has used the WindowStyle parameter to conceal  windows. (Citation: FireEye APT32 May 2017) 
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 the WindowStyle parameter to conceal  windows. (Citation: FireEye APT32 May 2017)  ### Response: T1564.003.