has used an RSS feed on Livejournal to update a list of encrypted C2 server names.  has also hidden  C2 server IP addresses within transactions on the Bitcoin and Namecoin blockchain.(Citation: ESET RTM Feb 2017)(Citation: CheckPoint Redaman October 2019)
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 an RSS feed on Livejournal to update a list of encrypted C2 server names.  has also hidden  C2 server IP addresses within transactions on the Bitcoin and Namecoin blockchain.(Citation: ESET RTM Feb 2017)(Citation: CheckPoint Redaman October 2019) ### Response: T1102.001.