[New Rule] Okta User Attempted Unauthorized Access (#1209)

rules/okta/initial_access_okta_user_attempted_unauthorized_access.toml

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+[metadata]
+creation_date = "2021/05/14"
+maturity = "production"
+updated_date = "2021/05/14"
+
+[rule]
+author = ["Elastic", "Austin Songer"]
+description = "Identifies when an unauthorized access attempt is made by a user for an Okta application."
+index = ["filebeat-*", "logs-okta*"]
+language = "kuery"
+license = "Elastic License v2"
+name = "Unauthorized Access to an Okta Application"
+note = """## Config
+
+The Okta Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule."""
+risk_score = 21
+rule_id = "4edd3e1a-3aa0-499b-8147-4d2ea43b1613"
+severity = "low"
+tags = ["Elastic", "Identity", "Okta", "Continuous Monitoring", "SecOps", "Identity and Access"]
+timestamp_override = "event.ingested"
+type = "query"
+
+query = '''
+event.dataset:okta.system and event.action:app.generic.unauth_app_access_attempt
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+name = "Valid Accounts"
+id = "T1078"
+reference = "https://attack.mitre.org/techniques/T1078/"
+
+
+[rule.threat.tactic]
+name = "Initial Access"
+id = "TA0001"
+reference = "https://attack.mitre.org/tactics/TA0001/"
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[rule.threat.tactic]
+name = "Defense Evasion"
+id = "TA0005"
+reference = "https://attack.mitre.org/tactics/TA0005/"
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[rule.threat.tactic]
+name = "Persistence"
+id = "TA0003"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[rule.threat.tactic]
+name = "Privilege Escalation"
+id = "TA0004"
+reference = "https://attack.mitre.org/tactics/TA0004/"