actors have mailed USB drives to potential victims containing malware that downloads and installs various backdoors including in some cases for ransomware operations.
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: actors have mailed USB drives to potential victims containing malware that downloads and installs various backdoors including in some cases for ransomware operations. ### Response: T1091.