Google Workspace Application Added

Severity: high
Type: Alert
Author: Google Cloud Security
Source: github.com/chronicle/detection-rules

Identifies when a Marketplace app is added in a Google Workspace organization. Installing certain apps may increase the organization's risk of data exfiltration/leakage and increase its attack surface.

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	No specific technique

Telemetry coverage

Platform	Record / event type
Google Workspace	ADD_APPLICATION: Add Application

Rules detecting the same action

These rules filter on the same operation.

Application Added to Google Workspace Domain (Elastic)

Rule body

// Copyright 2023 Google LLC. Licensed under Apache-2.0.

rule google_workspace_application_added {

  meta:
    author = "Google Cloud Security"
    description = "Identifies when a Marketplace app is added in a Google Workspace organization. Installing certain apps may increase the organization's risk of data exfiltration/leakage and increase its attack surface."
    rule_id = "mr_bb4f5ff0-76b8-4b08-8b1b-fcb81e5a10cc"
    rule_name = "Google Workspace Application Added"
    mitre_attack_tactic = "Persistence"
    mitre_attack_technique = ""
    mitre_attack_url = ""
    mitre_attack_version = "v13.1"
    type = "Alert"
    data_source = "Workspace Activity"
    severity = "High"
    priority = "High"

  events:
    $ws.metadata.vendor_name = "Google Workspace"
    $ws.metadata.product_name = "admin"
    $ws.metadata.product_event_type = "ADD_APPLICATION"

  outcome:
    $risk_score = max(75)
    $mitre_attack_tactic = "Persistence"
    $mitre_attack_technique = ""
    $mitre_attack_technique_id = ""
    $event_count = count_distinct($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
    $application_enabled = $ws.target.labels["application_enabled"]
    $application_id = $ws.target.resource.name

  condition:
    $ws
}

YARA-L rule structure

Condition

Fires when at least one $ws event.

Events

`$ws`

metadata.product_event_type = "ADD_APPLICATION"

Outcome

Outcome variables add context to a detection. When the rule generates an alert, $risk_score is displayed with it.

Field	Expression
`risk_score`	`max(75)`
`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`	`$ws.target.application`
`application_enabled`	`$ws.target.labels["application_enabled"]`
`application_id`	`$ws.target.resource.name`