How to eliminate Dalle ransomware from the system?

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

Dalle ransomware removal instructions

What is Dalle?

Dalle is a high-risk ransomware infection that belongs to Djvu ransomware family. It was firstly discovered by malware researcher Michael Gillespie. Dalle is designed to stealthily infiltrate computers and encrypt most of stored files. While encrypting, Dalle appends filenames with ".dalle" extension (thus, its name). Encrypted data instantly becomes unusable. Additionally, Dalle creates a text file named "_readme.txt" and drops its copy in every existing folder.

As with other ransomware from Djvu family, Dalle's text file delivers a ransom-demanding message stating that data is encrypted and that victims must purchase a decryption tool/key in order to restore it. Unfortunately, claims that a unique decryption key is necessary to restore data are true. The algorithm used by Dalle ransomware is currently unconfirmed. However, it is sure that each victim gets a unique decryption key. The problem is that all keys are stored in a remote server controlled by Dalle's developers, which is why victims have to pay a ransom in order to receive it. Price for the decryption is $980 and victims have to contact crooks via email/telegram in order to receive payment/decryption instructions. The message also notes that victims who'll contact within 72 hours will receive a 50% discount (the price will drop to $490). In addition, victims are allowed to attach one selected file (which cannot contain any "valuable information"). The file will then be restored and sent back - crooks do this in order to prove that the decryption is actually possible and to gain victim's trust. However, no matter how low or high the price is, it should never be paid. Ransomware developers in general are notorious for ignoring victims once payments are submitted, meaning that paying usually gives no positive result and users merely get scammed. For this reason, all encouragements to contact these persons and especially submit payments should be ignored. As mentioned above, each victim gets a unique decryption key. However, if the infected machine has no Internet connection or if the server is not responding Dalle will encrypt data using a so-called "offline key". For this reason, we advise you to try restoring data with Michael Gillespie's decryption tool. The only other possible solution is to restore everything from a backup, if there is one created.

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

Dalle decrypt instructions

Internet is full of ransomware infections that share similarities with Dalle. Amigo X-3, Non, LooCipher - these are only few examples from a long list. Almost every single ransomware compromises data (typically, by encrypting) and makes ransom demands (developers offer a paid recovery). Type of used cryptography and price for the decryption are typically the only major differences. In most cases, unfortunately, data is encrypted using AES, RSA, and other similar algorithms that generate unique decryption keys. Hence, it is impossible to restore data without developers interference. That is unless the virus is fully developed and has no bugs/flaws. Ransomware infections present a strong case for maintaining regular data backups. However, be sure to store them in a remote server or either unplugged storage device, because locally stored backups will be compromised alongside with regular data. Additionally, we advise to have multiple backup copies stored in different locations, because there's always a chance that used device/server will be damaged.

How did ransomware infect my computer?

Ransomware infections are typically proliferated using the following tools/methods: trojans, fake software updaters and cracks, unofficial software download sources, and email spam campaigns. Trojans are malicious applications that stealthily infiltrate computers with an intention of downloading/installing additional malware. Fake updaters infect computers by exploiting outdated software's bugs/flaws or simply downloading and installing malware instead of the actual updates. Same goes for fake cracking tools which inject malware rather than providing users with access to paid features. Third party download sources like freeware download websites, free file hosting sites, Peer-to-Peer (P2P) networks, and similar are used to spread malware by presenting it as legitimate software. This way users get tricked manual download/installation of malware. Last but not least are email spam campaigns which are also used in a similar manner. Cyber criminals send hundreds of thousands of emails consisting of malicious attachments and deceptive messages encouraging recipients to open. Attachments are also likely to be presented as some important documents (invoices, receipts, bills, etc.) - this way crooks create the impression of legitimacy and increase the chance of tricking recipients. In summary, the main reasons for computer infections are poor knowledge and reckless behavior.

Threat Summary:
Name Dalle virus
Threat Type Ransomware, Crypto Virus, Files locker
Detection Names (370E.tmp.exe) Avast (Win32:Malware-gen), BitDefender (Trojan.GenericKD.41391252), ESET-NOD32 (A Variant Of Win32/Kryptik.GUEY), Kaspersky (HEUR:Trojan.Win32.Chapak.gen), Full List (VirusTotal)
Encrypted Files Extension .dalle
Rogue Process Name 5.exe (the process name may vary).
Ransom Demanding Message _readme.txt text file.
Ransom Amount $980/$490
Cyber Criminal Contact,, @datarestore (Telegram)
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.
Additional Information This malware is designed to show fake Windows Update window, modify Windows "hosts" file (to prevent users from accessing cyber security websites) and inject AZORult trojan into the system.
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 Dalle virus our malware researchers recommend scanning your computer with Spyhunter.
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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?

In order to prevent this situation users must be very cautious when browsing the Internet, as well as downloading, installing, and updating software. We highly recommend to think twice before opening any email attachment. Files/links received from suspicious email addresses should never be opened. Same goes for attachments that are irrelevant and do not concern you. Software should be downloaded only from official sources, using direct download links. Third party downloaders/installers should never be used, since they often include rogue applications. Same goes for software updates. Keeping installed applications and operating system up-to-date is also extremely important. To achieve this, however, use only implemented functions or tools provided by the official developer. Software piracy is considered a cyber crime. Moreover, the risk of infections is extremely high. For this reason, cracking installed applications should never be considered. Lastly, be sure to have a reputable anti-virus/anti-spyware suite installed and running, because it will help you detect and eliminate malware before it harms the system. If your computer is already infected with Dalle, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Dalle ransomware's text file ("_readme.txt"):


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:

Your personal ID:

Screenshot of Dalle's process ("5.exe") in Windows Task Manager:

Dalle process

Screenshot of files encrypted by Dalle (".dalle" extension):

Files encrypted by Dalle

Malware researcher Michael Gillespie has developed a decryption tool that might restore your data if it was encrypted using an "offline key". As we've already mentioned, each victim gets a unique decryption key and all of them are stored in remote servers controlled by cyber criminals. These are categorized as "online keys". However, there are cases when the infected machine has no Internet connection or the server is timing out/not responding. If that is the case, Dalle will use an "offline encryption key", which is hard-coded. Now it is worth mentioning that cyber criminals change offline keys every now and again. This is being done to prevent multiple encryptions with the same key. Meanwhile, Michael Gillespie continually gathers offline keys and updates the decrypter. However, the chances of successful decryption are still very low, since only a very small portion of "offline keys" has been gathered. You can download the decrypter by clicking this link (note that the download link remains the same, despite the fact that decrypter is being continually updated). Your files will be restored only if the list of gathered keys will include the one that was used to encrypt your data.

Screenshot of STOP/Djvu decrypter by Michael Gillespie:

STOP/Djvu ransomware decrypter by Michael Gillespie

As with most of ransomware from Djvu family, Dalle also displays a fake Windows update pop-up during the encryption:

Djvu ransomware family fake update

IMPORTANT NOTE! - Aside from encrypting data, ransomware-type infections from Djvu malware family also installs a trojan-type virus called AZORult, which is designed to steal various account credentials. Moreover, this malware family is designed to add a number of entries to the Windows hosts file. The entries contain URLs of various websites, most of which are related to malware removal. This is carried out with the intention of making users unable to access malware security websites and seek help. Our website ( is also on the list. Removing these entries, however, is simple - you can find detailed instructions in this article (note that, although the steps are shown in the Windows 10 environment, the process is virtually identical on all versions of the Microsoft Windows operating system).

Screenshot of websites added to Windows hosts file:

Tro Ransomware adding websites to Windows Hosts file

Dalle ransomware removal:

Instant automatic removal of Dalle 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 Dalle 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 Dalle 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 Dalle 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 Dalle 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 Dalle 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 Dalle, 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 Dalle 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 Dalle 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 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.

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Dalle virus QR code
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