ET MALWARE Zacom/NFlog HTTP POST Fake UA CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Zacom/NFlog HTTP POST Fake UA CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".asp";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.0|3b 20|.NET CLR 1.1.4322|29 |"; depth:69; endswith; fast_pattern;
    http.header_names;
    content:!"Accept-";
    content:!"Referer|0d 0a|";
    content:!"Content-Type|0d 0a|";
    reference:url,researchcenter.paloaltonetworks.com/2015/04/unit-42-identifies-new-dragonok-backdoor-malware-deployed-against-japanese-targets/;
    classtype:command-and-control;
    sid:2020925; rev:5;
    metadata:attack_target Client_Endpoint, created_at 2015_04_16, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)