alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Backdoor.Agent.qweydh CnC Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/update.php"; endswith; fast_pattern; http.request_body; content:"data="; depth:5; pcre:"/^(?:[A-Za-z0-9%2b%2f]{4})*(?:[A-Za-z0-9%2b%2f]{2}%3d%3d|[A-Za-z0-9%2b%2f]{3}%3d|[A-Za-z0-9%2b%2f]{4})$/Rsi"; http.header_names; content:!"Accept"; content:!"User-Agent"; content:!"Referer"; reference:md5,5dcc10711305c0bd4c8290eaae660ef3; classtype:command-and-control; sid:2025171; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_22, deployment Perimeter, deprecation_reason Age, malware_family Win32_Backdoor_Agent_qweydh, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2023_12_13, reviewed_at 2023_12_13;)