Derp Ransomware Removal (.derp Decryption)

Derp is a ransomware virus that online extortionist are using to keep majority of user’s files as their hostage. The virus renders common data inaccessible by encrypting them with sophisticated algorithm that is excessively difficult to decode. For this reason, attackers are taking advantage of this ransom virus to rip off money from innocent computer users.

Realistically, users are partly to be blame for falling victims to Derp ransomware. If not only for their careless actions while online, the virus should have not found a way to penetrate the computer. Typically, Derp or any other ransomware spreads via deceitful tactics like spam emails, questionable freeware, or malicious advertisements. Simply clicking or opening the file from these sources will result to execution of Derp ransom virus. Right at that moment, it will attempt to dominate the infected computer by dropping several executable files and run them as Windows processes.

At the last stage of the attack, Derp ransomware encrypts target files with complex pattern, which makes it inoperable. Similarly, the virus appends the file with .derp extension to remove its association with known programs.


A pair of decryption tool and private key is necessary to restore encrypted files but this is under the possession of attacker, which they are selling for a very expensive price. Victims are required to transmit $980 to attacker’s designated payment processor in order to receive the private key and decryption tool. However, malware researchers warn that opting on this resolution gives favor to attackers in continuing their online fraudulent acts. As long as they benefit from these wrongdoings, the operation will persists and more computer users may suffer from the same attack.

How to Remove Derp Ransomware

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Derp virus. Aside from our suggested tool, you may also run your own security program.

Though affected files may be impossible to decrypt due to complexity of the encryption, you can still try recovery method like alternative tool, Shadow Explorer or Previous Version as described below.

Stage 1: Scan the Computer with Anti-Malware Tool

1. Download free anti-malware scanner called MalwareBytes Anti-Malware.
Malwarebytes Anti-Malware Download Link (this will open a new window)

2. After downloading, install the program. It may run automatically or you have to double-click on the downloaded file MBSetup.exe.

3. Carry out the installation with default setup process.

4. After the installation process, click the Get Started button to launch the program.

5. Continue with the prompts until the main program opens.

6. On the main console, click on Scan to run most complete detection method to find hidden objects associated to Derp ransomware.

7. Scanning may take a while. Please wait until the anti-malware tool is done with the checking.


8. Once the scan has completed, the tool will display the list of detected threats. Remove all identified malicious items and restart the computer if necessary.

Stage 2: Double-check for Derp’s leftover with Microsoft’s Malicious Software Removal Tool

1. Download the free scanner called Malicious Software Removal Tool.
Malicious Software Removal Tool Download Link (this will open a new window)


2. The tool automatically checks the operating system and suggest appropriate download version. Click on Download button to begin. Save the file to a convenient location, preferably on Desktop.

3. After downloading the file, Windows will prompt that download has completed. Click Run to start scanning for Derp ransomware. Another option is to browse the location folder and double click on the file to run.


4. The tool will display Welcome screen, click Next. Please note the message “This tool is not a replacement for an antivirus product.” You must understand that this program is made specifically to find and remove malware, viruses, Trojans, and other harmful elements on the computer. It was not designed to protect the computer.


5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Derp ransom virus entities and other harmful files left on the computer will be found and removed. For advanced computer user, you can opt for Customized Scan, if there are other drives or folders you wanted to include in this scan.


6. Full scan may take a while, please wait for Malicious Software Removal Tool to complete the tasks. However, you may cancel the scan anytime by clicking on the Cancel button.


7. After scanning, the tool will reveal all identified threats. There may be other threats that our first scan fails to detect. Please remove/delete all detected items.

8. When removal procedure is complete, you may now close Malicious Software Removal Tool. We hope that Derp ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Stage 3 : Unlocking files with Derp Decryption Tool

Emsisoft Decryptor for STOP Djvu will work only if affected files were encrypted using Offline Keys. Derp ransomware uses the alternate Offline Keys during encryption if there is a problem encountered while communicating to a remote command-and-control server. Follow the guide to start recovering .derp encrypted files.

1. As precautionary measures, we suggest to BACKUP all your .derp encrypted files first on a separate media (USB Drive, Flash Drive, DVD Discs, etc…).

2. Download Emsisoft Decryptor for STOP Djvu from this archive page.

3. Right-click on decrypt_STOPDjvu.exe and click “Run as Administrator“. Windows may prompt “Do you want to allow this app…” just click Yes to continue.

4. By default, the tool will pre-populate the locations where encrypted files were identified. To include other directories, simply click Add Folder button.

5. To start recovering files infected by Derp ransomware, click on Decrypt button to start the procedure. The interface will display status of the current decryption process.


We will update this section once the full decryption tool is on hand. In the meantime, please try other options below if the above procedure is not not effective.

Option 1: Windows Previous Version Tool

Windows Vista and Windows 7 have a feature called Previous Versions. However, this tool is only usable if restore point was made prior to Derp ransomware infection. To use this tool and recover files affected by the virus, please follow these steps:

1. Open My Computer or Windows Explorer.

2. Right-click on the affected files or folders. From the drop-down list, please click on Restore previous versions.

3. New window will open display all backup copy of files and folders you wanted to recover. Choose the appropriate file and click on Open, Copy, or Restore. Restoring selected files overwrites the current encrypted files on the computer.

Option 2: Use ShadowExplorer to restore files encrypted by Derp Ransomware

Just like Previous Version tool, ShadowExplorer is taking advantage of shadow copy created by Windows. This tool allows you to retrieve older version of files before it was encrypted by Derp ransomware.

1. Download ShadowExplorer from the official web site.

2. Install the program with the default settings.

3. The program should run automatically after installation. If not, double-click on ShadowExplorer icon.

4. You can see the drop-down list on top of the console. Please select proper drive and the most recent point-in-time shadow copies of files you wish to restore prior to Derp ransomware infection.


5. Right-click on the Drive, Folder, or File you wish to restore and click Export…

6. Lastly, ShadowExplorer will prompt for location where you want to save the copy of recovered files.

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6 thoughts on “Derp Ransomware Removal (.derp Decryption)”


    Thank you for your explanation. Am currently suffering from this attached as my files has been locked with the derp. extension.
    I will be grateful if I am updated as a decryption tool is available.

  2. When you get the .derp decryption toll to decrypt my files please email me.
    Vito_v2 @

  3. Hi
    How I can opening my files it’s encrypted by virus derp
    I tried opening by the tools but it’s unlocked
    Please help me
    W2831980 @

  4. This .derp virus hits me a lot. Getting depressed. Please help me.

    1042anil @

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