alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE KPOT Stealer Initial CnC Activity M4"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/util.php?id="; fast_pattern; pcre:"/^[A-F0-9]+$/Rsi"; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.header_names; content:!"Referer"; reference:md5,5aa703c714e3fa012289bb521687cb0f; classtype:command-and-control; sid:2029837; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_08, deployment Perimeter, malware_family KPOT_Stealer, confidence High, signature_severity Major, updated_at 2020_11_16;)