alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Formbook 0.3 Checkin"; flow:to_server,established; http.method; content:"POST"; http.user_agent; content:"Mozilla"; depth:7; http.request_body; content:"dat="; depth:4; nocase; fast_pattern; pcre:"/^[a-z0-9_\/+-]{1000}/Ri"; reference:md5,6886a2ebbde724f156a8f8dc17a6639c; classtype:command-and-control; sid:2024436; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_29, deployment Perimeter, malware_family Password_Stealer, confidence High, signature_severity Major, updated_at 2020_08_24;)