communicates to a C2 server over port 443 using modified RC4 and XOR-encrypted chunks. 
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: communicates to a C2 server over port 443 using modified RC4 and XOR-encrypted chunks.  ### Response: T1573.001.