ET RETIRED Malformed HeartBeat Request

Query · suricata

flow:established,to_server;
content:"|18 03|"; depth:2;
byte_test:1,<,4,2;
content:"|01|"; offset:5; depth:1;
byte_extract:2,3,record_len;
byte_test:2,>,2,3;
byte_test:2,>,record_len,6;
threshold:type limit,track by_src,count 1,seconds 120;
flowbits:set,ET.MalformedTLSHB;

Rule dependencies

Feeds into

  • 1 rule read ET.MalformedTLSHB · view all
Raw source ET RETIRED Malformed HeartBeat Request · 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 tcp any any -> $HOME_NET !$HTTP_PORTS (
    msg:"ET RETIRED Malformed HeartBeat Request";
    flow:established,to_server;
    content:"|18 03|"; depth:2;
    byte_test:1,<,4,2;
    content:"|01|"; offset:5; depth:1;
    byte_extract:2,3,record_len;
    byte_test:2,>,2,3;
    byte_test:2,>,record_len,6;
    threshold:type limit,track by_src,count 1,seconds 120;
    flowbits:set,ET.MalformedTLSHB;
    reference:cve,2014-0160;
    reference:url,blog.inliniac.net/2014/04/08/detecting-openssl-heartbleed-with-suricata/;
    reference:url,heartbleed.com/;
    reference:url,blog.fox-it.com/2014/04/08/openssl-heartbleed-bug-live-blog/;
    classtype:bad-unknown;
    sid:2018372; rev:4;
    metadata:created_at 2014_04_08, cve CVE_2014_0160, former_category EXPLOIT, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17;
)

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