Exchange Set OabVirtualDirectory ExternalUrl Property

Description

Rule to detect an adversary setting OabVirtualDirectory External URL property to a script in Exchange Management log

Query · sigma

keywords:
  '|all':
  - Set-OabVirtualDirectory
  - ExternalUrl
  - Page_Load
  - script
condition: keywords

Known false positives

  • Unknown
Raw source Exchange Set OabVirtualDirectory ExternalUrl Property · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Exchange Set OabVirtualDirectory ExternalUrl Property
id: 9db37458-4df2-46a5-95ab-307e7f29e675
status: test
description: Rule to detect an adversary setting OabVirtualDirectory External URL property to a script in Exchange Management log
references:
    - https://twitter.com/OTR_Community/status/1371053369071132675
author: Jose Rodriguez @Cyb3rPandaH
date: 2021-03-15
modified: 2023-01-23
tags:
    - attack.persistence
    - attack.t1505.003
logsource:
    product: windows
    service: msexchange-management
detection:
    keywords:
        '|all':
            - 'Set-OabVirtualDirectory'
            - 'ExternalUrl'
            - 'Page_Load'
            - 'script'
    condition: keywords
falsepositives:
    - Unknown
level: high

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