MSExchange Transport Agent Installation — Sigma Rule

Rule metadata and linked tags

Author: Tobias Michalski (Nextron Systems). Source status: test; severity: medium. Source dates: 2021-06-08 / 2022-10-09.

{
  "product": "windows",
  "category": "process_creation"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 47cf9f6b6f9695d6ea50743c1760ddf662af7d9ce046ee9d1bd1177d4d8c3918

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
id: 83809e84-4475-4b69-bc3e-4aad8568612f
related:
    - id: 83809e84-4475-4b69-bc3e-4aad8568612f
      type: similar
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: 2022-10-09
tags:
    - attack.persistence
    - attack.t1505.002
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        CommandLine|contains: '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