ET POLICY GNU/Linux YUM User-Agent Outbound likely related to package management

Query · suricata

flow:established,to_server;
threshold:type limit, track by_src, count 1, seconds 300;
http.user_agent;
content:"|20|yum|2F|";
Raw source ET POLICY GNU/Linux YUM User-Agent Outbound likely related to package management · 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 POLICY GNU/Linux YUM User-Agent Outbound likely related to package management";
    flow:established,to_server;
    threshold:type limit, track by_src, count 1, seconds 300;
    http.user_agent;
    content:"|20|yum|2F|";
    reference:url,www.phy.duke.edu/~rgb/General/yum_HOWTO/yum_HOWTO/;
    classtype:policy-violation;
    sid:2013505; rev:4;
    metadata:created_at 2011_09_02, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_22;
)

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