ET MALWARE Cobalt Strike Exfiltration

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.user_agent;
content:"|43 6f 62 61 6c 74 20 53 74 72 69 6b 65 20 42 65 61 63 6f 6e 29|"; fast_pattern; endswith;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Cobalt Strike Exfiltration · 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 Exfiltration";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent;
    content:"|43 6f 62 61 6c 74 20 53 74 72 69 6b 65 20 42 65 61 63 6f 6e 29|"; fast_pattern; endswith;
    http.header_names;
    content:!"Referer";
    classtype:targeted-activity;
    sid:2025636; rev:3;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2018_07_03, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16;
)

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