On Tuesday, June 27, 2017 the world became acquainted with the most destructive malware ever to be deployed. The disaster ushered in a new kind of state-sponsored cyber warfare, with Ukraine the target of a Kremlin-backed effort to frighten those doing business with Ukraine, with which Russia had been in a four-year war. As NotPetya infiltrated most every Ukrainian network, worry spread as it took hold of systems across Europe, the UK and farther.