ET SCAN Nmap NSE Heartbleed Response

Query · suricata

flow:established,from_server;
content:"|18 03|"; depth:2;
byte_test:1,<,4,2;
byte_test:2,>,200,3;
content:"|40 00|Nmap ssl-heartbleed"; fast_pattern;
Raw source ET SCAN Nmap NSE Heartbleed 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 any -> any any (
    msg:"ET SCAN Nmap NSE Heartbleed Response";
    flow:established,from_server;
    content:"|18 03|"; depth:2;
    byte_test:1,<,4,2;
    byte_test:2,>,200,3;
    content:"|40 00|Nmap ssl-heartbleed"; fast_pattern;
    classtype:attempted-recon;
    sid:2021024; rev:2;
    metadata:created_at 2015_04_28, confidence Medium, signature_severity Minor, updated_at 2022_03_17;
)

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