ET MALWARE Cobalt Strike Malleable C2 (Custom)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri; bsize:277;
content:"/api/3.1/query?style="; startswith; fast_pattern;
pcre:"/^[a-z]{256}$/R";
http.header;
content:"Referer|3a 20|https://www.google.com|0d 0a|Accept|3a 20|*/*|0d 0a|Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a|Content-Transfer-Encoding|3a 20|base64|0d 0a|";
Raw source ET MALWARE Cobalt Strike Malleable C2 (Custom) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Malleable C2 (Custom)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:277;
    content:"/api/3.1/query?style="; startswith; fast_pattern;
    pcre:"/^[a-z]{256}$/R";
    http.header;
    content:"Referer|3a 20|https://www.google.com|0d 0a|Accept|3a 20|*/*|0d 0a|Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a|Content-Transfer-Encoding|3a 20|base64|0d 0a|";
    reference:url,twitter.com/CyberRaiju/status/1249272772963864576;
    reference:md5,79bbe1365fb7532613823ce3e0cac499;
    classtype:command-and-control;
    sid:2029977; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_20, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2020_04_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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