alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Possible Microsoft Exchange ProxyLogon Activity - OABVirtualDirectory SetObject (CVE-2021-27065)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/ecp/"; content:"/SetObject?"; content:"schema=OABVirtualDirectory"; fast_pattern; http.header_names; to_lowercase; content:"|0d 0a|msexchlogonmailbox|0d 0a|"; http.request_body; content:"__type"; content:"Microsoft.Exchange.Management.ControlPanel"; distance:0; content:"ExternalUrl"; distance:0; reference:url,github.com/praetorian-inc/proxylogon-exploit/blob/main/exploit.py; reference:cve,2021-27065; classtype:attempted-admin; sid:2033754; rev:2; metadata:attack_target Server, created_at 2021_08_20, cve CVE_2021_27065, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_04_25, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)