“The computer network used by Democratic presidential nominee Hillary Clinton’s campaign was hacked as part of a broad cyber attack on Democratic political organizations, people familiar with the matter told Reuters.”
Malware was in the DNC systems for over a year, sitting undetected while relaying emails and all sorts of documents and data. They only found out when they were notified by outside sources that they had been hacked.
Authors: MARK HOSENBALL, JOSEPH MENN AND JOHN WALCOTT