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Detection rules › Sigma

MSExchange Transport Agent Installation

Status
test
Severity
medium
Log source
category process_creation, product windows
Author
Tobias Michalski (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the Installation of a Exchange Transport Agent

Known false positives

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

MITRE ATT&CK coverage

TacticTechniques
Persistence

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 1: Process creation
Security-AuditingEvent ID 4688: A new process has been created.

Rule body

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains: 'Install-TransportAgent'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • Install-TransportAgent
field:"CommandLine" kind:match value:"Install-TransportAgent"