Is it a requirement to infect the air-gapped pc with malware at first to get all needed functions for a communication path between air gapped pc and attacker pc?
For example: Stuxnet, first was the infected USB-stick on air-gapped pc then the communication over side-channel. Or are there any side channel attacks that don't require malware on air-gapped pc?
When malware is a requirement to communicate (see upper question), does the malware do write functions? I think so because it doesn't make sense "when malware is required" (see upper question) but don't need to work/write/execute any code, is that right?
With air-gapped pc i mean: A brandnew tower computer or laptop/netbook etc. (very simple) Just FYI all communications devices (bluetooth, wlan etc.) are physical destroyed/removed