ET WEB_SERVER Suspected Webshell Activity (Inbound)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".jsp?action="; fast_pattern;
content:"&p=C|3a 2f|"; distance:0;
content:"&filename="; distance:0; nocase;
Raw source ET WEB_SERVER Suspected Webshell Activity (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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SERVER Suspected Webshell Activity (Inbound)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".jsp?action="; fast_pattern;
    content:"&p=C|3a 2f|"; distance:0;
    content:"&filename="; distance:0; nocase;
    reference:url,thedfirreport.com/2022/06/06/will-the-real-msiexec-please-stand-up-exploit-leads-to-data-exfiltration/;
    classtype:web-application-attack;
    sid:2037016; rev:1;
    metadata:attack_target Web_Server, created_at 2022_06_16, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_16;
)

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