On July 23 and 25, 2018, the U.S. Department of Homeland Security (DHS) held public briefings about an attempt by a state-sponsored Russian hacking group to target control systems for U.S. electrical grids and power plants. DHS’ webinar explained that the hackers obtained access to vendors providing computer services to electric utilities companies. This initial access enabled the hackers to gain entry to power company control systems through a complex series of security compromises lasting quite some time.