ET MALWARE Ransomware Locky CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Ransomware Locky CnC Beacon";
    flow:established,to_server;
    urilen:9;
    http.method;
    content:"POST";
    http.uri;
    content:"/main.php"; fast_pattern;
    http.request_body;
    pcre:"/^.{0,15}[^\x20-\x7e\r\n]/s";
    http.connection;
    content:"Keep-Alive";
    http.content_len;
    byte_test:0,<,110,0,string,dec;
    byte_test:0,>=,100,0,string,dec;
    http.header_names;
    content:!"Referer";
    reference:md5,b06d9dd17c69ed2ae75d9e40b2631b42;
    classtype:command-and-control;
    sid:2022538; rev:7;
    metadata:attack_target Client_Endpoint, created_at 2016_02_17, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_08_20, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)