Rule History

SID: 2033712 • Source: et/open

Versions (5)

Version DetailsCurrent

Rev: 1 • Aug 12, 2021, 12:00 PM

Message:

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

Rule:

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;)

Created:

Aug 12, 2021, 12:00 PM

Updated:

Dec 23, 2022, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

May 30, 2025, 12:04 AM

Filename:

rules/emerging-exploit.rules