Since this channel is independent of the operating system, it allows for any communication through it to be “ invisible to firewall and network monitoring applications running on the host device.”
https://www.neowin.net/news/hackers-utilize-intel-management-tools-to-bypass-windows-firewall
origin - http://www.pipiscrew.com/?p=8431 hackers-utilize-intel-management-tools-to-bypass-windows-firewall