An Ohio resident used a malware called Fruit fly to hack into people computers in order to gain access to the victims microphone/ audio. He used the access for nefarious purposes such as child pornography. "Basically, he scanned the Internet for Macs with exposed ports that he could exploit and then attempted to connect to these systems using weak, known credentials. Once a system was compromised, he then attempted to persistently install the malware."

https://www.securityweek.com/weak-passwords-abused-fruitfly-mac-malware-distribution