Adversaries can modify an existing service to persist malware on a system by using system utilities or by using custom tools to interact with the Windows API.
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: Adversaries can modify an existing service to persist malware on a system by using system utilities or by using custom tools to interact with the Windows API. ### Response: T1031.