has used an XOR-based algorithm to encrypt Tor clients dropped to disk.(Citation: ProofPoint Ursnif Aug 2016) droppers have also been delivered as password-protected zip files that execute base64 encoded  commands.
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 XOR-based algorithm to encrypt Tor clients dropped to disk.(Citation: ProofPoint Ursnif Aug 2016) droppers have also been delivered as password-protected zip files that execute base64 encoded  commands. ### Response: T1027.