ET MALWARE Cobalt Strike Malleable C2 Profile (bg)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/bg"; bsize:3;
http.cookie;
content:"SSID="; startswith; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
Raw source ET MALWARE Cobalt Strike Malleable C2 Profile (bg) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Malleable C2 Profile (bg)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/bg"; bsize:3;
    http.cookie;
    content:"SSID="; startswith; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    reference:md5,5b5a730628dc9eba2c12530d225c2f70;
    classtype:command-and-control;
    sid:2032966; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_17, deployment Perimeter, malware_family Cobalt_Strike, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_05_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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