sigmahighHunting

Powershell Add Name Resolution Policy Table Rule

Detects powershell scripts that adds a Name Resolution Policy Table (NRPT) rule for the specified namespace. This will bypass the default DNS server and uses a specified server for answering the query.

MITRE ATT&CK

T1565

impact

Detection Query

selection:
  ScriptBlockText|contains|all:
    - Add-DnsClientNrptRule
    - -Namesp
    - -NameSe
condition: selection

Author

Borna Talebi

Created

2021-09-14

Data Sources

windowsps_script

Platforms

windows

References

Tags

attack.impactattack.t1565

Raw Content

title: Powershell Add Name Resolution Policy Table Rule
id: 4368354e-1797-463c-bc39-a309effbe8d7
status: test
description: |
  Detects powershell scripts that adds a Name Resolution Policy Table (NRPT) rule for the specified namespace.
  This will bypass the default DNS server and uses a specified server for answering the query.
references:
    - https://twitter.com/NathanMcNulty/status/1569497348841287681
    - https://learn.microsoft.com/en-us/powershell/module/dnsclient/add-dnsclientnrptrule?view=windowsserver2022-ps
author: Borna Talebi
date: 2021-09-14
modified: 2022-10-09
tags:
    - attack.impact
    - attack.t1565
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'Add-DnsClientNrptRule'
            - '-Namesp'
            - '-NameSe'
    condition: selection
falsepositives:
    - Unknown
level: high