Page:Report of the Select Committee on Intelligence United States Senate on Russian Active Measures Campaigns and Interference in the 2016 U.S. Election Volume 1.pdf/6

 * Evidence of scanning of state election systems first appeared in the summer prior to the 2016 election. In mid-July 2016, Illinois discovered anomalous network activity, specifically a large increase in outbound data, on a Illinois Board of Elections' voter registry website. Working with Illinois, the FBI commenced an investigation. The attack resulted in data exfiltration from the voter registration database.

(U) On August 18, 2016, FBI issued an unclassified FLASH to state technical-level experts on a set of suspect IP addresses identified from the attack on Illinois's voter registration databases. The FLASH product did not attribute the attack to Russia or any other particular actor.