ET EXPLOIT Microsoft Exchange Pre-Auth Path Confusion M2 (CVE-2021-31207)

Query · suricata

flow:established,to_server;
http.uri;
content:"/autodiscover?"; nocase;
content:"/mapi/nspi"; nocase; distance:0; fast_pattern;
http.cookie;
content:"Email=autodiscover/"; nocase;
flowbits:set,ET.cve.2021.34473;

Rule dependencies

Feeds into

  • 1 rule read ET.cve.2021.34473 · view all
Raw source ET EXPLOIT Microsoft Exchange Pre-Auth Path Confusion M2 (CVE-2021-31207) · 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 Pre-Auth Path Confusion M2 (CVE-2021-31207)";
    flow:established,to_server;
    http.uri;
    content:"/autodiscover?"; nocase;
    content:"/mapi/nspi"; nocase; distance:0; fast_pattern;
    http.cookie;
    content:"Email=autodiscover/"; nocase;
    flowbits:set,ET.cve.2021.34473;
    reference:cve,2021-31207;
    classtype:attempted-admin;
    sid:2033682; rev:2;
    metadata:affected_product Microsoft_Exchange, attack_target Server, created_at 2021_08_09, cve CVE_2021_31207, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2022_12_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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