ET MALWARE TrueBot/Silence.Downloader CnC Checkin 3

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.request_body;
content:"q="; depth:2;
pcre:"/^q=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/i";
http.request_line;
content:".php HTTP/1.0"; endswith; fast_pattern;
http.header_names;
content:!"Referer";
content:!"Accept";
content:!"User-Agent";
Raw source ET MALWARE TrueBot/Silence.Downloader CnC Checkin 3 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE TrueBot/Silence.Downloader CnC Checkin 3";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.request_body;
    content:"q="; depth:2;
    pcre:"/^q=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/i";
    http.request_line;
    content:".php HTTP/1.0"; endswith; fast_pattern;
    http.header_names;
    content:!"Referer";
    content:!"Accept";
    content:!"User-Agent";
    reference:md5,f1a4e74e72390ef98c23f19589d3c7cd;
    reference:url,blog.talosintelligence.com/breaking-the-silence-recent-truebot-activity/;
    classtype:command-and-control;
    sid:2042959; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_01_17, deployment Perimeter, confidence High, signature_severity Major, tag Truebot, updated_at 2022_12_19, former_sid 2834446;
)

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