ET HUNTING SUSPICIOUS PSHELL Downloader Primitives B641 Oct 19 2017

Query · suricata

flow:established,from_server;
file_data;
content:"U3RhcnQtUHJvY2Vzc";
pcre:"/(?:RG93bmxvYWRGaWxl|Rvd25sb2FkRmlsZ|Eb3dubG9hZEZpbG)/";
pcre:"/(?:V3JpdGUtSG9zd|dyaXRlLUhvc3|Xcml0ZS1Ib3N0)/";
pcre:"/U3lzdGVtLk5ldC5XZWJDbGllbn|N5c3RlbS5OZXQuV2ViQ2xpZW50|TeXN0ZW0uTmV0LldlYkNsaWVud/";
Raw source ET HUNTING SUSPICIOUS PSHELL Downloader Primitives B641 Oct 19 2017 · 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 HUNTING SUSPICIOUS PSHELL Downloader Primitives B641 Oct 19 2017";
    flow:established,from_server;
    file_data;
    content:"U3RhcnQtUHJvY2Vzc";
    pcre:"/(?:RG93bmxvYWRGaWxl|Rvd25sb2FkRmlsZ|Eb3dubG9hZEZpbG)/";
    pcre:"/(?:V3JpdGUtSG9zd|dyaXRlLUhvc3|Xcml0ZS1Ib3N0)/";
    pcre:"/U3lzdGVtLk5ldC5XZWJDbGllbn|N5c3RlbS5OZXQuV2ViQ2xpZW50|TeXN0ZW0uTmV0LldlYkNsaWVud/";
    classtype:trojan-activity;
    sid:2024878; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_10_20, deployment Perimeter, malware_family Locky, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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