@janus
Original Petya malware author and otherwise ransomware-activist Janus may have released the private decryption key to the initial Petya, but that doesn’t appear to have prevented ongoing development of this ransomware. Despite Petya’s unique qualities, including implementation of an overwrite of the Master Boot Record and initial deployment via a Ukranian accounting package, Petya has been heavily criticized. However, recent versions have been credited with features that cause mayhem all the way to the boardroom, including Kaspersky users getting a free pass and material impact on the operations and financial performance of victim companies.