ET WEB_SPECIFIC_APPS Microsoft Exchange OWA Authenticated Server-Side Request Forgery (usd-2021-0021) M1

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/owa/service.svc|3f|action|3d|newapp"; fast_pattern; startswith; nocase;
http.request_body;
content:"newappdatarequest"; nocase;
pcre:"/^[^\x0d\x0a]*?(?:\x22|\x2522)[uU][rR][iIlL](?:\x22|\x2522)(?:\x3a|\x253[aA])/R";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Microsoft Exchange OWA Authenticated Server-Side Request Forgery (usd-2021-0021) M1 · 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 any (
    msg:"ET WEB_SPECIFIC_APPS Microsoft Exchange OWA Authenticated Server-Side Request Forgery (usd-2021-0021) M1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/owa/service.svc|3f|action|3d|newapp"; fast_pattern; startswith; nocase;
    http.request_body;
    content:"newappdatarequest"; nocase;
    pcre:"/^[^\x0d\x0a]*?(?:\x22|\x2522)[uU][rR][iIlL](?:\x22|\x2522)(?:\x3a|\x253[aA])/R";
    reference:url,herolab.usd.de/en/security-advisories/usd-2021-0021/;
    classtype:web-application-attack;
    sid:2063626; rev:1;
    metadata:affected_product Microsoft_Exchange, attack_target Server, tls_state TLSDecrypt, created_at 2025_07_21, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2025_07_21, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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