[New Rule] GCP Key Created for Service Account (#314)

* new-rule-gcp-key-created-for-service-account * Add FP info to rule * Update 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>
2020-09-24 09:16:18 -06:00
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+[metadata]
+creation_date = "2020/09/21"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/09/21"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies when a new key is created for a service account in Google Cloud Platform (GCP). A service account is a
+special type of account used by an application or a virtual machine (VM) instance, not a person. Applications use
+service accounts to make authorized API calls, authorized as either the service account itself, or as G Suite or Cloud
+Identity users through domain-wide delegation. If private keys are not tracked and managed properly, they can present a
+security risk. An adversary may create a new key for a service account in order to attempt to abuse the permissions
+assigned to that account and evade detection.
+"""
+false_positives = [
+    """
+    Service account keys 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 Service Account Key Creation"
+note = "The GCP Filebeat module must be enabled to use this rule."
+references = [
+    "https://cloud.google.com/iam/docs/service-accounts",
+    "https://cloud.google.com/iam/docs/creating-managing-service-account-keys",
+]
+risk_score = 21
+rule_id = "0e5acaae-6a64-4bbc-adb8-27649c03f7e1"
+severity = "low"
+tags = ["Elastic", "GCP", "Continuous Monitoring", "SecOps", "Identity and Access"]
+type = "query"
+
+query = '''
+event.module:googlecloud and event.dataset:googlecloud.audit and event.action:google.iam.admin.v*.CreateServiceAccountKey and event.outcome:success
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1098"
+name = "Account Manipulation"
+reference = "https://attack.mitre.org/techniques/T1098/"
+
+
+[rule.threat.tactic]
+id = "TA0006"
+name = "Credential Access"
+reference = "https://attack.mitre.org/tactics/TA0006/"