The DNC was warned in the early hours of Tuesday morning by a cloud service provider and a security research firm that a fake login page was created to collect usernames and passwords that would allow access to the party's database, Quelle said.
The site was designed to look like the access page that Democratic Party representatives and campaigns across the country log into a service called VoteBuilder that hosts the database, the source said.
The source said that the DNC is investigating who might have been responsible for the attempted attack, but that it has no reason to believe that their voter file was called or changed.
The site was launched late Monday by Lookout, a San Francisco-based cybersecurity firm. The company does not work for the DNC, but warned the party of its findings, said Mike Murray, CNN's vice president of security, on Wednesday.
Murray said that a link to the page Democrats could have been sent via e-mail or through other online platforms in a spearphishing operation.
"It was very compelling," Murray said, adding that it would be difficult to distinguish them if one person saw the real logon page and the fake logon page side by side. "It would have been a very effective attack," he said.
Chief Security Officer of the DNC, Bob Lord, a former Yahoo! The Democrats reported Wednesday on attempted assassination at a meeting of the. in Chicago.
"These threats are serious and therefore it is crucial that we all work together, but we can not do it alone, we need the (Trump) administration to take more aggressive steps to protect our electoral systems, our democracy from these species from attacks, "Lord said in a statement to CNN.
CNN has responded to the FBI for comment.
Early Tuesday morning, Microsoft announced that parts of an operation connected with the Russian military intelligence information for the US Senate and conservative think tanks, which campaigned for a tougher policy against Russia, were thwarted last week.
This disclosure, which took place less than three months before the middle of 201