ET INFO Observed Anonymous Domain Registrar Domain (* .njalla .net in TLS SNI)

Query · suricata

flow:established,to_server;
tls.sni; dotprefix;
content:".njalla.net"; endswith; fast_pattern;
Raw source ET INFO Observed Anonymous Domain Registrar Domain (* .njalla .net in TLS SNI) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Observed Anonymous Domain Registrar Domain (* .njalla .net in TLS SNI)";
    flow:established,to_server;
    tls.sni; dotprefix;
    content:".njalla.net"; endswith; fast_pattern;
    reference:url,njal.la/about/;
    classtype:misc-activity;
    sid:2064492; rev:1;
    metadata:attack_target Client_and_Server, created_at 2025_09_08, deployment Perimeter, performance_impact Low, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1665, mitre_technique_name Hide_Infrastructure;
)

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