[New Rule] Azure Blob Container Access Level Modification (#192)

* Create discovery_blob_container_access_mod.toml * Update rules/azure/discovery_blob_container_access_mod.toml Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com> * lint * Update rules/azure/discovery_blob_container_access_mod.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>
2020-09-04 10:48:21 -04:00
parent 6d3955bd8a
commit e49b69af10
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+[metadata]
+creation_date = "2020/08/20"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/08/20"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies changes to container access levels in Azure. Anonymous public read access to containers and blobs in Azure is
+a way to share data broadly, but can present a security risk if access to sensitive data is not managed judiciously.
+"""
+false_positives = [
+    """
+    Access level modifications 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. Access level modifications 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 Blob Container Access Level Modification"
+note = "The Azure Filebeat module must be enabled to use this rule."
+references = ["https://docs.microsoft.com/en-us/azure/storage/blobs/anonymous-read-access-prevent"]
+risk_score = 21
+rule_id = "2636aa6c-88b5-4337-9c31-8d0192a8ef45"
+severity = "low"
+tags = ["Elastic", "Azure", "SecOps", "Continuous Monitoring", "Asset Visibility"]
+type = "query"
+
+query = '''
+event.module:azure and event.dataset:azure.activitylogs and event.category:Administrative and azure.activitylogs.operation_name:MICROSOFT.STORAGE/STORAGEACCOUNTS/BLOBSERVICES/CONTAINERS/WRITE and event.outcome:Success
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1526"
+name = "Cloud Service Discovery"
+reference = "https://attack.mitre.org/techniques/T1526/"
+
+
+[rule.threat.tactic]
+id = "TA0007"
+name = "Discovery"
+reference = "https://attack.mitre.org/tactics/TA0007/"
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1190"
+name = "Exploit Public-Facing Application"
+reference = "https://attack.mitre.org/techniques/T1190/"
+
+
+[rule.threat.tactic]
+id = "TA0001"
+name = "Initial Access"
+reference = "https://attack.mitre.org/tactics/TA0001/"