ET MALWARE Pikabot Related Activity M5 (POST)

alert http $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Pikabot Related Activity M5 (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/"; startswith;
    pcre:"/^(?:(admin|apps|api))\.[^\r\n]+\.(?:(list|test|listGroups|deny|request|removeGroup|invalidate))$/R";
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:"|0d 0a|Cache-Control|0d 0a|"; startswith;
    content:!"Referer";
    http.request_body;
    content:"|00 00|"; startswith;
    content:"|00 00 12 91 00 00 16 87 00 00 00|"; fast_pattern; distance:2; within:11;
    reference:md5,62a72000766f207bcadb39f449034fc0;
    classtype:trojan-activity;
    sid:2050874; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2024_02_14, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_14;
    target:src_ip;
)