ET MALWARE DNSpionage Commands Embedded in Webpage Inbound

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"|3c 21 2d 2d|eyJjIjogI"; fast_pattern;
content:"|3c 21 2d 2d|";
pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/R";
Raw source ET MALWARE DNSpionage Commands Embedded in Webpage Inbound · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE DNSpionage Commands Embedded in Webpage Inbound";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"|3c 21 2d 2d|eyJjIjogI"; fast_pattern;
    content:"|3c 21 2d 2d|";
    pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/R";
    reference:url,blog.talosintelligence.com/2018/11/dnspionage-campaign-targets-middle-east.html;
    classtype:targeted-activity;
    sid:2026672; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_11_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag DNSpionage, updated_at 2020_08_27;
)

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