has used a fronted domain to obfuscate its hard-coded C2 server domain.
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: has used a fronted domain to obfuscate its hard-coded C2 server domain. ### Response: T1090.004.