alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/CoalaBot CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; http.header; content:"User-Agent|3a|"; content:"KAMA NT"; within:50; fast_pattern; content:"BULLET|3b|"; within:20; content:"REGION|3b|"; within:20; http.request_body; pcre:"/^[A-Za-z0-9]{10,}[\-\)\(]{1,2}/i"; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:md5,523de838dd44cdd6f212d36c142d830c; classtype:command-and-control; sid:2024531; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_08_09, deployment Perimeter, malware_family CoalaBot, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_19;)