By leveraging [Patch System Image](https://attack.mitre.org/techniques/T1601/001), adversaries can add custom code to the affected network devices that will implement onion routing between those nodes.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: By leveraging [Patch System Image](https://attack.mitre.org/techniques/T1601/001), adversaries can add custom code to the affected network devices that will implement onion routing between those nodes. ### Response: T1090.003.