ET MALWARE SPEAR CnC Beacon 2

Query · suricata

flow:to_server,established;
http.method;
content:"GET";
http.uri;
content:"?wd="; fast_pattern;
pcre:"/\?wd=(?:[A-Za-z0-9_-]{4})*(?:[A-Za-z0-9_-]{2}==|[A-Za-z0-9_-]{3}=|[A-Za-z0-9_-]{4})$/";
http.header_names;
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE SPEAR 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE SPEAR CnC Beacon 2";
    flow:to_server,established;
    http.method;
    content:"GET";
    http.uri;
    content:"?wd="; fast_pattern;
    pcre:"/\?wd=(?:[A-Za-z0-9_-]{4})*(?:[A-Za-z0-9_-]{2}==|[A-Za-z0-9_-]{3}=|[A-Za-z0-9_-]{4})$/";
    http.header_names;
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:url,blog.cylance.com/spear-a-threat-actor-resurfaces;
    reference:md5,1beb162fc327101c01b07240a924202f;
    classtype:command-and-control;
    sid:2021119; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2015_05_20, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_01, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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