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Detection rules › Sigma

PowerShell Create Local User

Status
test
Severity
medium
Log source
product windows, category ps_script
Author
@ROxPinTeddy
Source
github.com/SigmaHQ/sigma

Detects creation of a local user via PowerShell

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1059.001 Command and Scripting Interpreter: PowerShell
PersistenceT1136.001 Create Account: Local Account

Event coverage

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

Rule body yaml

title: PowerShell Create Local User
id: 243de76f-4725-4f2e-8225-a8a69b15ad61
status: test
description: Detects creation of a local user via PowerShell
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1136.001/T1136.001.md
author: '@ROxPinTeddy'
date: 2020-04-11
modified: 2022-12-25
tags:
    - attack.execution
    - attack.t1059.001
    - attack.persistence
    - attack.t1136.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains: 'New-LocalUser'
    condition: selection
falsepositives:
    - Legitimate user creation
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains: 'New-LocalUser'

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
  • New-LocalUser corpus 2 (sigma 2)