Switzerland s CERT (Computer Emergency Readiness Team) spilled the beans on the attack against the Swiss defense contractor RUAG. The attack was an act of espionage where attackers went to great lengths to go undetected using a slow and patient strategy. Central to the attack was the use of Epic Turla, a highly sophisticated and ongoing cyberespionage campaign that targets government, militaries and embassies. Experts assert that RUAG computers were infected as early as 2014, making the attack slow and methodical.
Source: https://threatpost.com/unraveling-turla-apt-attack-against-swiss-defense-firm/118254/