Google Workspace Marketplace Allowlist Configuration

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

rule google_workspace_marketplace_allowlist_configuration {

  meta:
    author = "Google Cloud Security"
    description = "Identifies when the Google Workspace Marketplace allowlist is configured to allow users to install and run any apps from the Marketplace. Allowing users to install and run any apps may increase the organization's risk of data exfiltration/leakage and increase its attack surface."
    rule_id = "mr_3dd74ce1-27cb-4c57-b4cf-4cfb29293ab5"
    rule_name = "Google Workspace Marketplace Allowlist Configuration"
    mitre_attack_tactic = "Defense Evasion"
    mitre_attack_technique = "Impair Defenses: Disable or Modify Tools"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1562/001/"
    mitre_attack_version = "v13.1"
    type = "Alert"
    data_source = "Workspace Activity"
    severity = "Low"
    priority = "Low"

  events:
    $ws.metadata.vendor_name = "Google Workspace"
    $ws.metadata.product_name = "admin"
    $ws.metadata.product_event_type = "CHANGE_APPLICATION_SETTING"
    $ws.security_result.category_details = "APPLICATION_SETTINGS"
    $ws.target.application = "Google Workspace Marketplace"
    $ws.target.resource.name = "Apps Access Setting Allowlist access"
    $ws.target.resource.attribute.labels["new_value"] = "ALLOW_ALL"

  outcome:
    $risk_score = max(35)
    $mitre_attack_tactic = "Defense Evasion"
    $mitre_attack_technique = "Impair Defenses: Disable or Modify Tools"
    $mitre_attack_technique_id = "T1562.001"
    $event_count = count_distinct($ws.metadata.id)
    $principal_ip = array_distinct($ws.principal.ip)
    $principal_country = array_distinct($ws.principal.ip_geo_artifact.location.country_or_region)
    $principal_state = array_distinct($ws.principal.ip_geo_artifact.location.state)
    $principal_user_emails = array_distinct($ws.principal.user.email_addresses)
    $principal_user_id = array_distinct($ws.principal.user.userid)
    $target_application = $ws.target.application

  condition:
    $ws
}