Uncommon Connection to Active Directory Web Services

Description

Detects uncommon network connections to the Active Directory Web Services (ADWS) from processes not typically associated with ADWS management.

Query · sigma

selection:
  Initiated: true
  DestinationPort: 9389
filter_main_dsac:
  Image: C:\Windows\system32\dsac.exe
filter_main_ms_monitoring_agent:
  Image: C:\Program Files\Microsoft Monitoring Agent\
filter_main_powershell:
  Image|startswith:
  - C:\Program Files\PowerShell\7\pwsh.exe
  - C:\Program Files\PowerShell\7-preview\pwsh.ex
  - C:\Windows\System32\WindowsPowerShell\
  - C:\Windows\SysWOW64\WindowsPowerShell\
condition: selection and not 1 of filter_main_*

Known false positives

  • ADWS is used by a number of legitimate applications that need to interact with Active Directory. These applications should be added to the allow-listing to avoid false positives.
Raw source Uncommon Connection to Active Directory Web Services · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Uncommon Connection to Active Directory Web Services
id: b3ad3c0f-c949-47a1-a30e-b0491ccae876
status: test
description: |
    Detects uncommon network connections to the Active Directory Web Services (ADWS) from processes not typically associated with ADWS management.
references:
    - https://medium.com/falconforce/soaphound-tool-to-collect-active-directory-data-via-adws-165aca78288c
    - https://github.com/FalconForceTeam/FalconFriday/blob/a9219dfcfd89836f34660223f47d766982bdce46/Discovery/ADWS_Connection_from_Unexpected_Binary-Win.md
author: '@kostastsale'
date: 2024-01-26
tags:
    - attack.discovery
    - attack.t1087
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Initiated: true
        DestinationPort: 9389
    filter_main_dsac:
        Image: 'C:\Windows\system32\dsac.exe'
    filter_main_ms_monitoring_agent:
        Image: 'C:\Program Files\Microsoft Monitoring Agent\'
    filter_main_powershell:
        Image|startswith:
            - 'C:\Program Files\PowerShell\7\pwsh.exe'
            - 'C:\Program Files\PowerShell\7-preview\pwsh.ex'
            - 'C:\Windows\System32\WindowsPowerShell\'
            - 'C:\Windows\SysWOW64\WindowsPowerShell\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - ADWS is used by a number of legitimate applications that need to interact with Active Directory. These applications should be added to the allow-listing to avoid false positives.
level: medium

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