In order to deter or prosecute for cyber attacks on industrial control systems it is necessary to assign attribution to the attacker and define the type of attack so that international law enforcement agencies or national Nail Scrub governments can decide on appropriate recourse.In this paper we identify the current state of the art of attribution in industrial control systems.We highlight the critical differences between attribution in enterprise networks and attribution in industrial Toy networks.In doing so we provide a roadmap for future research.