Elastic Security Detection Rules

External User Added to Google Workspace Group

Last updated 5 days ago on 2024-09-23
Created 2 years ago on 2023-02-16

About

Detects an external Google Workspace user account being added to an existing group. Adversaries may add external user accounts as a means to intercept shared files or emails with that specific group.
Tags
Domain: CloudData Source: Google WorkspaceUse Case: Identity and Access AuditTactic: Initial Access
Severity
medium
Risk Score
47
MITRE ATT&CK™

Initial Access (TA0001)(opens in a new tab or window)

↳ Valid Accounts (T1078)(opens in a new tab or window)

False Positive Examples
Administrators may add external users to groups to share files and communication with them via the intended recipient be the group they are added to. It is unlikely an external user account would be added to an organization's group where administrators should create a new user account.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
filebeat-*logs-google_workspace*
Related Integrations

google_workspace(opens in a new tab or window)

Query
iam where event.dataset == "google_workspace.admin" and event.action == "ADD_GROUP_MEMBER" and
  not endsWith(user.target.email, user.target.group.domain)

Install detection rules in Elastic Security

Detect External User Added to Google Workspace Group in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).