has disrupted systems by encrypting files on targeted machines claiming to decrypt files if a ransom payment is made.  has used the ChaCha algorithm based on Salsa20 and an RSA algorithm to encrypt files.
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 disrupted systems by encrypting files on targeted machines claiming to decrypt files if a ransom payment is made.  has used the ChaCha algorithm based on Salsa20 and an RSA algorithm to encrypt files. ### Response: T1486.