A Petya decryption key has been made public by Janus Cybercrime Solutions as per this Twitter post. We have not verified this in-house, so you are on your own if you are wanting to access that file, but I am trying to get verification. All this came via betanews. Thanks cagey!
Janus...
It is looking that Petya might have been a wolf in wolf's clothing which brings an interesting new wrinkle to the surface in all of this ransomware nonsense that we are dealing with. Petya, NotPetya, NewPetya, whatever you may want to call it, looks as though its primary goal may have not to...
Update 2: While not confirmed, it looks as if Petya / Petwrap is a fake MS certification to run PSEXEC with stolen/blackmarket SMB logins.
Update: Our in-house security expert is telling me that Petya / Petwrap looks to be a worm with multiple propagation functionality. "The worst I have...