Not a very comforting response..
From The Register
Read the complete article here: which OS can be hacked by the CIA or cybercriminals…
https://www.theregister.co....
Quote
"OS X: Users of Apple's OS X shouldn't look too smug, however. The CIA has tools for you too – pages of them.
A lot of hacking tools cover OS X El Capitan, but presumably these have been updated to subvert new versions of the operating system. That said, it does seem through reading these files that Apple poses a significantly more difficult challenge for the CIA than Redmond's code.
Analysts note that the operating system can be resilient to applications that try to slip malware onto a Mac. But it's still possible to whitelist spying software; subvert NetInstall images, creating zombie programs; and surreptitiously get at the kernel.
One interesting project the files touch on is dubbed QuarkMatter. This is a technique for hiding spying software persistently on an OS X system by using an EFI driver stored on the EFI system partition. Another, dubbed SnowyOwl, uses a pthread in an OpenSSH client to potentially pull off remote monitoring of a target system.
The documents also show a project called HarpyEagle that analyzed Apple's Airport Extreme firmware for private keys, and also Time Capsule systems."