The FBI initially reached out to the DNC via telephone to ask if the DNC is aware, and if so, what the DNC was doing about it. The DNC was left to figure out, largely on his own, how to respond and even whether the man who had called in to the switchboard was really an FBI agent. The FBI told him to look for a specific type of malware dubbed Dukes by the U.S. intelligence community and in cybersecurity circles.”]
Source: https://grahamcluley.com/shocking-failure-fbi-dnc-hack/