Azure Alert Suppression Rule Created or Modified
editAzure Alert Suppression Rule Created or Modified
editIdentifies 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: 5 minutes
Searches indices from: now-25m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Cloud
- Azure
- Continuous Monitoring
- SecOps
- Configuration Audit
Version: 1
Added (Elastic Stack release): 8.0.0
Rule authors: Austin Songer
Rule license: Elastic License v2
Potential false positives
editSuppression Rules can be created legitimately by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Suppression Rules created by unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
Investigation guide
edit## Config The Azure Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
Rule query
editevent.dataset:azure.activitylogs and azure.activitylogs.operation_name :"MICROSOFT.SECURITY/ALERTSSUPPRESSIONRULES/WRITE" and event.outcome: "success"
Threat mapping
editFramework: 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/