ET INFO kcptun Null Encryption Session Initiation - Snappy Compression

Query · suricata

flow:stateless,to_server;
dsize:<200;
content:"sNaPpY"; fast_pattern;
target:src_ip;
Raw source ET INFO kcptun Null Encryption Session Initiation - Snappy Compression · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert udp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO kcptun Null Encryption Session Initiation - Snappy Compression";
    flow:stateless,to_server;
    dsize:<200;
    content:"sNaPpY"; fast_pattern;
    reference:url,github.com/sspanel/kcptun;
    reference:url,github.com/nebulabox/kcptun;
    classtype:misc-activity;
    sid:2072395; rev:1;
    metadata:affected_product Any, attack_target Client_and_Server, tls_state plaintext, created_at 2026_10_08, deployment Perimeter, deployment Internal, performance_impact Low, confidence Medium, signature_severity Informational, tag kcptun, tag tunneling, updated_at 2026_10_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1572, mitre_technique_name Protocol_Tunneling;
    target:src_ip;
)

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