Increasing posturing and geopolitical tension suggests that cyber warfare may become a key weapon in the behind the scenes battle for nations. Given the history of global cyber warfare and nation state involvement the following critical infrastructure functions are likely to become the target of both basic and elaborate disruption. Energy firms, capitalising on the fear of supply issues, water treatment, health and hospitals, finance institutions, government administration and banking and logistics. Firms and government institutions should check their protection from distributed denial of service and external perimeters. Practicing for recovery and making a plan for continued operations under duress are advised.