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Detection rules › Sigma

PowerShell Scripts Installed as Services - Security

Status
test
Severity
high
Log source
product windows, service security
Author
oscd.community, Natalia Shornikova
Source
github.com/SigmaHQ/sigma

Detects powershell script installed as a Service

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1569.002 System Services: Service Execution

Event coverage

ProviderEventTitle
Security-AuditingEvent ID 4697A service was installed in the system.

Rule body yaml

title: PowerShell Scripts Installed as Services - Security
id: 2a926e6a-4b81-4011-8a96-e36cc8c04302
related:
    - id: a2e5019d-a658-4c6a-92bf-7197b54e2cae
      type: derived
status: test
description: Detects powershell script installed as a Service
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse
author: oscd.community, Natalia Shornikova
date: 2020-10-06
modified: 2022-11-29
tags:
    - attack.execution
    - attack.t1569.002
logsource:
    product: windows
    service: security
    definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
detection:
    selection:
        EventID: 4697
        ServiceFileName|contains:
            - 'powershell'
            - 'pwsh'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 4697
    ServiceFileName|contains:
        - 'powershell'
        - 'pwsh'

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
ServiceFileNamematch
  • powershell corpus 4 (sigma 4)
  • pwsh