WannaCry Ransomware Decryption Keys

The affected computer has not been rebooted after being infected.

The associated memory has not been allocated and erased by some other process.

WanaKiwi: WannaCry Ransomware Decryption Tool

If your PC has been infected by WannaCry – the ransomware that wreaked havoc across the world last Friday – you might be lucky to get your locked files back without paying the ransom of $300 to the cyber criminals.Adrien Guinet, a French security researcher from Quarkslab, has discovered a way to retrieve the secret encryption keys used by the WannaCry ransomware for free, which works on Windows XP, Windows 7, Windows Vista, Windows Server 2003 and 2008 operating systems.The WannaCry's encryption scheme works by generating a pair of keys on the victim's computer that rely on prime numbers, a "public" key and a "private" key for encrypting and decrypting the system's files respectively.To prevent the victim from accessing the private key and decrypting locked files himself, WannaCry erases the key from the system, leaving no choice for the victims to retrieve the decryption key except paying the ransom to the attacker.WannaCrysays Guinet.Based on this finding, Guinet released a WannaCry ransomware decryption tool, named, that basically tries to retrieve the two prime numbers, used in the formula to generate encryption keys from memory, and works on Windows XP only.Below I have also mentioned another tool, dubbed, that works for Windows XP to Windows 7." says GuinetSo, that means, this method will work only if:" Guinet says.While WannaKey only pulls prime numbers from the memory of the affected computer, the tool can only be used by those who can use those prime numbers to generate the decryption key manually to decrypt their WannaCry-infected PC's files.Good news is that another security researcher, Benjamin Delpy, developed an easy-to-use tool called "," based on Guinet's finding, which simplifies the whole process of the WannaCry-infected file decryption.All victims have to do is download WanaKiwi tool from Github and run it on their affected Windows computer using the command line (cmd).WanaKiwi works on Windows XP, Windows 7, Windows Vista, Windows Server 2003 and 2008, confirmed Matt Suiche from security firm Comae Technologies, who has also provided some demonstrations showing how to use WanaKiwi to decrypt your files.Although the tool won't work for every user due to its dependencies, still it gives some hope to WannaCry's victims of getting their locked files back for free even from Windows XP, the aging, largely unsupported version of Microsoft's operating system.