ET SCAN Nmap NSE Heartbleed Request

Query · suricata

flow:established,to_server;
content:"|18 03|"; depth:2;
byte_test:1,<,4,2;
content:"|01|"; offset:5; depth:1;
byte_test:2,>,2,3;
byte_test:2,>,200,6;
content:"|40 00|Nmap ssl-heartbleed"; fast_pattern;
Raw source ET SCAN Nmap NSE Heartbleed 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 any (
    msg:"ET SCAN Nmap NSE Heartbleed Request";
    flow:established,to_server;
    content:"|18 03|"; depth:2;
    byte_test:1,<,4,2;
    content:"|01|"; offset:5; depth:1;
    byte_test:2,>,2,3;
    byte_test:2,>,200,6;
    content:"|40 00|Nmap ssl-heartbleed"; fast_pattern;
    classtype:attempted-recon;
    sid:2021023; rev:2;
    metadata:created_at 2015_04_28, confidence Medium, signature_severity Minor, updated_at 2022_03_17, reviewed_at 2024_04_19;
)

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