On January 4, 2020, the Department of Homeland Security (DHS) issued a National Terrorism Advisory System (NTAS) bulletin describing current developments and general trends regarding the terrorist threat posed by nation-state cyber warfare programs. It is important to note that while the bulletin specifically states that the NTAS has no information indicating a specific, credible threat at this time, it acknowledges that ‘‘an attack in the homeland may come with little or no warning.’’

This article explains the recent rise in malicious cyber activity directed at U.S. industries and government agencies and offers nine key actions firms can take to deter, identify and respond to a cyberattacks.