Feb. 28 (UPI) -- The German Interior Ministry confirmed on Wednesday that the country's defense and foreign ministry databases were hacked, with information stolen.
The statement followed news from the German Press Agency, citing anonymous sources, that a Russian hacking group called APT28 successfully retrieved data from the German federal data network.
The cyberattack was first noticed by security officials in December and may have been in place for a year. It is unclear how much government data was stolen.
"We can confirm that the Federal Office for Information Security and intelligence services are investigating a cybersecurity incident concerning the federal government's information technology and networks," an Interior Ministry spokesman said on Wednesday. He added that the targeted ministries have investigated the cyberattack and added additional measures to protect data.
The hackers invaded the government's "Informationsverbund Berlin-Bonn" network, a proprietary platform exclusively used by the German Chancellery -- the government's executive branch -- as well as Parliament, the Federal Audit Office and several security agencies in Berlin and Bonn, the German news outlet Deutsche Welle reported.
APT28, also known as Fancy Bear, has been linked to Russian intelligence and was identified as most likely to have conducted a 2015 cyberattack on the German Parliament, as well as on NATO and several Eastern European governments. The attack on Parliament prompted the German government to replace its entire information technology infrastructure.