alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Generic Powershell Launching Hidden Window"; flow:established,to_client; flowbits:isset,ET.PS.Download; http.stat_code; content:"200"; file.data; content:"-windowstyle hidden"; nocase; fast_pattern; classtype:bad-unknown; sid:2032172; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_03_18, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_18;)