ET MALWARE Possible TRAT proxy component user agent detected

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0.1.3|3b 20|"; nocase; fast_pattern;
Raw source ET MALWARE Possible TRAT proxy component user agent detected · 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 Possible TRAT proxy component user agent detected";
    flow:established,to_server;
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0.1.3|3b 20|"; nocase; fast_pattern;
    reference:url,www.fireeye.com/blog/technical/malware-research/2013/10/evasive-tactics-terminator-rat.html;
    classtype:trojan-activity;
    sid:2017646; rev:6;
    metadata:created_at 2013_10_30, confidence Medium, signature_severity Major, updated_at 2020_04_27;
)

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