Documents leaked online after the Hacking Team hack revealed that the company used a UEFI BIOS rootkit to gain persistence for its spyware software. The company developed the popular Remote Control System (RCS) spyware, also known as Galileo. RCS has a modular structure that allows it to compromise several targets by loading the necessary zero-day exploits. This means that even if the user formats the hard disk, reinstalls the OS, and even buys a new hard. disk, the agents are implanted after Microsoft Windows is up and running.”]
Source: http://securityaffairs.co/wordpress/38585/cyber-crime/uefi-bios-rootkit-ht.html