"The Department is aware of the recent malicious cyber event involving the spoofing (impersonation) of a Department employee reported by U.S. cybersecurity firm FireEye. No Department networks were compromised by this malicious cyber attempt," the State Department spokesperson said late on Friday.
The two cybersecurity firms, cited in the reports, claimed that the hackers behind the cyberattacks had been linked to the Russian government.
The reports also suggested the hackers were from the APT29 group which has repeatedly been suspected of carrying out attacks of various western companies. The Russian Kaspersky Lab cybersecurity company also reportedly said that the impersonation operation had been carried out by APT29.
Russian presidential spokesman Dmitry Peskov has categorically denied claims that the Kremlin was involved in any cyberattacks and had links with cyberactors, calling these allegations defamation.