Guccifer 2.0″ is a person or persona stating they were the hacker(s) that hacked into the Democratic National Committee (DNC) computer network and then leaked its documents to the media, the website WikiLeaks, and a conference event. Some of the documents they say they released appear to be forgeries cobbled together from public information and previous hacks, which they then salted with disinformation.

The U.S. Intelligence Community concluded that some of the genuine leaks that Guccifer 2.0 has said were part of a series of cyberattacks on the DNC were committed by two Russian intelligence groups. This conclusion is based on analyses conducted by various private sector cybersecurity individuals and firms, including CrowdStrike, Fidelis Cybersecurity, Fireeye’s Mandiant, SecureWorks, ThreatConnect, Trend Micro, and the security editor for Ars Technica.

The Russian government denies involvement in the theft, and “Guccifer 2.0” denied links to Russia. WikiLeaks founder Julian Assange said that multiple parties had access to DNC emails and that there was “no proof” that Russia was behind the attack. According to various cybersecurity firms and U.S. government officials, Guccifer 2.0 is a persona that was created by Russian intelligence services to cover for their interference in the 2016 U.S. presidential election.