ET EXPLOIT Microsoft Exchange Delete User Configuration - xbit set 1 (CVE-2021-42321)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/ews/exchange.asmx"; fast_pattern;
http.request_body;
content:"<?xml";
content:"<soap|3a|Body>";
content:"|3a|DeleteUserConfiguration>";
xbits:set,ET.2021.42321.1,track ip_src,expire 30;
noalert;

Rule dependencies

Feeds into

  • 1 rule read ET.2021.42321.1 · view all
Raw source ET EXPLOIT Microsoft Exchange Delete User Configuration - xbit set 1 (CVE-2021-42321) · 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 EXPLOIT Microsoft Exchange Delete User Configuration - xbit set 1 (CVE-2021-42321)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/ews/exchange.asmx"; fast_pattern;
    http.request_body;
    content:"<?xml";
    content:"<soap|3a|Body>";
    content:"|3a|DeleteUserConfiguration>";
    xbits:set,ET.2021.42321.1,track ip_src,expire 30;
    noalert;
    reference:cve,2021-42321;
    classtype:attempted-admin;
    sid:2034519; rev:1;
    metadata:attack_target Server, created_at 2021_11_22, cve CVE_2021_42321, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_11_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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