AD Groups Or Users Enumeration Using PowerShell - ScriptBlock

Status: test
Severity: low
Log source: category ps_script, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

Adversaries may attempt to find domain-level groups and permission settings. The knowledge of domain-level permission groups can help adversaries determine which groups exist and which users belong to a particular group. Adversaries may use this information to determine which users have elevated permissions, such as domain administrators.

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1069.001` Permission Groups Discovery: Local Groups

Telemetry coverage

Provider	Record / event type
PowerShell	Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: AD Groups Or Users Enumeration Using PowerShell - ScriptBlock
id: 88f0884b-331d-403d-a3a1-b668cf035603
status: test
description: |
    Adversaries may attempt to find domain-level groups and permission settings.
    The knowledge of domain-level permission groups can help adversaries determine which groups exist and which users belong to a particular group.
    Adversaries may use this information to determine which users have elevated permissions, such as domain administrators.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1069.002/T1069.002.md
author: frack113
date: 2021-12-15
modified: 2022-12-25
tags:
    - attack.discovery
    - attack.t1069.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    test_2:
        ScriptBlockText|contains: get-ADPrincipalGroupMembership
    test_7:
        ScriptBlockText|contains|all:
            - get-aduser
            - '-f '
            - '-pr '
            - DoesNotRequirePreAuth
    condition: 1 of test_*
falsepositives:
    - Unknown
level: low

Stages and Predicates

Stage 0: `condition`

1 of test_*

Stage 1: `test_2`

test_2:
    ScriptBlockText|contains: get-ADPrincipalGroupMembership

Stage 2: `test_7`

test_7:
    ScriptBlockText|contains|all:
        - get-aduser
        - '-f '
        - '-pr '
        - DoesNotRequirePreAuth

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ScriptBlockText`	match	`-f` `-pr` `DoesNotRequirePreAuth` `get-ADPrincipalGroupMembership` `get-aduser` corpus 4 (sigma 2, splunk 2)	`field:"ScriptBlockText" kind:match`