ET INFO FUNNULL CDN Domain in DNS Lookup (* .funnull .com)

Query · suricata

dns.query; dotprefix;
content:".funnull.com"; nocase; endswith;
threshold:type limit, count 1, seconds 120, track by_src reference:url,www.silentpush.com/blog/triad-nexus-funnull/;
Raw source ET INFO FUNNULL CDN Domain in DNS Lookup (* .funnull .com) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert dns $HOME_NET any -> any any (
    msg:"ET INFO FUNNULL CDN Domain in DNS Lookup (* .funnull .com)";
    dns.query; dotprefix;
    content:".funnull.com"; nocase; endswith;
    threshold:type limit, count 1, seconds 120, track by_src reference:url,www.silentpush.com/blog/triad-nexus-funnull/;
    reference:url,silentpush.com/blog/infrastructure-laundering/;
    classtype:bad-unknown;
    sid:2061962; rev:1;
    metadata:attack_target Client_and_Server, created_at 2025_04_29, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_04_29, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;
)

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