ET WEB_SERVER Possible Encrypted Webshell Download

Query · suricata

flow:established,to_client;
file_data;
content:"eval";
content:"mcrypt_decrypt"; within:30;
Raw source ET WEB_SERVER Possible Encrypted Webshell Download · 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 -> $HTTP_SERVERS any (
    msg:"ET WEB_SERVER Possible Encrypted Webshell Download";
    flow:established,to_client;
    file_data;
    content:"eval";
    content:"mcrypt_decrypt"; within:30;
    reference:url,blog.sucuri.net/2013/10/backdoor-evasion-using-encrypted-content.html;
    classtype:bad-unknown;
    sid:2017640; rev:4;
    metadata:affected_product PHP, attack_target Web_Server, created_at 2013_10_28, deployment Datacenter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_08_19;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.