ET WEB_SERVER Suspected China Chopper Variant Webshell Command (inbound)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"kfaero="; startswith; fast_pattern;
content:"&Z1="; distance:0; within:5;
content:"&Z2="; distance:0;
Raw source ET WEB_SERVER Suspected China Chopper Variant Webshell Command (inbound) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SERVER Suspected China Chopper Variant Webshell Command (inbound)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"kfaero="; startswith; fast_pattern;
    content:"&Z1="; distance:0; within:5;
    content:"&Z2="; distance:0;
    reference:url,www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/;
    classtype:attempted-admin;
    sid:2038490; rev:1;
    metadata:attack_target Web_Server, created_at 2022_08_11, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_11, reviewed_at 2024_05_07;
)

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