ET MALWARE APT28 SEDNIT Variant CnC Beacon 1

Query · suricata

flow:to_server,established;
http.method;
content:"POST";
http.uri;
content:".pdf/?"; fast_pattern;
pcre:"/\.pdf\/\?[A-Za-z0-9]+=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/";
http.header_names;
content:!"Content-Type|0d 0a|";
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE APT28 SEDNIT Variant CnC Beacon 1 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT28 SEDNIT Variant CnC Beacon 1";
    flow:to_server,established;
    http.method;
    content:"POST";
    http.uri;
    content:".pdf/?"; fast_pattern;
    pcre:"/\.pdf\/\?[A-Za-z0-9]+=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/";
    http.header_names;
    content:!"Content-Type|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,c2988e3e4f70d5901b234ff1c1363dcc;
    classtype:targeted-activity;
    sid:2023912; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2016_06_09, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_06, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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