ET SMTP EXE - ZIP file with .pif filename inside

Query · suricata

flow:established;
content:"|0D 0A 0D 0A|UmFyI";
pcre:"/^[A-Za-z0-9\/\+\x0D\x0A]+?(LnBpZ|5waW|ucGlm)/R";
Raw source ET SMTP EXE - ZIP file with .pif filename inside · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET SMTP EXE - ZIP file with .pif filename inside";
    flow:established;
    content:"|0D 0A 0D 0A|UmFyI";
    pcre:"/^[A-Za-z0-9\/\+\x0D\x0A]+?(LnBpZ|5waW|ucGlm)/R";
    classtype:bad-unknown;
    sid:2018144; rev:2;
    metadata:created_at 2014_02_15, signature_severity Informational, updated_at 2019_07_26;
)

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