ET MALWARE Cobalt Strike Beacon Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/static-directory/bn.png"; fast_pattern; bsize:24;
http.header_names;
content:!"Referer";
http.user_agent;
content:"Linux|3b 20|Android|20|";
Raw source ET MALWARE Cobalt Strike Beacon Activity (GET) · 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 Cobalt Strike Beacon Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/static-directory/bn.png"; fast_pattern; bsize:24;
    http.header_names;
    content:!"Referer";
    http.user_agent;
    content:"Linux|3b 20|Android|20|";
    reference:url,twitter.com/kienbigmummy/status/1468836018560192512;
    reference:md5,f3e31cd5f0972e4dbc789807ad2d129b;
    classtype:trojan-activity;
    sid:2034646; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_12_09, deployment Perimeter, deployment SSLDecrypt, malware_family CobaltStrike, confidence Medium, signature_severity Major, tag c2, updated_at 2021_12_09, reviewed_at 2023_08_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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