ET WEB_CLIENT Possible Embedded NTLM Hash Theft Code

Query · suricata

flow:established,to_client;
file.data;
content:"src=file|3a 2f 2f 2f 5c 5c|"; nocase; fast_pattern;
content:"|5f|C$|5f|"; nocase; within:50;
content:"visibility|3a|"; nocase; within:50;
content:"hidden"; within:8;
content:"src=";
pcre:"/^\s*[\x22\x27]\s*file\x3a\x2f\x2f\x2f\x5c\x5c[^\x20]+\x5cC\$\x5c\s*[\x22\x27]/Rsi";
Raw source ET WEB_CLIENT Possible Embedded NTLM Hash Theft Code · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_CLIENT Possible Embedded NTLM Hash Theft Code";
    flow:established,to_client;
    file.data;
    content:"src=file|3a 2f 2f 2f 5c 5c|"; nocase; fast_pattern;
    content:"|5f|C$|5f|"; nocase; within:50;
    content:"visibility|3a|"; nocase; within:50;
    content:"hidden"; within:8;
    content:"src=";
    pcre:"/^\s*[\x22\x27]\s*file\x3a\x2f\x2f\x2f\x5c\x5c[^\x20]+\x5cC\$\x5c\s*[\x22\x27]/Rsi";
    reference:url,unit42.paloaltonetworks.com/xhunt-campaign-new-watering-hole-identified-for-credential-harvesting;
    classtype:attempted-user;
    sid:2029329; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2020_01_29, deployment Perimeter, confidence Medium, signature_severity Minor, updated_at 2023_10_11, reviewed_at 2024_04_30;
)

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