ET MALWARE Chthonic CnC Beacon 5

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Chthonic CnC Beacon 5";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent;
    content:"Mozilla/6."; fast_pattern; startswith;
    http.request_body;
    pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/";
    http.request_line;
    content:"/ HTTP/1.1";
    http.accept;
    content:"*/*"; depth:3; endswith;
    http.content_len;
    content:!"0";
    http.header_names;
    content:"|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a|"; depth:56;
    content:!"Accept-";
    content:!"Content-Type";
    content:!"Referer|0d 0a|";
    reference:md5,97369af278cc004ce390f68ae94013b6;
    classtype:command-and-control;
    sid:2020944; rev:7;
    metadata:attack_target Client_Endpoint, created_at 2015_04_17, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_28, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)