alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Krypton Stealer CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.user_agent; content:"Client"; depth:6; endswith; http.request_body; content:"id="; depth:3; content:"&message="; distance:0; fast_pattern; reference:md5,825afad02d07063689b7b59e8cf46809; classtype:command-and-control; sid:2027313; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_05_03, deployment Perimeter, malware_family Krypton, performance_impact Low, confidence High, signature_severity Major, tag Stealer, updated_at 2020_09_17;)