From a05f1601594aef30f002e33c41c2db3378174729 Mon Sep 17 00:00:00 2001
From: David French <56409778+threat-punter@users.noreply.github.com>
Date: Wed, 18 Nov 2020 09:23:15 -0700
Subject: [PATCH] [New Rule] Application Added to Google Workspace Domain
 (#564)

* Create application_added_to_google_workspace_domain.toml

* Update rules/google-workspace/application_added_to_google_workspace_domain.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

* Update rules/google-workspace/application_added_to_google_workspace_domain.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
---
 ...tion_added_to_google_workspace_domain.toml | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 rules/google-workspace/application_added_to_google_workspace_domain.toml

diff --git a/rules/google-workspace/application_added_to_google_workspace_domain.toml b/rules/google-workspace/application_added_to_google_workspace_domain.toml
new file mode 100644
index 000000000..55c10b0af
--- /dev/null
+++ b/rules/google-workspace/application_added_to_google_workspace_domain.toml
@@ -0,0 +1,42 @@
+[metadata]
+creation_date = "2020/11/17"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/11/17"
+
+[rule]
+author = ["Elastic"]
+description = """
+Detects when a Google marketplace application is added to the Google Workspace domain. An adversary may add a malicious application to
+an organization’s Google Workspace domain in order to maintain a presence in their target’s organization and steal data.
+"""
+false_positives = [
+    """
+    Applications can be added to a Google Workspace domain by system administrators. Verify that the configuration change was
+    expected. Exceptions can be added to this rule to filter expected behavior.
+    """,
+]
+from = "now-130m"
+index = ["filebeat-*"]
+interval = "10m"
+language = "kuery"
+license = "Elastic License"
+name = "Application Added to Google Workspace Domain"
+note = """### Important Information Regarding Google Workspace Event Lag Times
+- As per Google's documentation, Google Workspace administrators may observe lag times ranging from minutes up to 3 days between the time of an event's occurrence and the event being visible in the Google Workspace admin/audit logs.
+- This rule is configured to run every 10 minutes with a lookback time of 130 minutes.
+- To reduce the risk of false negatives, consider reducing the interval that the Google Workspace (formerly G Suite) Filebeat module polls Google's reporting API for new events.
+- By default, `var.interval` is set to 2 hours (2h). Consider changing this interval to a lower value, such as 10 minutes (10m).
+- See the following references for further information.
+  - https://support.google.com/a/answer/7061566
+  - https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-module-gsuite.html"""
+references = ["https://support.google.com/a/answer/6328701?hl=en#"]
+risk_score = 47
+rule_id = "785a404b-75aa-4ffd-8be5-3334a5a544dd"
+severity = "medium"
+tags = ["Elastic", "Cloud", "Google Workspace", "Continuous Monitoring", "SecOps", "Configuration Audit"]
+type = "query"
+
+query = '''
+event.dataset:gsuite.admin and event.provider:admin and event.category:iam and event.action:ADD_APPLICATION
+'''