Remove Kasp Ransomware (Decrypt .kasp Files)

Kasp ransomware is a hazardous type of malware. Its main objective is to deny users access to their very own file by scrambling it using a complex cipher method. The decryption technique being applied by Kasp ransomware is cleverly using sophisticated RSA cryptography. Meaning, victims need a combination of private key and Kasp decryption tool. Attackers are taking advantage the requirements for this recovery method to extort money from their victims.

After locking the files, Kasp ransomware renames the data with a unique identifier. It appends the .kasp file extension to every infected data as a way of distinguishing mark. Some victims think that renaming back the file to its original format can make it accessible once again. Unfortunately, Kasp ransomware infection does not work that way. As mentioned, it decodes the core data and unique private key is assigned for each computer. Having said that, the decryption process that works for one victim may not be applicable to another party. Kasp designed the attack this way to generate profit by selling the decryption tool and individual private key.

Kasp Ransomware Infection

Most ransomware or also known as cypto-virus spreads over the internet using spam email campaign. The targets are random and observation reveals that those careless recipients of emails are the most vulnerable to the Kasp virus attack. Attackers are deploying the virus as a file attached to email and purporting as business correspondence, which merely discuss proposal, product inquiry, partnership, and so on. The message composition is requiring recipients to open the attached file asserting that it contains more detailed information.

As soon as email recipient access the attached file, Kasp ransomware initiates the attack and it begins by dropping several malicious files on the computer. Then, it scouts the local drive for target files and encrypts them with complex algorithm. On the final stage of the attack, Kasp ransomware generates a ransom note to instruct victims on the proper way to decrypting all the .kasp files. Here is an excerpt from the ransom note.

How to Remove Kasp Ransomware

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Kasp 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.

To remove Kasp automatically, scanning the computer with this efficient anti-malware tool is suggested. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering hazardous ransomware like Kasp.

Step 1 : Scan the Computer with Anti-Malware Tool

1. Download free anti-malware scanner called MalwareBytes Anti-Malware.

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 Kasp ransomware.

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

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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.

Step 2 : Double-check for Kasp's leftover with Microsoft's Malicious Software Removal Tool

1. Download the free scanner called Malicious Software Removal Tool.

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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 Kasp ransomware. Another option is to browse the location folder and double click on the file to run.

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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.

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5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Kasp 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.

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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.

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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 Kasp ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Stage 3 : Unlocking files with Kasp Decryption Tool

Emsisoft Decryptor for STOP Djvu will work only if affected files were encrypted using Offline Keys. Kasp 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 .kasp encrypted files.

1. As precautionary measures, we suggest to BACKUP all your .kasp 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 Kasp ransomware, click on Decrypt button to start the procedure. The interface will display status of the current decryption process.

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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 Kasp 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 Kasp 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 Kasp 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 Kasp ransomware infection.

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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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