, RAR and others), JavaScript and executables (.exe and other files of this type). Another way to distribute malware is through Peer-to-Peer (P2P) networks, freeware download websites, third party software downloaders, free file hosting pages and other similar tools. These sources can be used present malicious files as harmless and legitimate. However, when downloaded and opened, they install ransomware or other high-risk malware. Trojans are programs that are designed to cause chain infections. Simply said, they are malicious programs that cause downloads, installations of other software of this kind. However, to be able to do it, trojans must be already installed. Unofficial software updaters infect systems by downloading and installing malicious programs instead of updating or fixing installed software, or they achieve it by exploiting outdated software's bugs/flaws. Various 'cracking' tools are programs that supposed to activate other software, in other words, to bypass paid activation. However, they often used as tools to distribute malware. Simply said, they often download and install malicious programs.

Threat Summary:
Name DDT virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .{dresdent@protonmail.com}DDT
Ransom Demanding Message how_to_back_files.html
Cyber Criminal Contact dresdent@protonmail.com
Detection Names Avast (Win32:Malware-gen), BitDefender (Generic.Ransom.GlobeImposter.5587844B), ESET-NOD32 (A Variant Of Win32/Filecoder.FV), Kaspersky (Trojan-Ransom.Win32.Purgen.aho), Full List Of Detections (VirusTotal)
Symptoms Can't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay 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.

To eliminate DDT virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

If some received email is irrelevant, it is sent from unknown address and contains some attachment, it should be ignored. We strongly recommend not to open files (or web links) that are presented in emails of this kind. Download software from official sources, using direct download links. Do not trust other sources for that. Update installed programs properly - update them with implemented functions or tools that provided by official software developers. Software activations should be performed properly as well. Third party activation tools are illegal and are often used to spread malware. And finally, have a reputable anti-virus or anti-spyware suite installed, make sure that it is always up do date and run scans with it regularly. If your computer is already infected with DDT, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in DDT ransomware's HTML file ("how_to_back_files.html"):



To recover data you need decryptor.
To get the decryptor you should:
Send 1 test image or text file dresdent@protonmail.com.
In the letter include your personal ID (look at the beginning of this document).

We will give you the decrypted file and assign the price for decryption all files
After we send you instruction how to pay for decrypt and after payment you will receive a decryptor and instructions We can decrypt one file in quality the evidence that we have the decoder.

Only dresdent@protonmail.com can decrypt your files
Do not trust anyone dresdent@protonmail.com
Do not attempt to remove the program or run the anti-virus tools
Attempts to self-decrypting files will result in the loss of your data
Decoders other users are not compatible with your data, because each user's unique encryption key

Appearance of DDT's html file (GIF):

DDT Ransomware html file appearance

Screenshot of files encrypted by DDT (".{dresdent@protonmail.com}DDT" extension):

Files encrypted by DDT

DDT ransomware removal:

Instant automatic removal of DDT virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of DDT virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the DDT virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the DDT ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining DDT ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of DDT are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by DDT, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as DDT ransomware.

Note that Windows 10 Fall Creators Update includes "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default this feature automatically protects files stored in Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here's more information on how to get this update and add additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove DDT ransomware:

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 virus and spyware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
DDT virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of DDT virus on your mobile device.
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Platform: Windows

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