ET POLICY Tunneled RDP msts Handshake

Query · suricata

dsize:<65;
content:"|03 00 00|"; depth:3;
content:"|e0|"; distance:2; within:1;
content:"Cookie|3a 20|mstshash="; distance:5; within:17;
Raw source ET POLICY Tunneled RDP msts Handshake · 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 [21,22,23,25,53,80,443,8080] -> any !3389 (
    msg:"ET POLICY Tunneled RDP msts Handshake";
    dsize:<65;
    content:"|03 00 00|"; depth:3;
    content:"|e0|"; distance:2; within:1;
    content:"Cookie|3a 20|mstshash="; distance:5; within:17;
    reference:url,www.fireeye.com/blog/threat-research/2019/01/bypassing-network-restrictions-through-rdp-tunneling.html;
    classtype:bad-unknown;
    sid:2027192; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_04_11, deployment Perimeter, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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