ET POLICY Inbound RDP Connection with TLS Security Protocol Requested

Query · suricata

flow:established,to_server;
dsize:<30;
content:"|00 00|"; offset:1; depth:2;
content:"|e0|"; distance:2; within:1;
content:"|01 00 08 00 01 00 00 00|"; within:15; fast_pattern; endswith;
Raw source ET POLICY Inbound RDP Connection with TLS Security Protocol Requested · 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 -> any 3389 (
    msg:"ET POLICY Inbound RDP Connection with TLS Security Protocol Requested";
    flow:established,to_server;
    dsize:<30;
    content:"|00 00|"; offset:1; depth:2;
    content:"|e0|"; distance:2; within:1;
    content:"|01 00 08 00 01 00 00 00|"; within:15; fast_pattern; endswith;
    reference:url,medium.com/@bromiley/what-happens-before-hello-ce9f29fa0cef;
    classtype:bad-unknown;
    sid:2027412; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_05_31, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_08_19;
)

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