ET RETIRED Woody RAT CnC Checkin

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;
)