The detection rule titled "Detect Software Download To Network Device" aims to identify unauthorized software downloads occurring on network devices, specifically through protocols such as TFTP, FTP, or SSH/SCP. The rule functions by analyzing network traffic events that target specific ports associated with these protocols: port 69 for TFTP, port 21 for FTP, and port 22 for SSH/SCP. The search conditions focus on traffic originating from devices classified as network devices, routers, or switches while also ensuring that the destination is not a common software repository. This detection is crucial as adversaries may exploit netbooting techniques to load unauthorized operating systems onto network devices, thereby compromising the integrity of the network. If such an unauthorized action is confirmed, it poses a significant risk, potentially affecting network control, facilitating further attacks, data exfiltration, or establishing persistent access within the network. Additionally, implementers should note that legitimate software downloads may also trigger alerts.