ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET /api/market HTTP/1.1"; fast_pattern;
http.cookie;
content:"nyt-a="; startswith;
pcre:"/^[A-Za-z0-9-_]{176}$/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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET /api/market HTTP/1.1"; fast_pattern;
    http.cookie;
    content:"nyt-a="; startswith;
    pcre:"/^[A-Za-z0-9-_]{176}$/R";
    reference:md5,31b8467ad176116d238afa2fa6bf6497;
    reference:url,twitter.com/h2jazi/status/1483504922003968003;
    classtype:trojan-activity;
    sid:2034941; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_01_19, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2022_01_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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