ET INFO NTLM Session Setup Request - Auth

Query · suricata

flow:established,to_server;
content:"NTLMSSP|00 03 00 00 00|"; fast_pattern;
threshold:type limit,count 1,seconds 300,track by_src;
target:src_ip;
Raw source ET INFO NTLM Session Setup Request - Auth · 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-pkt $HOME_NET any -> any 445 (
    msg:"ET INFO NTLM Session Setup Request - Auth";
    flow:established,to_server;
    content:"NTLMSSP|00 03 00 00 00|"; fast_pattern;
    threshold:type limit,count 1,seconds 300,track by_src;
    classtype:misc-activity;
    sid:2067087; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_01_26, deployment Perimeter, deployment Internal, performance_impact Significant, confidence Medium, signature_severity Informational, updated_at 2026_01_26;
    target:src_ip;
)

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