ET RETIRED Possible KV Botnet CnC Checkin

Query · suricata

flow:established,to_server;
dsize:42;
content:"|16 00 2a 03 03|"; startswith; fast_pattern;
content:"|00 20 03 03|"; distance:1; within:4;
isdataat:!33,relative;
target:src_ip;
Raw source ET RETIRED Possible KV Botnet CnC Checkin · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED Possible KV Botnet CnC Checkin";
    flow:established,to_server;
    dsize:42;
    content:"|16 00 2a 03 03|"; startswith; fast_pattern;
    content:"|00 20 03 03|"; distance:1; within:4;
    isdataat:!33,relative;
    reference:url,blog.lumen.com/routers-roasting-on-an-open-firewall-the-kv-botnet-investigation;
    classtype:trojan-activity;
    sid:2049794; rev:3;
    metadata:affected_product Router, attack_target Networking_Equipment, created_at 2023_12_19, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence Low, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17;
    target:src_ip;
)

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