alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/OriginLoader CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/gate"; http.header; content:"x-key|3a 20|"; fast_pattern; pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}/R"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|x-key|0d 0a|User-Agent|0d 0a|Content-Type|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a 0d 0a|"; http.request_body; content:"p="; startswith; threshold:type limit, count 5, seconds 300, track by_src; reference:md5,ecfb74b93750609b906f519809d45556; reference:url,tria.ge/230728-zryfwaac8y/; reference:url,www.fortinet.com/blog/threat-research/originbotnet-spreads-via-malicious-word-document; classtype:trojan-activity; sid:2047004; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_07_31, deployment Perimeter, former_category MALWARE, malware_family Win32_OriginLoader, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17; target:src_ip;)