They released a little more information -- they are apparently using some sort of remote desktop software for remote access: The intruder broke into the system

They released a little more information -- they are apparently using some sort of remote desktop software for remote access: The intruder broke into the system at least twice on Friday, taking control of a plant operator's computer through the same methods a supervisor or specialist might use. The hack didn't initially set off red flags, because remote access is sometimes used to monitor the system or trouble-shoot problems, Gualtieri said So it almost certainly doesn't have enough auditing to know who made a change.