alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/CopperStealer CnC Activity M2"; flow:established,to_server; http.method; content:"POST"; http.host; content:"|2e|"; offset:16; depth:1; pcre:"/^[a-f0-9]{16}\./"; http.request_body; content:"info="; startswith; fast_pattern; pcre:"/^[A-Za-z0-9\-_~]{75,}$/R"; http.header_names; content:!"Referer"; reference:md5,b0110812a72552902f0bd69d640b8e1c; classtype:trojan-activity; sid:2031926; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_30, deployment Perimeter, malware_family Win32_CopperStealer, confidence High, signature_severity Major, updated_at 2021_09_21;)