has used Base64 encoding within malware variants.  has also used ROT13 encoding AES encryption and compression with the zlib library for their Python-based backdoor.(Citation: iSight Sandworm Oct 2014)
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 Base64 encoding within malware variants.  has also used ROT13 encoding AES encryption and compression with the zlib library for their Python-based backdoor.(Citation: iSight Sandworm Oct 2014) ### Response: T1027.