Azure Blob Permissions Modification
editAzure Blob Permissions Modification
editIdentifies when the Azure role-based access control (Azure RBAC) permissions are modified for an Azure Blob. An adversary may modify the permissions on a blob to weaken their target’s security controls or an administrator may inadvertently modify the permissions, which could lead to data exposure or loss.
Rule type: query
Rule indices:
- filebeat-*
- logs-azure*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-6m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Cloud
- Azure
- Continuous Monitoring
- SecOps
- Identity and Access
Version: 3 (version history)
Added (Elastic Stack release): 7.16.0
Last modified (Elastic Stack release): 8.4.0
Rule authors: Austin Songer
Rule license: Elastic License v2
Potential false positives
editBlob permissions may be modified by system administrators. Verify that the configuration change was expected. Exceptions can be added to this rule to filter expected behavior.
Investigation guide
editRule query
editevent.dataset:azure.activitylogs and azure.activitylogs.operation_name:( "MICROSOFT.STORAGE/STORAGEACC OUNTS/BLOBSERVICES/CONTAINERS/BLOBS/MANAGEOWNERSHIP/ACTION" or "M ICROSOFT.STORAGE/STORAGEACCOUNTS/BLOBSERVICES/CONTAINERS/BLOBS/MODIFYP ERMISSIONS/ACTION") and event.outcome:(Success or success)
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: File and Directory Permissions Modification
- ID: T1222
- Reference URL: https://attack.mitre.org/techniques/T1222/
Rule version history
edit- Version 3 (8.4.0 release)
-
-
Updated query, changed from:
event.dataset:azure.activitylogs and azure.activitylogs.operation_name:( "MICROSOFT.STORAGE/STORAGEACC OUNTS/BLOBSERVICES/CONTAINERS/BLOBS/MANAGEOWNERSHIP/ACTION" or "M ICROSOFT.STORAGE/STORAGEACCOUNTS/BLOBSERVICES/CONTAINERS/BLOBS/MODIFYP ERMISSIONS/ACTION") and event.outcome:(Success or success)
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