According to an unnamed official at the White House, hackers infiltrated an unclassified network. The attack did not appear to be aimed at destruction of data or hardware, or to take over other systems. The Washington Post speculated that Russian hackers may have coordinated the intrusion. The White House official said: Certainly a variety of actors find our networks to be attractive targets and seek access to sensitive information The intrusion was detected by defense systems and triggered a temporary system outages. The Obama Administration has confirmed the incident.”]
Source: http://securityaffairs.co/wordpress/29714/intelligence/hackers-white-house-network.html