Before being appended to image files  commands are encrypted with a key composed of both a hard-coded value and a string contained on that day's tweet. To decrypt the commands an investigator would need access to the intended malware sample the day's tweet and the image file containing the command.
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: Before being appended to image files  commands are encrypted with a key composed of both a hard-coded value and a string contained on that day's tweet. To decrypt the commands an investigator would need access to the intended malware sample the day's tweet and the image file containing the command. ### Response: T1573.001.