ET MALWARE Tendrit CnC Beacon 2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/favicon?"; depth:9;
http.uri.raw;
pcre:"/^[a-z]{2,}=(?:%[A-F0-9]{2})+&/R";
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE Tendrit CnC Beacon 2 · 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 Tendrit CnC Beacon 2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/favicon?"; depth:9;
    http.uri.raw;
    pcre:"/^[a-z]{2,}=(?:%[A-F0-9]{2})+&/R";
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,755dad1f37a9d3fae1352dbbc409102c;
    reference:url,pwc.blogs.com/cyber_security_updates/2014/12/festive-spearphishing-merry-christmas-from-an-apt-actor.html;
    classtype:command-and-control;
    sid:2019986; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2014_12_22, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_05_14, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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