ET INFO Dotted Quad Host M2 (noalert)

Query · suricata

flow:established,to_server;
flowbits:set,http.dottedquadhost;
flowbits:noalert;
http.header.raw;
content:"host|3a 20|2"; nocase; fast_pattern;
pcre:"/^\d{0,2}\.(?:\d{1,3}\.){2}\d{1,3}(?:\x3a\d{1,5})?/R";

Rule dependencies

Feeds into

  • 23 rules read http.dottedquadhost · view all
Raw source ET INFO Dotted Quad Host M2 (noalert) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Dotted Quad Host M2 (noalert)";
    flow:established,to_server;
    flowbits:set,http.dottedquadhost;
    flowbits:noalert;
    http.header.raw;
    content:"host|3a 20|2"; nocase; fast_pattern;
    pcre:"/^\d{0,2}\.(?:\d{1,3}\.){2}\d{1,3}(?:\x3a\d{1,5})?/R";
    classtype:bad-unknown;
    sid:2021068; rev:5;
    metadata:created_at 2015_05_08, confidence High, signature_severity Informational, updated_at 2025_06_13;
)

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