ET MALWARE Fake Variation of Mozilla 4.0 - Likely Trojan

Query · suricata

flow:established,to_server;
threshold:type limit, track by_src, count 1, seconds 60;
http.user_agent;
content:"Mozilla/4.0|20 28|compatible|3b 29|"; fast_pattern; endswith;
http.header_names;
content:!"BlueCoat"; nocase;
http.host;
content:!".bluecoat.com";
Raw source ET MALWARE Fake Variation of Mozilla 4.0 - Likely Trojan · 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 MALWARE Fake Variation of Mozilla 4.0 - Likely Trojan";
    flow:established,to_server;
    threshold:type limit, track by_src, count 1, seconds 60;
    http.user_agent;
    content:"Mozilla/4.0|20 28|compatible|3b 29|"; fast_pattern; endswith;
    http.header_names;
    content:!"BlueCoat"; nocase;
    http.host;
    content:!".bluecoat.com";
    classtype:trojan-activity;
    sid:2014002; rev:12;
    metadata:created_at 2011_12_08, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_24;
)

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