ET HUNTING SUSPICIOUS Possible WebShell Login Form (Outbound)

Query · suricata

flow:established,from_server;
file_data;
content:"<pre align=center><form method=post>Password|3a| <input type=password name=pass><input type=submit value=|27|>>|27|></form></pre>"; within:120;
isdataat:!2,relative;
Raw source ET HUNTING SUSPICIOUS Possible WebShell Login Form (Outbound) · 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 $HTTP_SERVERS any -> $EXTERNAL_NET any (
    msg:"ET HUNTING SUSPICIOUS Possible WebShell Login Form (Outbound)";
    flow:established,from_server;
    file_data;
    content:"<pre align=center><form method=post>Password|3a| <input type=password name=pass><input type=submit value=|27|>>|27|></form></pre>"; within:120;
    isdataat:!2,relative;
    reference:url,blog.malwaremustdie.org/2014/05/elf-shared-so-dynamic-library-malware.html;
    classtype:trojan-activity;
    sid:2018459; rev:2;
    metadata:created_at 2014_05_09, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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