Adrien Guinet, a French security researcher Adrien Guinet has created a software tool called “WannaKey” that “may” decrypt the files which were encrypted by WannaCry Ransomware. So if you are lucky and have not rebooted the infected computer you “MAY” be able to unencrypt your files without having to pay the Ransom fee.
When WannaCry encrypts your files, it creates a Private Key which is used to create the decrypt key. Then the Private key is erased. On older Windows systems the erase does not remove the data from memory. So if you are lucky and you have “not” rebooted the PC then there is a chance that WannaKey could recover the Private key, because it is still held in the system memory.
The key point to remember is that the above process “MAY’ work. The Computer which was encrypted by WannaCry Ransomware, must “NOT” have been rebooted. Any files to download would be done using a different computer and then run on the encrypted PC via a USB flash Drive. The WannaCry code did issue the command to erase the Private Key but the bug in older Windows Operating Systems is that Private Key has not been erased from the computer’s main memory. With a bit of luck, you may be able to decrypt your WannaCry encrypted PC. Note there is no guarantee that this will work. If you are unsure how to go about this, then get a computer professional to help you.
Click on this Link to visit the Adrien Guinet GitHub page for Wannakey.
Click on thsLink to visit the Benjamin Delpy GitHubn page for Wanakiwi.
Click on this Link to visit the Comae Blog post by Matt Suiche titled “WannaCry — Decrypting files with WanaKiwi + Demos”. Matt goes thru the whole process along with screen shots.
Video is courtesy of the Vishnu Ava YouTube channel
Click on this link to view other CyberSecurity related posts found on Uniquely Toronto.
Posted by Vincent Banial
Disclaimer: Everything in the post above is subject to change without notice. There could be unintentional errors. Please confirm all info via the linked to websites and web pages. Best Practice is to also always create daily backups. If you try to decrypt a WannaCry encrypted personal computer or server, you do so at your own risk. There is no guarantee that the above info will be successful in decrypting the files.