ET MALWARE Bamital Headers - Likely CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Bamital Headers - Likely CnC Beacon";
    flow:established,to_server;
    http.user_agent;
    content:"Mozilla/5.0 (compatible|3b 20|MSIE 9.0|3b 20|Windows NT 6.1|3b 20|WOW64|3b 20|Trident/5.0)"; fast_pattern;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Connection|0d 0a|"; depth:28;
    content:!"Referer";
    content:!"Accept-";
    content:"User-Agent|0d 0a 0d 0a|"; endswith;
    classtype:command-and-control;
    sid:2019755; rev:6;
    metadata:attack_target Client_Endpoint, created_at 2014_11_20, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2020_09_15, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)