title: Service Account Auth False Positive Filter
id: de13f49e-716a-5982-ae3e-0f99ec71cf95
custom_id: wf-filter-003
status: stable
logsource:
    product: witfoo
    service: artifact-exporter
description: |
    Filters out authentication failure events from known service accounts.
    Service accounts may generate periodic auth failures during credential
    rotation or configuration changes. Customize the service account list
    to match your environment.
author: WitFoo
date: 2026-02-21
tags:
    - attack.credential_access
    - attack.t1110
detection:
    selection:
        messageType: "auth_failure"
    filter_svc:
        userName|contains:
            - "svc_"
            - "service_"
            - "$"
            - "SYSTEM"
            - "LOCAL SERVICE"
            - "NETWORK SERVICE"
    condition: selection and filter_svc
falsepositives:
    - None expected when service account patterns are correctly configured
