Wikileaks released the second batch of CIAs Vault 7 dump, it contains five documents on Mac and iPhone hacks developed by the CIA. The CIA experts have found a way to infect Apple firmware to gain persistence, in this way the attackers were able to maintain the infection on Mac OS and iOS devices even if the operating system has been re-installed. One of the most interesting documents is related to the Sonic Screwdriver project, which is a mechanism for executing code on peripheral devices while a Mac laptop or desktop is booting”]
Source: https://securityaffairs.co/wordpress/57377/intelligence/cia-dark-matter-vault7.html