uses a custom crypter leveraging Microsofts CryptoAPI to encrypt C2 traffic.(Citation: Fidelis TrickBot Oct 2016)Newer versions of  have been known to use `bcrypt` to encrypt and digitally sign responses to their C2 server. 
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: uses a custom crypter leveraging Microsofts CryptoAPI to encrypt C2 traffic.(Citation: Fidelis TrickBot Oct 2016)Newer versions of  have been known to use `bcrypt` to encrypt and digitally sign responses to their C2 server.  ### Response: T1573.001.