ET HUNTING Suspicious Fake Windows User-Agent in HTTP Header

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|29|"; bsize:41; fast_pattern;
content:!"AppleWebKit";
http.host;
content:!"www.pspad.com";
target:src_ip;
Raw source ET HUNTING Suspicious Fake Windows User-Agent in HTTP Header · 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 http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET HUNTING Suspicious Fake Windows User-Agent in HTTP Header";
    flow:established,to_server;
    http.user_agent;
    content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|29|"; bsize:41; fast_pattern;
    content:!"AppleWebKit";
    http.host;
    content:!"www.pspad.com";
    reference:url,bruteratel.com/tabs/ratelserver/c4profiles/;
    classtype:trojan-activity;
    sid:2063592; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_09_15, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_21, reviewed_at 2024_12_02;
    target:src_ip;
)

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