ET MALWARE Cobalt Strike Activity (GET)

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET /9Wla HTTP/1.1"; fast_pattern;
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Activity (GET)";
    flow:established,to_server;
    http.request_line;
    content:"GET /9Wla HTTP/1.1"; fast_pattern;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:!"Referer";
    reference:md5,ac45cc9b586d30836bb2997745a5208e;
    reference:url,twitter.com/malwrhunterteam/status/1455885521905934339;
    classtype:trojan-activity;
    sid:2034347; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_11_05, deployment Perimeter, 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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