A  macro has run a PowerShell command to decode file contents.  has also used  to decode base64-encoded files on victims.(Citation: FireEye APT34 Dec 2017)(Citation: OilRig New Delivery Oct 2017)(Citation: Unit 42 OopsIE! Feb 2018)
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: A  macro has run a PowerShell command to decode file contents.  has also used  to decode base64-encoded files on victims.(Citation: FireEye APT34 Dec 2017)(Citation: OilRig New Delivery Oct 2017)(Citation: Unit 42 OopsIE! Feb 2018) ### Response: T1140.