alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Backdoor.Agent.qweydh CnC Checkin M1"; flow:established,to_server; http.request_line; content:"GET|20|/api/up.php|20|HTTP/1.1"; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|"; depth:8; pcre:"/^(?:Connection\r\n)?\r\n$/R"; content:!"Content-Type"; content:!"Accept"; content:!"User-Agent"; content:!"Referer"; reference:md5,5dcc10711305c0bd4c8290eaae660ef3; classtype:command-and-control; sid:2025170; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_22, deployment Perimeter, malware_family Win32_Backdoor_Agent_qweydh, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_24;)