ET MALWARE r0 CnC Check

Query · suricata

flow:to_server,established;
urilen:6;
http.method;
content:"GET";
http.uri;
content:"/check"; fast_pattern;
http.header;
content:"Expect|3a 20|100-continue";
http.user_agent;
content:"Mozilla/5.0 (Windows NT 6.3|3b 20|rv|3a|36.0) Gecko/20100101 Firefox/36.0";
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE r0 CnC Check · 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 r0 CnC Check";
    flow:to_server,established;
    urilen:6;
    http.method;
    content:"GET";
    http.uri;
    content:"/check"; fast_pattern;
    http.header;
    content:"Expect|3a 20|100-continue";
    http.user_agent;
    content:"Mozilla/5.0 (Windows NT 6.3|3b 20|rv|3a|36.0) Gecko/20100101 Firefox/36.0";
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,blog.cari.net/carisirt-defaulting-on-passwords-part-1-r0_bot/;
    classtype:command-and-control;
    sid:2022105; rev:4;
    metadata:created_at 2015_11_17, signature_severity Major, updated_at 2020_06_09;
)

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