ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/jquery-ajaxSuccess.js"; fast_pattern; bsize:22;
http.cookie;
content:"__cfduid="; startswith;
pcre:"/^[a-zA-Z0-9_-]{171}$/R";
Raw source ET MALWARE Cobalt Strike 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/jquery-ajaxSuccess.js"; fast_pattern; bsize:22;
    http.cookie;
    content:"__cfduid="; startswith;
    pcre:"/^[a-zA-Z0-9_-]{171}$/R";
    reference:md5,cc13942c46fb85a5754570c2b2c06e35;
    classtype:trojan-activity;
    sid:2034057; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_09_30, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_09_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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