ET INFO Microsoft net.tcp Connection Initialization Activity

Query · suricata

flow:established,to_server;
dsize:<50;
content:"|00 01 00 01 02 02|"; startswith;
content:"net.tcp|3a 2f 2f|"; distance:1; within:11; fast_pattern;
content:"|3a|"; distance:0;
content:"|2f 03 08 0c|"; endswith;
Raw source ET INFO Microsoft net.tcp Connection Initialization Activity · 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 -> $EXTERNAL_NET any (
    msg:"ET INFO Microsoft net.tcp Connection Initialization Activity";
    flow:established,to_server;
    dsize:<50;
    content:"|00 01 00 01 02 02|"; startswith;
    content:"net.tcp|3a 2f 2f|"; distance:1; within:11; fast_pattern;
    content:"|3a|"; distance:0;
    content:"|2f 03 08 0c|"; endswith;
    reference:md5,6b5c7d46224b4d7c38ec620c817867ad;
    classtype:bad-unknown;
    sid:2043233; rev:6;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_22, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_31, reviewed_at 2024_05_06, former_sid 2850027;
)

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