Who's Behind Massive DNC Email Hack?

Experts say all signs point to Russia.
2:24 | 07/26/16

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Transcript for Who's Behind Massive DNC Email Hack?
hacking scandal targeting the dnc. The FBI investigating accusat accusations that Vladimir Putin and the Russians were trying to sway the election. ABC's Brian Ross is here right now, has all the latest. Good morning, Brian. Good morning, robin. In what is being described as a rapidly expanding FBI investigation, U.S. Law enforcement offs tell ABC news the hack was almost certainly a Russian intelligence operation designed to affect the American election. Democratic party officials say the hackers' malware bug operated inside their computers for at least a year undetected. I'm very confident that the malware that we looked at were Russian actors. Reporter: Investigators dissected the computer's code and said they found clear evidence pointing to Russia including the use of a Russian alphabet keyboard. The time Zones that it was compiled in, the language that the keyboards were set to, this absolutely was not an amateur operation. ♪ Reporter: And the timing as democrats arrived in Philadelphia was clearly no accident either. One of the leaked e-mails reveals how supposedly neutral dnc staffers considered planting stories that Bernie sanders was an atheist. Another that his campaign was a mess. There's got to be an effort to undermine the democratic party and try to undermine Hillary Clinton. Reporter: Democrats see a Russia conspiracy by Vladimir Putin to help Donald Trump, something his campaign manager strongly denied to George on "This week." Are there any ties between Mr. Trump, you or your campaign and Putin and his regime? No, there are not. It's absurd and, you know, no basis to it. Reporter: But Putin has frequently praised trump as bright and talented and trump returns the favor. I think I'd get along very well with Vladimir Putin. I just think so. People say, what do you mean? I think I had a get along well with him. Reporter: In his business dealings trump and his children regularly sought investments in projects an the world from Russian billionaires and millionaires. Thank you to -- Reporter: Including one who served as the host of trump during the miss universe contest three years ago. Democratic party officials say there are many, many more e-mails including some possibly from the Clinton foundation that they know were stolen and have yet to be made and fear it will come during the course of the campaign.

This transcript has been automatically generated and may not be 100% accurate.

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