ET MALWARE Cobalt Strike Beacon Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".gif?utmac="; fast_pattern;
content:"&utmcn="; distance:0;
content:"&utmcs="; distance:0;
http.header_names;
content:!"|0d 0a|Referer|0d 0a|";
content:!"|0d 0a|referer|0d 0a|";
Raw source ET MALWARE Cobalt Strike Beacon Activity · 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 Beacon Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".gif?utmac="; fast_pattern;
    content:"&utmcn="; distance:0;
    content:"&utmcs="; distance:0;
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    content:!"|0d 0a|referer|0d 0a|";
    reference:url,twitter.com/MichalKoczwara/status/1377651431478595588;
    reference:md5,db9214c2f8340ceba664800481f0ca08;
    classtype:trojan-activity;
    sid:2032362; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_04_01, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag c2, updated_at 2023_09_12, reviewed_at 2024_03_12, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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