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Detection rules › Sigma

Active Directory Group Enumeration With Get-AdGroup

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

Detects usage of the "Get-AdGroup" cmdlet to enumerate Groups within Active Directory

MITRE ATT&CK coverage

TacticTechniques
DiscoveryT1069.002 Permission Groups Discovery: Domain Groups

Event coverage

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

Rule body yaml

title: Active Directory Group Enumeration With Get-AdGroup
id: 8c3a6607-b7dc-4f0d-a646-ef38c00b76ee
status: test
description: Detects usage of the "Get-AdGroup" cmdlet to enumerate Groups within Active Directory
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
author: frack113
date: 2022-03-17
modified: 2022-11-17
tags:
    - attack.discovery
    - attack.t1069.002
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'Get-AdGroup '
            - '-Filter'
    condition: selection
falsepositives:
    - Unknown
level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains|all:
        - 'Get-AdGroup '
        - '-Filter'

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
  • -Filter corpus 3 (sigma 2, splunk 1)
  • Get-AdGroup