Several recent cases involving the NotPetya malware highlight â€œsilent cyber and the Hostile Acts exclusion in insurance policies. Silent cyber a term used to describe losses related to cyber incidents that are covered by policies not written specifically for cyber-related losses. In the case of NotPetya, some policyholders are looking to their commercial property insurance policies for coverage. The original of and destruction caused by NotPetya also implicates the rarely litigated Hostile Acts exclusion, previously referred to as the War Risks exclusion. This program will discuss silent cyber, how it can be triggered, what insureds should expect when making a cyber-related claim on non-cyber policy, and how the Hostile Acts exclusion can play out in terms of burden and proof.