ET SCAN MS Terminal Server Traffic on Non-standard Port

Query · suricata

flow:to_server,established;
content:"|03 00 00|"; depth:3;
content:"|e0 00 00 00 00 00|"; offset:5; depth:6;
content:"Cookie|3a 20|mstshash="; fast_pattern;
Raw source ET SCAN MS Terminal Server Traffic on Non-standard Port · 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 $EXTERNAL_NET any -> $HOME_NET !3389 (
    msg:"ET SCAN MS Terminal Server Traffic on Non-standard Port";
    flow:to_server,established;
    content:"|03 00 00|"; depth:3;
    content:"|e0 00 00 00 00 00|"; offset:5; depth:6;
    content:"Cookie|3a 20|mstshash="; fast_pattern;
    classtype:attempted-recon;
    sid:2023753; rev:3;
    metadata:affected_product Microsoft_Terminal_Server_RDP, attack_target Server, created_at 2017_01_23, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2022_09_14;
)

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