ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET /image-directory/templates.mp3 HTTP/1.1"; fast_pattern;
http.accept;
content:"image/jpeg"; bsize:10;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Cobalt Strike Activity (GET) · Suricata
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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 Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET /image-directory/templates.mp3 HTTP/1.1"; fast_pattern;
    http.accept;
    content:"image/jpeg"; bsize:10;
    http.header_names;
    content:!"Referer";
    reference:url,twitter.com/malware_traffic/status/1470812160427233294;
    reference:md5,c681c785d6055a1d5a8fe74403c9dfe9;
    classtype:trojan-activity;
    sid:2034728; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_12_14, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_12_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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