alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ServHelper CnC Inital Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"key="; depth:4; nocase; content:"&sysid="; nocase; distance:0; fast_pattern; content:"&resp="; nocase; distance:0; content:"&misc="; distance:0; classtype:command-and-control; sid:2026772; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_01_04, deployment Perimeter, confidence High, signature_severity Major, tag ServHelper, updated_at 2020_08_28;)