alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/ASPC Bot CnC Checkin M3"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?string="; fast_pattern; pcre:"/\.php\?string=[a-zA-Z0-9+=]+$/i"; http.user_agent; content:"Mozilla/"; startswith; http.request_body; content:"string="; depth:7; http.header_names; content:!"Referer|0d 0a|"; reference:md5,f392c55f636e93f4b72f1a2aa5022730; classtype:command-and-control; sid:2024625; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_08_30, deployment Perimeter, malware_family Win32_ASPC, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_12;)