ET EXPLOIT Possible Microsoft Exchange RCE with Python PSRP Client UA Inbound (CVE-2021-34473)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/autodiscover/autodiscover.json?";
http.user_agent;
content:"Python|20|PSRP|20|Client"; fast_pattern;
Raw source ET EXPLOIT Possible Microsoft Exchange RCE with Python PSRP Client UA Inbound (CVE-2021-34473) · 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 any any -> [$HOME_NET,$HTTP_SERVERS] [443,444] (
    msg:"ET EXPLOIT Possible Microsoft Exchange RCE with Python PSRP Client UA Inbound (CVE-2021-34473)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/autodiscover/autodiscover.json?";
    http.user_agent;
    content:"Python|20|PSRP|20|Client"; fast_pattern;
    reference:cve,2021-34473;
    classtype:attempted-admin;
    sid:2033712; rev:1;
    metadata:affected_product Microsoft_Exchange, attack_target Server, created_at 2021_08_12, cve CVE_2021_34473, deployment Perimeter, deployment Internal, confidence Medium, 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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