ET MALWARE Matryoshka CnC Beacon 1

Query · suricata

flow:established,to_server;
urilen:>50;
http.method;
content:"GET";
http.uri;
content:"/img/"; depth:5;
content:"/"; distance:32; within:1;
content:"/general.png"; endswith; fast_pattern;
pcre:"/^\/img\/[a-f0-9]{32}\/[a-f0-9]+\/general\.png$/";
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE Matryoshka 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Matryoshka CnC Beacon 1";
    flow:established,to_server;
    urilen:>50;
    http.method;
    content:"GET";
    http.uri;
    content:"/img/"; depth:5;
    content:"/"; distance:32; within:1;
    content:"/general.png"; endswith; fast_pattern;
    pcre:"/^\/img\/[a-f0-9]{32}\/[a-f0-9]+\/general\.png$/";
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,9853fc1f4d7ba23d728f4ee80842faf9;
    reference:url,minerva-labs.com/#!CopyKittens-Attack-Group/c7a5/5655651e0cf20a760c4cae95;
    classtype:command-and-control;
    sid:2022146; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2015_11_25, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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