ET MALWARE Cobalt Strike Related Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
pcre:"/^[A-Za-z0-9]{4}$/";
http.user_agent;
content:"FunWebProducts|3b|IE0006_ver1|3b|EN_GB"; fast_pattern; endswith;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Cobalt Strike Related 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Related Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/^[A-Za-z0-9]{4}$/";
    http.user_agent;
    content:"FunWebProducts|3b|IE0006_ver1|3b|EN_GB"; fast_pattern; endswith;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:!"Referer";
    reference:url,unit42.paloaltonetworks.com/cobalt-strike-malleable-c2-profile/;
    classtype:trojan-activity;
    sid:2035546; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_03_21, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_07_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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