Since its first appearance in April this year, the operators of Jigsaw crypto virus have released other variants (Epic ransomware, Payms ransomware) besides the original version appending .fun, .kkk, .btc extensions. If you have been victimized by any of Jigsaws’s versions, you will be happy to know that a way to decrypt files encrypted by Jigsaw has been identified by researchers at security firm Check Point. Scroll down to see where to get the free Jigsaw decryption tool.
How Did Jigsaw Ransomware Function?
The original Jigsaw was mostly known for the deletion of encrypted files. The victim was asked to pay around 0.4 Bitcoins or 150 US dollars within one hour. If you they didn’t comply – every hour encrypted files would get deleted and after three days, all files would be erased.
The ransomware employed the AES encryption algorithm, and appended .fun, .btc and .kkk extensions. In case the user restarted their computer, at least 1,000 of the encrypted files would end up being deleted from disk drives.
Related: Ransomware Encryption Explained
Shortly after the crypto virus’s premiere on the malware scene, security researchers were able to create a working and free Jigsaw decrypter. However, the decryption tool stopped performing properly because the ransomware operators started updating their code regularly, making it more sophisticated. Jigsaw quickly became one of the most updated threats on the current malware market, with new versions emerging every week.
How Did Check Point’s Researchers Establish a Free Jigsaw Decryption Tool?
While investigating the latest Jigsaw Ransomware variant (SHA256: 61AA800584B170FFE9959ACD057CCAF784BF3088E1D3AAB39D07C0793F6C03DF) and its false claims to steal users’ credentials and Skype history, we came across the mechanism the ransomware uses to check whether payments have been made.
According to the researchers, a weakness has been identified not in the encryption process itself but in the way Jigsaw handles the ransom payment. Unlike most ransomware pieces, Jigsaw doesn’t use a Tor-based website but just prints a Bitcoin wallet address on the user’s PC via a specific ransom note. Once a payment is made, the user is prompted to press the “I made a payment, now give me back my files!” button. By pressing the button, the victim initiates a request from their PC to an online API that makes sure that a payment is successfully transferred to the given Bitcoin wallet.
What Check Point researchers did was create a tool that intercepts and imitates a positive API response. This is how Jigsaw “thinks” that a payment has been made while in reality it hasn’t, and as a result the decryption process is initiated. The process should end with the successful encryption of all compromised files, and auto-deleting the threat from the victimized machine.
Where Can Jigsaw Ransomware Victims Get the Decryption Tool?
The Jigsaw decryption tool can be downloaded from Check Point’s page.
Here is a short user manual on how to use it:
The working decryption method appears to have been originally disclosed by Peter Kleissner in a tweet from last week, Softpedia points out.
- Guide 1: How to Remove from Windows.
- Guide 2: Get rid of from Mac OS X.
- Guide 3: Remove from Google Chrome.
- Guide 4: Erase from Mozilla Firefox.
- Guide 5: Uninstall from Microsoft Edge.
- Guide 6: Remove from Safari.
- Guide 7: Eliminate from Internet Explorer.
How to Remove from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove
Step 2: Uninstall and related software from Windows
Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it.
Step 3: Clean any registries, created by on your computer.
The usually targeted registries of Windows machines are the following:
You can access them by opening the Windows registry editor and deleting any values, created by there. This can happen by following the steps underneath:
Get rid of from Mac OS X.
Step 1: Uninstall and remove related files and objects
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- Go to Finder.
- In the search bar type the name of the app that you want to remove.
- Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
- If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.
In case you cannot remove via Step 1 above:
In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:
You can repeat the same procedure with the following other Library directories:
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 2: Scan for and remove files from your Mac
When you are facing problems on your Mac as a result of unwanted scripts and programs such as , the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
Remove from Google Chrome.
Step 1: Start Google Chrome and open the drop menu
Step 2: Move the cursor over "Tools" and then from the extended menu choose "Extensions"
Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.
Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.
Erase from Mozilla Firefox.
Step 1: Start Mozilla Firefox. Open the menu window
Step 2: Select the "Add-ons" icon from the menu.
Step 3: Select the unwanted extension and click "Remove"
Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.
Uninstall from Microsoft Edge.
Step 1: Start Edge browser.
Step 2: Open the drop menu by clicking on the icon at the top right corner.
Step 3: From the drop menu select "Extensions".
Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.
Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.
Remove from Safari.
Step 1: Start the Safari app.
Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.
Step 3: From the menu, click on "Preferences".
Step 4: After that, select the 'Extensions' Tab.
Step 5: Click once on the extension you want to remove.
Step 6: Click 'Uninstall'.
A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the will be removed.
Eliminate from Internet Explorer.
Step 1: Start Internet Explorer.
Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'
Step 3: In the 'Manage Add-ons' window.
Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.
Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.