ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET /EbhM HTTP/1.1"; fast_pattern;
http.user_agent;
content:"Mozilla/5.0|20|(compatible|3b 20|MSIE|20|9.0|3b 20|Windows|20|NT|20|6.0|3b 20|Trident/5.0)"; bsize:63;
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 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET /EbhM HTTP/1.1"; fast_pattern;
    http.user_agent;
    content:"Mozilla/5.0|20|(compatible|3b 20|MSIE|20|9.0|3b 20|Windows|20|NT|20|6.0|3b 20|Trident/5.0)"; bsize:63;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:!"Referer";
    reference:md5,72dac7c7f9c50d8ab420acb75132f631;
    reference:url,twitter.com/BlackLotusLabs/status/1456314419215020043;
    classtype:trojan-activity;
    sid:2034346; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_11_05, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag c2, updated_at 2021_11_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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