Security experts involved in investigation on the attack against the Bundestag suspect that the hack was part of a large-scale espionage campaign backed by the Kremlin. Der Spiegel speculates that the Russian Government is involved in the attack. The attackers, likely Russian state-sponsored hackers, used a. sophisticated strain of malware to violate the Bundestsag network and syphon sensitive data. The attack on the Parlakom network was discovered in early May. At the parliamentary IT network 20,000 Bundestags accounts are connected including German Chancellor Angela Merkel and other government officials.”]
Source: http://securityaffairs.co/wordpress/37535/cyber-crime/russians-hacked-bundestag.html