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This is a interesting read indeed. Its not to scare anyone, but to educate them . . .
Researchers Create First Firmware Worm That Attacks Macs | WIRED
Researchers Create First Firmware Worm That Attacks Macs | WIRED
There have been examples of firmware worms in the past—but they spread between things like home office routers and also involved infecting the Linux operating system on the routers. Thunderstrike 2, however, is designed to spread by infecting what’s known as the option ROM on peripheral devices.
An attacker could first remotely compromise the boot flash firmware on a MacBook by delivering the attack code via a phishing email and malicious web site. That malware would then be on the lookout for any peripherals connected to the computer that contain option ROM, such as an Apple Thunderbolt Ethernet adapter, and infect the firmware on those. The worm would then spread to any other computer to which the adapter gets connected.