encodes the payload of system information sent to the command and control servers using a one byte 0xFF XOR key.  also uses a 31-byte long static byte string to XOR data sent to command and control servers. The servers use a different static key to encrypt replies to the implant. 
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: encodes the payload of system information sent to the command and control servers using a one byte 0xFF XOR key.  also uses a 31-byte long static byte string to XOR data sent to command and control servers. The servers use a different static key to encrypt replies to the implant.  ### Response: T1573.001.