Hackers targeted voter registration systems in Illinois and Arizona, and the FBI alerted Arizona officials in June that Russians were behind the assault on the election system in that state.
The bureau described the threat as “credible” and significant, “an eight on a scale of one to 10,” Matt Roberts, a spokesman for Arizona Secretary of State Michele Reagan (R), said Monday. As a result, Reagan shut down the state’s voter registration system for nearly a week.
It turned out that the hackers had not compromised the state system or even any county system. They had, however, stolen the username and password of a single election official in Gila County.
Roberts said FBI investigators did not specify whether the hackers were criminals or employed by the Russian government. Bureau officials on Monday declined to comment, except to say that they routinely advise private industry of cyberthreats detected in investigations.