alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/ASPC Bot CnC Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?key="; fast_pattern; content:"&string="; distance:0; pcre:"/\.php\?key=[^\r\n]+&string=[^\r\n]+?(?:\x3a\x3a[^\x3a]+?){5,}$/i"; http.user_agent; content:"Mozilla/"; startswith; http.request_body; content:"key="; depth:4; content:"&string="; distance:0; http.header_names; content:!"Referer|0d 0a|"; reference:md5,15167239effdfb68bb10467eeea2f24d; classtype:command-and-control; sid:2024321; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_05_18, deployment Perimeter, malware_family ASPC_Bot, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_06;)