ET SMTP Message Containing search-ms URI With subquery Parameter In Message Body - Possible NTLM Hash Leak Attempt

Query · suricata

flow:established,to_server;
content:"search-ms|3a 2f 2f|query";
content:"&subquery|3d 5c 5c|"; fast_pattern; within:50;
target:dest_ip;
Raw source ET SMTP Message Containing search-ms URI With subquery Parameter In Message Body - Possible NTLM Hash Leak Attempt · 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 smtp any any -> $HOME_NET any (
    msg:"ET SMTP Message Containing search-ms URI With subquery Parameter In Message Body - Possible NTLM Hash Leak Attempt";
    flow:established,to_server;
    content:"search-ms|3a 2f 2f|query";
    content:"&subquery|3d 5c 5c|"; fast_pattern; within:50;
    reference:url,www.varonis.com/blog/outlook-vulnerability-new-ways-to-leak-ntlm-hashes;
    classtype:credential-theft;
    sid:2050426; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_01_24, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Major, updated_at 2024_01_24;
    target:dest_ip;
)

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