uses SMTP/S and POP3/S for C2 communications by sending and receiving emails.
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: uses SMTP/S and POP3/S for C2 communications by sending and receiving emails. ### Response: T1071.003.