Google Workspace Government Attack Warning — Sigma Rule

Rule metadata and linked tags

Author: Tom Kluter. Source status: experimental; severity: medium. Source dates: 2026-04-28 / not supplied.

{
  "product": "gcp",
  "service": "google_workspace.login"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 463c397696f37a328222efeac230f842750904060b0c25276547d99abc05737f

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Google Workspace Government Attack Warning
id: eafe6f2b-cfec-4612-aec2-49563c33a087
status: experimental
description: Detects a login attempt in Google Workspace flagged as a potential attack by a government-backed threat actor
references:
    - https://cloud.google.com/logging/docs/audit/gsuite-audit-logging
    - https://cloud.google.com/logging/docs/audit/understanding-audit-logs
    - https://developers.google.com/workspace/admin/reports/v1/appendix/activity/login#gov_attack_warning
author: Tom Kluter
date: 2026-04-28
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.impact
    - attack.stealth
    - attack.t1078
logsource:
    product: gcp
    service: google_workspace.login
detection:
    selection:
        protoPayload.serviceName: 'login.googleapis.com'
        protoPayload.metadata.event.eventName: 'gov_attack_warning'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://cloud.google.com/logging/docs/audit/gsuite-audit-logging
• https://cloud.google.com/logging/docs/audit/understanding-audit-logs
• https://developers.google.com/workspace/admin/reports/v1/appendix/activity/login#gov_attack_warning