How to remove Dever ransomware from the operating system?

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

Dever ransomware removal instructions

What is Dever?

Belonging to the Crisis/Dharma malware family, Dever is a ransomware-type malicious program. Devices infected with it have their data encrypted and a ransom is demanded from the victims, for the decryption software/tools. As Dever encrypts files it retitles them according to this pattern: unique ID, developers' email address (there are several mails the cyber criminals behind this infection use, therefore there is more than one variant in the altered filenames) and appends them with the ".Dever" extension. For example, a file like "1.jpg" would appear as something similar to "[1E857D00-2544].[].Dever" following encryption. Once this process is complete, a text file - "info.txt" and an HTML application - "info.hta" are created on the desktop. Updated variants of this ransomware use ".[].Dever" and ".[].Dever" extensions for encrypted files.

The text file informs victims that their data has been encrypted, if they want to restore it - they must contact the developers of Dever ransomware through the email addressed provided. The HTML application's pop-up window contains a more detailed ransom note. It clarifies that the email's subject/tile must be the user's ID (generated individually for each victim and located in both the note and in the filenames of affected files). If the cyber criminals do not respond within 24 hours - victims are to write to the alternate mail address. The price of the decryption tools/software will depend on how quickly users establish contact. The ransom will have to be paid in Bitcoin cryptocurrency (the message also lists web-links detailing how to and from where to obtain Bitcoins). As guarantee that recovery is possible, the criminals offer to decrypt up to 5 files for free. The total size of these files cannot exceed 4Mb (non-archived) and they cannot contain valuable information, such as databases, backups, large excel sheets and similar. Users are warned that renaming the compromised files and/or attempting to decrypt them with third party programs - can lead to permanent data loss. In most cases of ransomware infections - manual decryption (i.e. without the involvement of individuals responsible) is impossible. It might be a viable solution, if the malicious software in question has bugs (flaws) and/or is still in development. Regardless of which it is, it is expressly advised against communicating with and/or meeting the demands of cyber criminals - they are not to be trusted. Often, despite paying, victims do not receive the promised decryption software/tools. Thereby, their data remains encrypted and worthless. To prevent Dever from further encryptions - it must be eliminated from the system. Unfortunately, removal will not restore already encrypted data. It can be possible to recover the files from a backup, if one was created prior to the infection and stored in a different location.

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

Dever decrypt instructions (info.hta)

Happy New YearMZ434376 and Deniz_Kizi are a couple examples of other ransomware. Malicious programs within this classifications are designed to encrypt data and demand payment for its decryption. Crucial differences include the cryptographic algorithm they use (symmetric or asymmetric) and the ransom size. The latter vary between three and four digit sums. Usually, cyber criminals ask for cryptocurrencies (though other digital currencies are also probable), due to transactions of such being difficult/impossible to trace. To ensure data safety - backups should be kept in remote servers and/or unplugged storage devices. Ideally, multiple backup copies should be stored in several different locations.

How did ransomware infect my computer?

Malware in general (not just ransomware) primarily spreads via trojans, spam campaigns, software "cracking" (activation) tools, fake updaters and untrustworthy download channels. Trojans are malicious programs, capable of causing chain infections (i.e. they download/install additional malware). Large scale spam campaigns are used to send deceptive emails with virulent files attached to them (or containing links leading to such). These letters are typically presented as "official", "important", "urgent" and so on. The attachments come in a variety of formats, for example: archive and executable files, PDF and Microsoft Office documents, JavaScript, etc. When an infectious file is executed, run or otherwise opened - it initiates the infection process. Illegal activation ("cracking") tools can download/install malicious software, rather than activate licensed product. Illegitimate updaters cause infections by abusing the weaknesses of outdated programs and/or by installing malware instead of the updates. Untrustworthy download sources like: unofficial and free file-hosting sites, Peer-to-Peer sharing networks and other third party downloaders can offer malicious content for downloading (e.g. disguised as ordinary software and/or bundled with it).

Threat Summary:
Name Dever virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .Dever (files are also appended with a unique ID and developers' email address)
Ransom Demanding Message info.hta and info.txt
Cyber Criminal Contact and
Detection Names Avast (Win32:Malware-gen), BitDefender (Trojan.Ransom.Phobos.F), ESET-NOD32 (Win32/Filecoder.Phobos.C), Kaspersky (HEUR:Trojan.Win32.Generic), Full List Of Detections (VirusTotal)
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.

To eliminate Dever 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?

It is important not to open suspicious and/or irrelevant emails. All attachments (and web-links) found in dubious mail - must never be opened, as these files are the source of a potential infection. Users are advised to always use official and verified download channels. Programs should be activated and updated only using functions/tools, provided by legitimate developers. Illegal activation tools ("cracks") and third party updaters should not be used, due to high risk of malware installation. It is paramount to have a reputable anti-virus/anti-spyware suite installed and kept up-to-date. Further, this software should be used for regular system scans and removal of detected threats/issues. If your computer is already infected with Dever, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Dever ransomware's pop-up ("info.hta"):

All your files have been encrypted!
All your files have been encrypted due to a security problem with your PC. If you want to restore them, write us to the e-mail
Write this ID in the title of your message 1E857D00-2544
In case of no answer in 24 hours write us to this
You have to pay for decryption in Bitcoins. The price depends on how fast you write to us. After payment we will send you the tool that will decrypt all your files.
Free decryption as guarantee
Before paying you can send us up to 5 files for free decryption. The total size of files must be less than 4Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
How to obtain Bitcoins
The easiest way to buy bitcoins is LocalBitcoins site. You have to register, click 'Buy bitcoins', and select the seller by payment method and price.
Also you can find other places to buy Bitcoins and beginners guide here:
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Screenshot of Dever's text file ("info.txt"):

Dever ransomware text file (info.txt)

Text presented in this file:

!!!All of your files are encrypted!!!
To decrypt them send e-mail to this address:
If we don't answer in 24h., send e-mail to this address: 

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

Files encrypted by Dever ransomware (.Dever extension)

Dever ransomware removal:

Instant automatic removal of Dever 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 Dever 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 Dever 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 Dever 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 Dever 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 Dever 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 Dever, 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 Dever 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, and 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 Dever 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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Removal Instructions in other languages
Malware activity

Global malware activity level today:

Medium threat activity

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

QR Code
Dever 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 Dever virus on your mobile device.
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Platform: Windows

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