The effect of Jenkins ransomware on computer files is so disastrous that user’s may not be able to access or open them anymore. The virus applies complex algorithm to lock the files and appends them with .jenkins extension. Therefore, an image.jpg file will transform into image.jpg.jenkins after it was encrypted by the said virus.
User’s carelessness when opening email attachment is seen as one ground why Jenkins ransomware was able to penetrate the system. One way that attackers are using to deploy this virus is through spam email messages sent to random recipients. Jenkins ransomware code is attached to the email, but masquerading as normal office file as document or spreadsheet. When user opens the file, Jenkins ransomware initiates the attack and proceeds with its file-locking exercise.
Other means to spread Jenkins ransomware online is through malicious advertising scheme and bundled apps that were uploaded to distrustful file-sharing networks.
Once all target files are encrypted and extensions were appended with .jenkins, the virus will generate an instructions called !READ_ME.txt file. It contains brief explanation and procedures to recover all Jenkins encrypted data. Here is an excerpt from the ransom note:
Something went wrong, please contact your System Administrator!
He can help you to understand what happened.
If he can’t help you, contact us via emai:
Hurry up! We have antidote for your files! Discount of 20% for clients who can contact us in the same day!
You can attached 2 files (text or picture) to check our honest intention, we will hear them and send back. File size not more than 1 Mb and it should be text of picture. Not database. Fill the following questionnaire and send it in body of your email.
We can help you to avoid same issues in the future. After heal, we will provide advice how to fix security issues on your network.
Bear in mind that paying the ransom demand does not guarantee restoration of the entire .jenkins data. There are reports that victims who communicate with attackers and made the ransom payment never heard back from attackers after transmitting the required funds. So, it is recommended to archive all encrypted files and wait for the official Jenkins decryption tool to be available soon.
How to Remove Jenkins Ransomware
Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Jenkins 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 MB3-Setup-[version].exe.
3. Carry out the installation with default setup process.
4. At the last stage of installation process, click the Finish button. The program should launch momentarily.
5. On Malwarebytes Anti-Malware console, select Scan from the menu to see available Scan Method.
6. Next, click on Threat Scan. This is the most complete scan method that will surely find any hidden malicious objects associated to Jenkins ransomware.
7. Finally, click on Start Scan begin checking the computer for malware and similar threats.
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 Jenkins’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 Jenkins 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 Jenkins 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 Jenkins ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.
Stage 3 : Unlocking files with Jenkins Decryption Tool
Tools that may decrypt files infected by Jenkins is not yet available at this time. We will update this section once the tool is on hand. In the meantime, please try the options below.
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 Jenkins 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 Jenkins 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 Jenkins 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 Jenkins 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.