MSExchange Transport Agent Installation - Builtin — Sigma Rule

Rule metadata and linked tags

Author: Tobias Michalski (Nextron Systems). Source status: test; severity: medium. Source dates: 2021-06-08 / 2022-11-27.

{
  "product": "windows",
  "service": "msexchange-management"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d48e1a382b744920651b0e77496e48c8f6facd9ac92bf6395e17dc7dceb74dc4

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: MSExchange Transport Agent Installation - Builtin
id: 4fe151c2-ecf9-4fae-95ae-b88ec9c2fca6
related:
    - id: 83809e84-4475-4b69-bc3e-4aad8568612f
      type: derived
status: test
description: Detects the Installation of a Exchange Transport Agent
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=7
author: Tobias Michalski (Nextron Systems)
date: 2021-06-08
modified: 2022-11-27
tags:
    - attack.persistence
    - attack.t1505.002
logsource:
    product: windows
    service: msexchange-management
detection:
    selection:
        - 'Install-TransportAgent'
    condition: selection
falsepositives:
    - Legitimate installations of exchange TransportAgents. AssemblyPath is a good indicator for this.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate installations of exchange TransportAgents. AssemblyPath is a good indicator for this.

Source references

• https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=7