[New Rule] GCP Pub/Sub Topic Deletion

rules/gcp/defense_evasion_gcp_pub_sub_topic_deletion.toml

@@ -0,0 +1,50 @@
+[metadata]
+creation_date = "2020/09/18"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/09/18"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the deletion of a topic in Google Cloud Platform (GCP). In GCP, the publisher-subscriber relationship
+(Pub/Sub) is an asynchronous messaging service that decouples event-producing and event-processing services. A publisher
+application creates and sends messages to a topic. Deleting a topic can interrupt message flow in the Pub/Sub pipeline.
+"""
+false_positives = [
+    """
+    Topic deletions may be done by a system or network administrator. Verify whether the user email, resource name,
+    and/or hostname should be making changes in your environment. Topic deletions from unfamiliar users or hosts should
+    be investigated. If known behavior is causing false positives, it can be exempted from the rule.
+    """,
+]
+index = ["filebeat-*"]
+language = "kuery"
+license = "Elastic License"
+name = "GCP Pub/Sub Topic Deletion"
+note = "The GCP Filebeat module must be enabled to use this rule."
+references = ["https://cloud.google.com/pubsub/docs/overview"]
+risk_score = 21
+rule_id = "3202e172-01b1-4738-a932-d024c514ba72"
+severity = "low"
+tags = ["Elastic", "GCP", "Continuous Monitoring", "SecOps", "Logging"]
+type = "query"
+
+query = '''
+event.module:googlecloud and event.dataset:googlecloud.audit and event.action:google.pubsub.v*.Publisher.DeleteTopic and event.outcome:success
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1562"
+name = "Impair Defenses"
+reference = "https://attack.mitre.org/techniques/T1562/"
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"
+