ET MALWARE Mustang Panda APT Related Activity (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Mustang Panda APT Related Activity (POST)";
    flow:established,to_server;
    flowbits:set,ET.mustangpanda.numbymane;
    urilen:1;
    http.method;
    content:"POST";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Sec-Dest|0d 0a|Sec-Site|0d 0a|Content-Length|0d 0a|Host|0d 0a 0d 0a|"; endswith;
    http.header;
    content:"|0d 0a|Sec-Dest|3a 20|"; fast_pattern;
    pcre:"/^[0-9A-Za-z]{8}\r\n/R";
    content:"Sec-Site|3a 20|"; distance:0;
    pcre:"/^[0-9A-F]{20}\r\n/R";
    reference:url,twitter.com/StopMalvertisin/status/1635620870214352901;
    reference:url,twitter.com/t3ft3lb/status/1635597523434762240;
    reference:md5,15c74f8c597d2937abae779ee5ef95d7;
    reference:md5,821ec39800471963a4ccef10b587b8d6;
    classtype:trojan-activity;
    sid:2044641; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_03_16, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag TA416, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_16;
    target:src_ip;
)