M2131_LogRetentionLessThan1Year

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Id	8178a514-1270-4e31-a1d9-aaafeb40122f
Rulename	M2131_LogRetentionLessThan1Year
Description	This alert is designed to monitor log retention within the Maturity Model for Event Log Management (M-21-31) standard. The alert triggers when a log analytics workspace in active storage is configured for less than 1 year.
Severity	Medium
Tactics	Discovery
Techniques	T1082
Kind	Scheduled
Query frequency	1d
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MaturityModelForEventLogManagementM2131/Analytic Rules/M2131LogRetentionLessThan1Year.yaml
Version	1.0.0
Arm template	8178a514-1270-4e31-a1d9-aaafeb40122f.json

KQL

SecurityRecommendation
| summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId
| where RecommendationDisplayName == "Activity log should be retained for at least one year"
| summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by RecommendationDisplayName, AssessedResourceId
| extend PassedControls = (Passed/todouble(Total))*100
| extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')
| project RecommendationDisplayName, AssessedResourceId, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()
| where Failed > 0
| sort by Failed desc
| extend URLCustomEntity = RemediationLink, ResourceId = AssessedResourceId

YAML

queryFrequency: 1d
kind: Scheduled
version: 1.0.0
relevantTechniques:
- T1082
triggerOperator: gt
status: Available
requiredDataConnectors: []
id: 8178a514-1270-4e31-a1d9-aaafeb40122f
name: M2131_LogRetentionLessThan1Year
query: |
  SecurityRecommendation
  | summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId
  | where RecommendationDisplayName == "Activity log should be retained for at least one year"
  | summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by RecommendationDisplayName, AssessedResourceId
  | extend PassedControls = (Passed/todouble(Total))*100
  | extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')
  | project RecommendationDisplayName, AssessedResourceId, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()
  | where Failed > 0
  | sort by Failed desc
  | extend URLCustomEntity = RemediationLink, ResourceId = AssessedResourceId  
queryPeriod: 14d
triggerThreshold: 0
description: |
    'This alert is designed to monitor log retention within the Maturity Model for Event Log Management (M-21-31) standard. The alert triggers when a log analytics workspace in active storage is configured for less than 1 year.'
entityMappings:
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: URLCustomEntity
- entityType: AzureResource
  fieldMappings:
  - identifier: ResourceId
    columnName: AssessedResourceId
severity: Medium
tactics:
- Discovery
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MaturityModelForEventLogManagementM2131/Analytic Rules/M2131LogRetentionLessThan1Year.yaml

ARM