Dcrtr Ransomware

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

Dcrtr ransomware removal instructions

What is Dcrtr?

First discovered by Michael Gillespie, Dcrtr is a ransomware-type virus that stealthily infiltrates systems and encrypts stored data. During the process, Dcrtr adds the ".[decryptor@cock.li].dcrtr" extension to the name of each compromised file. For instance, "sample.jpg" is renamed to "sample.jpg.[decryptor@cock.li].dcrtr". From this point, using files becomes impossible. After successfully encrypting files, Dcrtr creates a text file ("ReadMe_Decryptor.txt"), placing a copy in every existing folder. Updated variants of this ransomware use ".COPAN" and ".[cryptmanager@protonmail.com].parrot" extensions for encrypted files.

The new text file contains a message informing victims of the encryption and instructing them what to do next. The instructions are simple: to decrypt files, victims must contact cyber criminals via an email address provided. Criminals then provide further instructions, however, to receive them, victims must pay a ransom. It is currently unknown whether Dcrtr uses symmetric or asymmetric cryptography, however, no matter which cryptography is used, decryption requires a key generated uniquely for each victim. Criminals store these keys on a remote server, allowing them to make ransom demands for their release. The cost is currently unknown and supposedly depends on how quickly victims make contact. Cyber criminals typically demand $500-1500 in Bitcoins (or other cryptocurrency). Users are also allowed to attach five selected files (up to 10MB in total). Criminals then supposedly decrypt and return the files, supposedly as a 'guarantee' that decryption is possible. In fact, these cyber criminals can never be trusted. Research shows that these people often ignore victims, once payments are submitted. Therefore, paying typically gives no positive result and users are scammed. As well as losing their money, victims will support cyber criminals' malicious businesses. Therefore, we strongly advise you to ignore all requests to contact these people or pay any ransoms. There are currently no tools capable of restoring files encrypted by Dcrtr and you can only restore everything from a backup.

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

Dcrtr decrypt instructions

There are dozens of ransomware-type viruses sharing similarities with Dcrtr. For example, Twist, BlackRuby, Payerranso, MindLost, and many others. Although these viruses are developed by different cyber criminals, they have identical behavior - they encrypt data and make ransom demands. In most cases, viruses such as Dcrtr have just two major differences: 1) type of used cryptography, and; 2) cost of decryption. Research shows that, unfortunately, most of these viruses employ algorithms that generate unique decryption keys. Therefore, restoring files manually without involvement of developers (contacting these people is not recommended) is impossible, unless the malware is not fully developed or has certain bugs/flaws (e.g., the key is stored locally, hard-coded, or similar). Ransomware presents a strong case for maintaining regular data backups, however, backup files must stored on a remote server or unplugged external storage to prevent the ransomware encrypting them as well.

How did ransomware infect my computer?

To proliferate ransomware, criminals typically employ spam emails (malicious attachments), third party software download sources (P2P [peer-to-peer] networks, free file hosting websites, freeware download websites, etc.), fake update tools, and trojans. Malicious attachments are usually delivered in the format of JavaScript files or MS Office documents that, once opened, download and install malware. Unofficial software download sources present malware as legitimate software, thereby tricking users into downloading and installing. Fake updaters infect the system by exploiting outdated software bugs/flaws or downloading malware rather than updates. Trojans are the simplest ones - they open "backdoors" for other high-risk malware to infiltrate the system.

Threat Summary:
Name Dcrtr virus
Threat Type Ransomware, Crypto Virus, Files locker
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 Dcrtr 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?

The main reasons for computer infections are poor knowledge and careless behavior, and the key to safety is caution. Never open files received from suspicious email addresses. These emails should be deleted without reading. We also strongly recommend that you download your applications from official sources only using direct download links. Third party downloaders/installers are likely to include rogue software. Therefore, keep installed applications updated and use a legitimate anti-virus/anti-spyware suite. Criminals proliferate malware via fake updaters, and therefore you should update applications using implemented functionality or at least tools provided by the official developer.

Text presented in Dcrtr ransomware text file ("ReadMe_Decryptor.txt"):

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 decryptor@cock.li
In case of no answer in 24 hours write us to theese e-mails: masterdecrypt@openmailbox.org

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 decryption 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 10Mb (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:

Screenshot of files encrypted by Dcrtr (".[decryptor@cock.li].dcrtr" extension):

Files encrypted by Dcrtr

Dcrtr ransomware removal:

Instant automatic removal of Dcrtr 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 Dcrtr 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 Dcrtr 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 Dcrtr 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 Dcrtr 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 Dcrtr 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 Dcrtr, 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 Dcrtr 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 Dcrtr 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
Dcrtr virus QR code
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