ET WEB_CLIENT pshell dl/execute primitives in wideb64 1

Query · suricata

flow:established,to_client;
file_data;
content:"U3RhcnQtUHJvY2Vzc";
content:"cnVuZGxsMz";
content:"VXNlckluaXRNcHJMb2dvblNjcmlwd";
Raw source ET WEB_CLIENT pshell dl/execute primitives in wideb64 1 · 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 WEB_CLIENT pshell dl/execute primitives in wideb64 1";
    flow:established,to_client;
    file_data;
    content:"U3RhcnQtUHJvY2Vzc";
    content:"cnVuZGxsMz";
    content:"VXNlckluaXRNcHJMb2dvblNjcmlwd";
    reference:url,securingtomorrow.mcafee.com/mcafee-labs/apt28-threat-group-adopts-dde-technique-nyc-attack-theme-in-latest-campaign/;
    classtype:trojan-activity;
    sid:2024971; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_11_07, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;
)

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