ET WEB_SERVER Antsword Related Webshell Activity (Inbound)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/ews/web/webconfig/";
http.header_names;
content:!"Referer";
http.request_body;
content:"|0d 0a|RPDbgEsJF9o8S=|0d 0a|"; fast_pattern;
Raw source ET WEB_SERVER Antsword Related Webshell Activity (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 -> $HOME_NET any (
    msg:"ET WEB_SERVER Antsword Related Webshell Activity (Inbound)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/ews/web/webconfig/";
    http.header_names;
    content:!"Referer";
    http.request_body;
    content:"|0d 0a|RPDbgEsJF9o8S=|0d 0a|"; fast_pattern;
    reference:url,www.gteltsc.vn/blog/warning-new-attack-campaign-utilized-a-new-0day-rce-vulnerability-on-microsoft-exchange-server-12715.html;
    classtype:web-application-attack;
    sid:2039066; rev:1;
    metadata:attack_target Web_Server, created_at 2022_09_29, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_29;
)

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