ET WEB_SERVER PHP WebShell Embedded In PNG (INBOUND)

Query · suricata

flow:established,from_server;
file_data;
content:"PNG|0D 0A 1A 0A|"; distance:1; within:7;
content:"<?php"; fast_pattern; distance:0;
Raw source ET WEB_SERVER PHP WebShell Embedded In PNG (INBOUND) · Suricata
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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 -> $HTTP_SERVERS any (
    msg:"ET WEB_SERVER PHP WebShell Embedded In PNG (INBOUND)";
    flow:established,from_server;
    file_data;
    content:"PNG|0D 0A 1A 0A|"; distance:1; within:7;
    content:"<?php"; fast_pattern; distance:0;
    reference:url,blog.spiderlabs.com/2013/10/hiding-webshell-backdoor-code-in-image-files.html;
    classtype:successful-admin;
    sid:2017609; rev:4;
    metadata:created_at 2013_10_17, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_08;
)

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