ET RETIRED Malformed HeartBeat Response

Query · suricata

flow:established,from_server;
flowbits:isset,ET.MalformedTLSHB;
content:"|18 03|"; depth:2;
byte_test:1,<,4,2;
byte_test:2,>,200,3;
threshold:type limit,track by_src,count 1,seconds 120;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET RETIRED Malformed HeartBeat Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET [!$HTTP_PORTS,!445,!22] -> any any (
    msg:"ET RETIRED Malformed HeartBeat Response";
    flow:established,from_server;
    flowbits:isset,ET.MalformedTLSHB;
    content:"|18 03|"; depth:2;
    byte_test:1,<,4,2;
    byte_test:2,>,200,3;
    threshold:type limit,track by_src,count 1,seconds 120;
    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:2018373; rev:6;
    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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