[New Rule] Azure Resource Group Deletion (#158)

* Create impact_resource_group_deletion.toml

* Update rules/azure/impact_resource_group_deletion.toml

Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>

Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>

rules/azure/impact_resource_group_deletion.toml

@@ -0,0 +1,67 @@
+[metadata]
+creation_date = "2020/08/17"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/08/17"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the deletion of a resource group in Azure, which includes all resources within the group. Deletion is
+permanent and irreversible. An adversary may delete a resource group in an attempt to evade defenses or intentionally
+destroy data.
+"""
+false_positives = [
+    """
+    Deletion of a resource group may be done by a system or network administrator. Verify whether the username,
+    hostname, and/or resource name should be making changes in your environment. Resource group deletions from
+    unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted
+    from the rule.
+    """,
+]
+from = "now-25m"
+index = ["filebeat-*"]
+language = "kuery"
+license = "Elastic License"
+name = "Azure Resource Group Deletion"
+note = "The Azure Filebeat module must be enabled to use this rule."
+references = [
+    "https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/manage-resource-groups-portal",
+]
+risk_score = 47
+rule_id = "bb4fe8d2-7ae2-475c-8b5d-55b449e4264f"
+severity = "medium"
+tags = ["Elastic", "Azure", "SecOps", "Continuous Monitoring", "Logging"]
+type = "query"
+
+query = '''
+event.module:azure and event.dataset:azure.activitylogs and event.category:Administrative and azure.activitylogs.operation_name:MICROSOFT.RESOURCES/SUBSCRIPTIONS/RESOURCEGROUPS/DELETE and event.outcome:Success
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1485"
+name = "Data Destruction"
+reference = "https://attack.mitre.org/techniques/T1485/"
+
+
+[rule.threat.tactic]
+id = "TA0040"
+name = "Impact"
+reference = "https://attack.mitre.org/tactics/TA0040/"
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1089"
+name = "Disabling Security Tools"
+reference = "https://attack.mitre.org/techniques/T1089/"
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"