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Detection rules › Sigma

AD Groups Or Users Enumeration Using PowerShell - ScriptBlock

Status
test
Severity
low
Log source
product windows, category ps_script
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

TacticTechniques
DiscoveryT1069.001 Permission Groups Discovery: Local Groups

Event coverage

ProviderEventTitle
PowerShellEvent ID 4104Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body yaml

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

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ScriptBlockTextmatch
  • -f
  • -pr
  • DoesNotRequirePreAuth
  • get-ADPrincipalGroupMembership
  • get-aduser corpus 4 (sigma 2, splunk 2)