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Detection rules › Sigma

Failed MSExchange Transport Agent Installation

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

Detects a failed 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
MSExchange-CmdletLogsEvent ID 6

Rule body

title: Failed MSExchange Transport Agent Installation
id: c7d16cae-aaf3-42e5-9c1c-fb8553faa6fa
status: test
description: Detects a failed installation of a Exchange Transport Agent
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=8
author: Tobias Michalski (Nextron Systems)
date: 2021-06-08
modified: 2022-07-12
tags:
    - attack.persistence
    - attack.t1505.002
logsource:
    service: msexchange-management
    product: windows
    # warning: The 'data' field used in the detection section is the container for the event data as a whole. You may have to adapt the rule for your backend accordingly
detection:
    selection:
        EventID: 6
        Data|contains: 'Install-TransportAgent'
    condition: selection
falsepositives:
    - Legitimate installations of exchange TransportAgents. AssemblyPath is a good indicator for this.
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 6
    Data|contains: 'Install-TransportAgent'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
Datamatch
  • Install-TransportAgent
field:"Data" kind:match value:"Install-TransportAgent"