How to eliminate Dalle ransomware from the system

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

Dalle ransomware removal instructions

What is Dalle?

First discovered by malware researcher, Michael Gillespie, Dalle is a high-risk ransomware infection that belongs to the Djvu ransomware family. Dalle is designed to stealthily infiltrate computers and encrypt most stored files. During encryption, Dalle appends filenames with the ".dalle" extension (hence its name). Encrypted data immediately becomes unusable. Additionally, Dalle creates a text file called "_readme.txt" and stores a copy in every existing folder.

As with other ransomware from the Djvu family, Dalle's text file delivers a ransom-demand message stating that data is encrypted and that victims must purchase a decryption tool/key to restore it. Unfortunately, claims that a unique decryption key is necessary to restore data are accurate. The exact algorithm used by Dalle ransomware is currently unconfirmed, however, each victim receives a unique decryption key. All keys are stored on a remote server controlled by Dalle's developers, and thus victims must pay ransoms to receive their keys. The cost of decryption is $980 and victims are encouraged to contact the criminals via email or telegram to receive payment/decryption instructions. The message also states that victims who make contact within 72 hours will receive a 50% discount (the cost will drop to $490). In addition, victims are permitted to attach one selected file. which cannot contain any "valuable information". The file is then restored and returned - criminals do this to 'prove' that decryption is possible and to gain the victim's trust. Regardless of the cost, do not pay. Ransomware developers usually ignore victims once payments are submitted. Paying usually gives no positive result and users are merely scammed. Therefore, ignore all requests to contact these people and certainly do not submit any payments. As mentioned above, each victim receives a unique decryption key, however, if the infected machine has no Internet connection or the server is not responding, Dalle encrypts data using a so-called "offline key". Therefore, 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 one has been created.

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

Dalle decrypt instructions

The internet is full of ransomware infections that share similarities with Dalle including Amigo X-3, Non, and LooCipher - these are just some examples from many. Most ransomware compromises data (typically, by encryption) and makes ransom demands (developers offer paid recovery of files). Type of cryptography used and cost of decryption are typically the only differences. In most cases, data is encrypted using AES, RSA, and other similar algorithms that generate unique decryption keys. Therefore, it is impossible to restore data without the developers' involvement (unless the virus is not fully developed or has bugs/flaws). Ransomware infections present a strong case for maintaining regular backups, however, store them on a remote server or unplugged storage device, since locally stored backups are compromised together with regular data. Additionally, have multiple backup copies stored in different locations, since there is always the chance that storage devices and servers can be damaged.

How did ransomware infect my computer?

Ransomware infections are typically proliferated using trojans, fake software updaters and 'cracks', unofficial software download sources, and spam email campaigns. Trojans are malicious applications that stealthily infiltrate computers by downloading/installing additional malware. Fake updaters infect computers by exploiting outdated software bugs/flaws or simply downloading and installing malware rather than the updates. The same applies to fake cracking tools, which inject malware rather than providing access to paid features. Third party download sources such as freeware download websites, free file hosting sites, Peer-to-Peer (P2P) networks, and similar tools are used to proliferate malware by presenting it as legitimate software. In this way, users are tricked into manual download and installation of malware. Spam email campaigns are also used in a similar manner. Cyber criminals send hundreds of thousands of emails containing malicious attachments and deceptive messages encouraging recipients to open them. Attachments are often presented as important documents (invoices, receipts, bills, etc.) - in this way, criminals attempt to give the impression of legitimacy and increase the chance of tricking recipients. In summary, the main reasons for computer infections are poor knowledge of these threats and careless 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 gorentos@bitmessage.ch, ferast@firemail.cc, @datarestore (Telegram)
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.
Additional Information This malware is designed to show fake a Windows Update window, modify the 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.
Removal

To eliminate Dalle 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?

To prevent this situation, be very cautious when browsing the internet, and downloading, installing, and updating software. We strongly recommend that you think twice before opening any email attachment. Files/links received from suspicious email addresses should never be opened. The same applies to attachments that are irrelevant or do not concern you. Software should be downloaded from official sources only, using direct download links. Third party downloaders/installers should never be used, since they often include rogue applications. The same applies to software updates. Keeping installed applications and operating systems up-to-date is extremely important, however, use only implemented functions or tools provided by the official developer. Software piracy is a cyber crime and the risk of infections is extremely high. Therefore, cracking installed applications should never be considered. Have a reputable anti-virus/anti-spyware suite installed and running, since this will 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 text file ("_readme.txt"):

ATTENTION!

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:
hxxps://we.tl/t-i9Z5mq0D52
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:
gorentos@bitmessage.ch

Reserve e-mail address to contact us:
ferast@firemail.cc

Our Telegram account:
@datarestore

Your personal ID:
-

Screenshot of Dalle 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 mentioned, each victim gets a unique decryption key, all of which are stored on remote servers controlled by cyber criminals. These are categorized as "online keys", however, there are cases whereby the infected machine has no Internet connection or the server is timing out/not responding. If this is the case, Dalle will use an "offline encryption key", which is hard-coded. Cyber criminals change offline keys periodically to prevent multiple encryptions with the same key. 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 proportion of "offline keys" have so far been gathered. You can download the decrypter by clicking this link (note that the download link remains identical, even though the decrypter is being continually updated). Your files will be restored only if the list of gathered keys includes 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 ransomware from the Djvu family, Dalle also displays a fake Windows update pop-up during the encryption:

Djvu ransomware family fake update

IMPORTANT NOTE! - As well as encrypting data, ransomware-type infections from the Djvu malware family also install 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 done to prevent users from accessing malware security websites and seeking help. Our website (PCrisk.com) 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 a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the 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 is more information on how to get this update and add an 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 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
Medium

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

QR Code
Dalle virus QR code
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