ET MALWARE XiebroC2 CnC Activity KeepAlive M2 (Outbound)

Query · suricata

flow:established,to_server;
dsize:<100;
content:"|91 36 ff d3 ca 4d 96 3c 50 6b 21 e3 b7 45 d2 86|"; startswith;
target:src_ip;
Raw source ET MALWARE XiebroC2 CnC Activity KeepAlive M2 (Outbound) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE XiebroC2 CnC Activity KeepAlive M2 (Outbound)";
    flow:established,to_server;
    dsize:<100;
    content:"|91 36 ff d3 ca 4d 96 3c 50 6b 21 e3 b7 45 d2 86|"; startswith;
    reference:md5,431e275f4e43ec4ef7c2cc8ba126e9d3;
    reference:url,news.sophos.com/en-us/2024/09/10/crimson-palace-new-tools-tactics-targets/;
    reference:url,github.com/INotGreen/XiebroC2/;
    classtype:command-and-control;
    sid:2058239; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, created_at 2024_12_12, deployment Perimeter, confidence High, signature_severity Major, tag c2, tag Xiebro, updated_at 2024_12_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)

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