Guccifer 2.0, the 'lone hacker' who stole Democratic National Committee emails during the 2016 presidential election, was a Russian intelligence agent.

The unnamed officer claimed to be a lone Romanian hacker, but was instead working for a military intelligence agency in Russia known as GRU, The Daily Beast reported.

US investigators were able to trace the person's identity when they failed to activate the VPN client before logging on.

Guccifer 2.0, the 'lone hacker' who stole Democratic National Committee emails during the 2016 presidential election, was a Russian intelligence agent

Guccifer 2.0 used platforms such as WordPress and Twitter to publicise a series of leaks in 2016, seemingly to damage Hillary Clinton's (pictured) campaign

A Moscow-based Internet Protocol address was left in the server logs of an American social media company, The Daily Beast report.

Guccifer 2.0 was uncovered as a particular GRU officer working out of the agency's headquarters on Grizodubovoy Street in Moscow.

The revelation is likely to deepen suspicions that Russia attempted to interfere in the US elections.

Guccifer 2.0 used platforms such as WordPress and Twitter to publicise a series of leaks in 2016, seemingly to damage Hillary Clinton's campaign.

These included emails between her campaign staff and Democratic National Committee employees, and the Hillary Clinton Foundation donor database.

The hacker also proclaimed that the DNC's stolen documents were in WikiLeaks' hands.

Guccifer 2.0 used platforms such as WordPress and Twitter to publicise a series of leaks in 2016, seemingly to damage Hillary Clinton's campaign

In February, special counsel Robert Mueller indicted 13 Russian nationals tied to the Internet Research Agency 'troll factory' in St Petersburg (above: Russian President Vladimir Putin)

In February, special counsel Robert Mueller indicted 13 Russian nationals tied to the Internet Research Agency 'troll factory' in St Petersburg.

He accused them of spreading propaganda to interfere in and influence the US elections.

It is now possible that Mueller will be able to charge Guccifer 2.0 if the individual has been uncovered.

Deputy Attorney General Rod Rosenstein and other top law enforcement officials held a press conference on March 23 to cover a 'major cyber law enforcement announcement.'