M2131_LogRetentionLessThan1Year

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

severity: Medium
name: M2131_LogRetentionLessThan1Year
queryPeriod: 14d
id: 8178a514-1270-4e31-a1d9-aaafeb40122f
requiredDataConnectors: []
kind: Scheduled
tactics:
- Discovery
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:
- fieldMappings:
  - columnName: URLCustomEntity
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: AssessedResourceId
    identifier: ResourceId
  entityType: AzureResource
triggerOperator: gt
queryFrequency: 1d
status: Available
relevantTechniques:
- T1082
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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MaturityModelForEventLogManagementM2131/Analytic Rules/M2131LogRetentionLessThan1Year.yaml
version: 1.0.0

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/8178a514-1270-4e31-a1d9-aaafeb40122f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8178a514-1270-4e31-a1d9-aaafeb40122f')]",
      "properties": {
        "alertRuleTemplateName": "8178a514-1270-4e31-a1d9-aaafeb40122f",
        "customDetails": null,
        "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.'\n",
        "displayName": "M2131_LogRetentionLessThan1Year",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "URLCustomEntity",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "AzureResource",
            "fieldMappings": [
              {
                "columnName": "AssessedResourceId",
                "identifier": "ResourceId"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MaturityModelForEventLogManagementM2131/Analytic Rules/M2131LogRetentionLessThan1Year.yaml",
        "query": "SecurityRecommendation\n| summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId\n| where RecommendationDisplayName == \"Activity log should be retained for at least one year\"\n| summarize Failed = countif(RecommendationState == \"Unhealthy\"), Passed = countif(RecommendationState == \"Healthy\"), Total = countif(RecommendationState == \"Healthy\" or RecommendationState == \"Unhealthy\") by RecommendationDisplayName, AssessedResourceId\n| extend PassedControls = (Passed/todouble(Total))*100\n| extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')\n| project RecommendationDisplayName, AssessedResourceId, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()\n| where Failed > 0\n| sort by Failed desc\n| extend URLCustomEntity = RemediationLink, ResourceId = AssessedResourceId\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery"
        ],
        "techniques": [
          "T1082"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}