ET INFO NTLMv1 Session Setup Response - Challenge

Query · suricata

flow:established,to_client;
content:"|2b 06 01 04 01 82 37 02 02 0a|";
content:"NTLMSSP|00 02 00 00 00|"; fast_pattern;
threshold:type limit,count 1,seconds 300,track by_dst;
target:dest_ip;
Raw source ET INFO NTLMv1 Session Setup Response - Challenge · 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 any 445 -> $HOME_NET any (
    msg:"ET INFO NTLMv1 Session Setup Response - Challenge";
    flow:established,to_client;
    content:"|2b 06 01 04 01 82 37 02 02 0a|";
    content:"NTLMSSP|00 02 00 00 00|"; fast_pattern;
    threshold:type limit,count 1,seconds 300,track by_dst;
    classtype:misc-activity;
    sid:2067086; 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:dest_ip;
)

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