alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Powershell Downloader with Start-Process Inbound M1"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"new-object System.Net.WebClient"; nocase; fast_pattern; content:".DownloadFile("; distance:0; content:"Start-Process"; within:500; reference:md5,b510f48b9ac735a197093ad5fb99b0ee; classtype:bad-unknown; sid:2029339; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_29, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2020_08_19;)