Google Workspace Ownership Transferred On Google Drive

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

Identifies when a Google Workspace user transfers the ownership of a file.

MITRE ATT&CK coverage

Tactic	Techniques
Collection	`T1074.002` Data Staged: Remote Data Staging

Telemetry coverage

Platform	Record / event type
Google Workspace	CREATE_DATA_TRANSFER_REQUEST: Data transfer request created

Rules detecting the same action

These rules filter on the same operation.

Google Workspace Drive Data Transfer or Takeout Export Initiated (Elastic)

Rule body

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

rule google_workspace_ownership_transferred_on_google_drive {

  meta:
    author = "Google Cloud Security"
    description = "Identifies when a Google Workspace user transfers the ownership of a file."
    rule_id = "mr_05cddcc9-abf6-4c4c-9518-e2218a1f5c84"
    rule_name = "Google Workspace Ownership Transferred On Google Drive"
    mitre_attack_tactic = "Collection"
    mitre_attack_technique = "Data Staged: Remote Data Staging"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1074/002/"
    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 = "CREATE_DATA_TRANSFER_REQUEST"
    $ws.security_result.category_details = "USER_SETTINGS"

  outcome:
    $risk_score = max(70)
    $mitre_attack_tactic = "Collection"
    $mitre_attack_technique = "Data Staged: Remote Data Staging"
    $mitre_attack_technique_id = "T1074.002"
    $event_count = count_distinct($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)
    $target_user_emails = array_distinct($ws.target.user.email_addresses)
    $principal_user_id = $ws.principal.user.userid
    $target_application = $ws.target.application
    $src_user_emails = array_distinct($ws.src.user.email_addresses)

  condition:
    $ws
}

YARA-L rule structure

Condition

Fires when at least one $ws event.

Events

`$ws`

metadata.product_event_type = "CREATE_DATA_TRANSFER_REQUEST"
security_result.category_details = "USER_SETTINGS"

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(70)`
`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($ws.principal.user.email_addresses)`
`target_user_emails`	`array_distinct($ws.target.user.email_addresses)`
`principal_user_id`	`$ws.principal.user.userid`
`target_application`	`$ws.target.application`
`src_user_emails`	`array_distinct($ws.src.user.email_addresses)`