Before exfiltration 's backdoor has used hidden files to store logs and outputs from backdoor commands.
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: Before exfiltration 's backdoor has used hidden files to store logs and outputs from backdoor commands. ### Response: T1564.001.