Guccifer 2.0 is believed by the U.S. intelligence community to be a cover identity for Russian intelligence. The intelligence community concluded that Moscow sought to interfere in last year's election specifically to help Trump win.
Stone told the Times exchanged a handful of messages with Guccifer 2.0 in the weeks following a hack of the DNC, which was revealed in late July.
In one message from Aug. 14, Stone said he was "delighted" that Guccifer 2.0's Twitter account had been reinstated after being suspended.
Trump adviser admits to contact with DNC hacker