ET MALWARE Tinba Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Tinba Checkin";
    flow:established,to_server;
    flowbits:set,ET.Tinba.Checkin;
    content:"|0d 0a 0d 0a|";
    content:!"|00 00 00 00|"; within:4;
    content:!"|FF FF FF FF|"; within:4;
    byte_extract:4,0,Tinba.Pivot,relative;
    byte_test:4,=,Tinba.Pivot,16,relative;
    byte_test:4,!=,Tinba.Pivot,4,relative;
    http.method;
    content:"POST";
    http.content_len;
    byte_test:0,>,99,0,string,dec;
    http.start;
    content:"/|20|HTTP/1.0|0d 0a|Host|3a 20|"; fast_pattern;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a 0d 0a|"; depth:26; endswith;
    reference:md5,1e644fe146f62bd2fc585b8df6712ff6;
    classtype:command-and-control;
    sid:2019168; rev:8;
    metadata:created_at 2014_09_12, performance_impact Moderate, signature_severity Major, updated_at 2024_04_08;
)