Harpy backdoor malware can use DNS as a backup channel for C2 if HTTP fails.
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: Harpy backdoor malware can use DNS as a backup channel for C2 if HTTP fails. ### Response: T1008.