ET USER_AGENTS Observed Malicious CASPER/Mirai UA

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Mozilla/4.0   (compatible|3b|   MSIE   5.01|3b|   Windows   NT   5.0)"; bsize:63; fast_pattern;
Raw source ET USER_AGENTS Observed Malicious CASPER/Mirai UA · Suricata
Esc
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 Observed Malicious CASPER/Mirai UA";
    flow:established,to_server;
    http.user_agent;
    content:"Mozilla/4.0   (compatible|3b|   MSIE   5.01|3b|   Windows   NT   5.0)"; bsize:63; fast_pattern;
    reference:url,www.blackberry.com/content/dam/blackberry-com/asset/enterprise/pdf/direct/report-bb-decade-of-the-rats.pdf;
    reference:md5,ea78869555018cdab3699e2df5d7e7f8;
    classtype:misc-activity;
    sid:2029892; rev:1;
    metadata:created_at 2020_04_13, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_13;
)

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