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Detection rules › Sigma

Remove Exported Mailbox from Exchange Webserver

Status
test
Severity
high
Log source
product windows, service msexchange-management
Author
Christian Burkard (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects removal of an exported Exchange mailbox which could be to cover tracks from ProxyShell exploit

MITRE ATT&CK coverage

TacticTechniques
Stealth

Rule body

title: Remove Exported Mailbox from Exchange Webserver
id: 09570ae5-889e-43ea-aac0-0e1221fb3d95
status: test
description: Detects removal of an exported Exchange mailbox which could be to cover tracks from ProxyShell exploit
references:
    - https://github.com/rapid7/metasploit-framework/blob/1416b5776d963f21b7b5b45d19f3e961201e0aed/modules/exploits/windows/http/exchange_proxyshell_rce.rb#L430
author: Christian Burkard (Nextron Systems)
date: 2021-08-27
modified: 2023-01-23
tags:
    - attack.stealth
    - attack.t1070
logsource:
    service: msexchange-management
    product: windows
detection:
    keywords:
        '|all':
            - 'Remove-MailboxExportRequest'
            - ' -Identity '
            - ' -Confirm "False"'
    condition: keywords
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

keywords

Stage 1: keywords

keywords:
    '|all':
        - 'Remove-MailboxExportRequest'
        - ' -Identity '
        - ' -Confirm "False"'