""ET EXPLOIT Possible Microsoft Exchange ProxyLogon Activity - OABVirtualDirectory SetObject (CVE-2021-27065)""

SID: 2033754

Revision: 1

Class Type: attempted-admin

Metadata: attack_target Server, created_at 2021_08_20, cve CVE_2021_27065, deployment Perimeter, deployment Internal, signature_severity Major, tag Exploit, updated_at 2021_08_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application

Reference:

  • cve

  • 2021-27065

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: [$HOME_NET,$HTTP_SERVERS]

Destination Port: any

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/ecp/"

  • Value: "/SetObject?"

  • Value: "schema=OABVirtualDirectory"

  • Value: "msExchLogonMailbox|3a|"

  • Value: "__type"

  • Value: "Microsoft.Exchange.Management.ControlPanel"

  • Value: "ExternalUrl"

Within:

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_uri

  • fast_pattern

  • http_uri

  • http_header

  • http_client_body

  • http_client_body

  • http_client_body

source