[New Rule] Microsoft 365 - Unusual Volume of File Deletion (#1347)

* Create impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update rules/microsoft-365/impact_microsoft_365_unusual_volume_of_file_deletion.toml Co-authored-by: Jonhnathan <jonhnathancesar@gmail.com> * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Update impact_microsoft_365_unusual_volume_of_file_deletion.toml * Add missing `\` * Bump to prod and update description Co-authored-by: Jonhnathan <jonhnathancesar@gmail.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
2021-10-12 16:30:49 -05:00
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+[metadata]
+creation_date = "2021/07/15"
+maturity = "production"
+updated_date = "2021/07/15"
+integration = "o365"
+
+[rule]
+author = ["Austin Songer"]
+description = """
+Identifies that a user has deleted an unusually large volume of files  as reported by Microsoft Cloud App Security.
+"""
+false_positives = ["Users or System Administrator cleaning out folders."]
+from = "now-30m"
+index = ["filebeat-*", "logs-o365*"]
+language = "kuery"
+license = "Elastic License v2"
+name = "Microsoft 365 Unusual Volume of File Deletion"
+note = """## Config
+
+The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
+"""
+references = [
+    "https://docs.microsoft.com/en-us/cloud-app-security/anomaly-detection-policy",
+    "https://docs.microsoft.com/en-us/cloud-app-security/policy-template-reference",
+]
+risk_score = 47
+rule_id = "b2951150-658f-4a60-832f-a00d1e6c6745"
+severity = "medium"
+tags = ["Elastic", "Cloud", "Microsoft 365", "Continuous Monitoring", "SecOps", "Configuration Audit"]
+timestamp_override = "event.ingested"
+type = "query"
+
+query = '''
+event.dataset:o365.audit and event.provider:SecurityComplianceCenter and event.category:web and event.action:"Unusual volume of file deletion" and event.outcome:success
+'''
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+name = "Data Destruction"
+reference = "https://attack.mitre.org/techniques/T1485/"
+id = "T1485"
+
+[rule.threat.tactic]
+name = "Impact"
+reference = "https://attack.mitre.org/tactics/TA0040/"
+id = "TA0040"