[New Rule] GCP Virtual Private Cloud Route Created (#326)

* [New Rule] GCP Virtual Private Cloud Route Created

* Update rule name to align with other rules

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

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

rules/gcp/impact_gcp_virtual_private_cloud_route_created.toml

@@ -0,0 +1,35 @@
+[metadata]
+creation_date = "2020/09/22"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/09/22"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies when a Virtual Private Cloud (VPC) route is created in Google Cloud Platform (GCP). Google Cloud routes
+define the paths that network traffic takes from a virtual machine (VM) instance to other destinations. These
+destinations can be inside a Google VPC network or outside it. An adversary may create a route in order to impact the
+flow of network traffic in their target's cloud environment.
+"""
+false_positives = [
+    """
+    Virtual Private Cloud routes may be created by system administrators. Verify that the configuration change was
+    expected. Exceptions can be added to this rule to filter expected behavior.
+    """,
+]
+index = ["filebeat-*"]
+language = "kuery"
+license = "Elastic License"
+name = "GCP Virtual Private Cloud Route Creation"
+note = "The GCP Filebeat module must be enabled to use this rule."
+references = ["https://cloud.google.com/vpc/docs/routes", "https://cloud.google.com/vpc/docs/using-routes"]
+risk_score = 21
+rule_id = "9180ffdf-f3d0-4db3-bf66-7a14bcff71b8"
+severity = "low"
+tags = ["Elastic", "GCP", "Continuous Monitoring", "SecOps", "Configuration Audit"]
+type = "query"
+
+query = '''
+event.module:googlecloud and event.dataset:googlecloud.audit and event.action:(v*.compute.routes.insert or beta.compute.routes.insert)
+'''