[New Rule] Add AWS Password Recovery Requested

rules/aws/initial_access_password_recovery.toml

@@ -0,0 +1,50 @@
+[metadata]
+creation_date = "2020/07/02"
+ecs_version = ["1.5.0"]
+maturity = "production"
+updated_date = "2020/07/02"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies AWS IAM password recovery requests. An adversary may attempt to gain unauthorized AWS access by abusing
+password recovery mechanisms.
+"""
+false_positives = [
+    """
+    Verify whether the user identity, user agent, and/or hostname should be requesting changes in your environment.
+    Password reset attempts from unfamiliar users should be investigated. If known behavior is causing false positives,
+    it can be exempted from the rule.
+    """,
+]
+from = "now-20m"
+index = ["filebeat-*"]
+interval = "10m"
+language = "kuery"
+license = "Elastic License"
+name = "AWS IAM Password Recovery Requested"
+references = ["https://www.cadosecurity.com/2020/06/11/an-ongoing-aws-phishing-campaign/"]
+risk_score = 21
+rule_id = "69c420e8-6c9e-4d28-86c0-8a2be2d1e78c"
+severity = "low"
+tags = ["AWS", "Elastic"]
+type = "query"
+
+query = '''
+event.action:PasswordRecoveryRequested and event.provider:signin.amazonaws.com and event.outcome:success
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1078"
+name = "Valid Accounts"
+reference = "https://attack.mitre.org/techniques/T1078/"
+
+
+[rule.threat.tactic]
+id = "TA0001"
+name = "Initial Access"
+reference = "https://attack.mitre.org/tactics/TA0001/"
+