Azure Alert Suppression Rule Created or Modifiededit
Identifies the creation of suppression rules in Azure. Suppression rules are a mechanism used to suppress alerts previously identified as false positives or too noisy to be in production. This mechanism can be abused or mistakenly configured, resulting in defense evasions and loss of security visibility.
Rule type: query
Rule indices:
- filebeat-*
- logs-azure*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-25m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Cloud
- Data Source: Azure
- Use Case: Configuration Audit
- Tactic: Defense Evasion
Version: 102
Rule authors:
- Austin Songer
Rule license: Elastic License v2
Investigation guideedit
Setupedit
The Azure Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
Rule queryedit
event.dataset:azure.activitylogs and azure.activitylogs.operation_name:"MICROSOFT.SECURITY/ALERTSSUPPRESSIONRULES/WRITE" and event.outcome: "success"
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/