ET USER_AGENTS Suspicious User-Agent (firefox)

Query · suricata

flow:established,to_server;
http.user_agent;
content:"firefox"; bsize:7; fast_pattern;
Raw source ET USER_AGENTS Suspicious User-Agent (firefox) · 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 USER_AGENTS Suspicious User-Agent (firefox)";
    flow:established,to_server;
    http.user_agent;
    content:"firefox"; bsize:7; fast_pattern;
    reference:url,unit42.paloaltonetworks.com/oilrig-novel-c2-channel-steganography/;
    classtype:trojan-activity;
    sid:2030623; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_07_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_30;
)

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