ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/field-keywords/"; endswith; fast_pattern;
http.cookie;
content:"PREF=ID="; startswith;
pcre:"/^[A-Za-z0-9]{262}$/R";
http.header_names;
content:!"Referer";
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/field-keywords/"; endswith; fast_pattern;
    http.cookie;
    content:"PREF=ID="; startswith;
    pcre:"/^[A-Za-z0-9]{262}$/R";
    http.header_names;
    content:!"Referer";
    reference:md5,52c5b5e9a2ec443769dba5f44c83d7de;
    reference:url,cert.gov.ua/article/703548;
    reference:url,twitter.com/h2jazi/status/1546501374350868481;
    classtype:trojan-activity;
    sid:2037735; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_07_11, deployment Perimeter, malware_family Cobalt_Strike, malware_family TA471, malware_family UNC2589, confidence Medium, signature_severity Major, updated_at 2022_07_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.