alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Woody RAT CnC Checkin"; flow:established,to_server; http.request_line; content:"POST /knock HTTP/1.1"; fast_pattern; http.cookie; content:"as="; startswith; pcre:"/[a-f0-9]{24}\.[a-f0-9]{16}/R"; http.header_names; content:!"Referer"; reference:url,blog.malwarebytes.com/threat-intelligence/2022/08/woody-rat-a-new-feature-rich-malware-spotted-in-the-wild; classtype:trojan-activity; sid:2037941; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_08_04, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family WoodyRAT, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_17, reviewed_at 2024_09_17;)