M2131_EventLogManagementPostureChanged_EL0

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Id	1f8fcca5-47ed-409d-a8fa-d49ef821feaf
Rulename	M2131_EventLogManagementPostureChanged_EL0
Description	This alert is desinged to monitor Azure policies aligned with the Maturity Model for Event Log Management (M-21-31) standard. The alert triggers when EL0 policy compliance falls below 70% within a 1 week timeframe.
Severity	Medium
Tactics	Discovery
Techniques	T1082
Kind	Scheduled
Query frequency	7d
Query period	7d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MaturityModelForEventLogManagementM2131/Analytic Rules/M2131EventLogManagementPostureChangedEL0.yaml
Version	1.0.0
Arm template	1f8fcca5-47ed-409d-a8fa-d49ef821feaf.json

KQL

SecurityRecommendation
| where RecommendationDisplayName <> ""
| extend MaturityLevel=iff(RecommendationDisplayName has_any("agent","extension","retention","logs encryption","collect","retained","log profile","CloudTrail","metric","AWS","GCP","DNS","Auditing","Flow","logging","usage"), "Event Logging (EL0)",
iff(RecommendationDisplayName has_any("container registries","logic apps","Enhanced monitoring","IoT Hub","Event Hub","App Service", "Kubernetes","updates","email", "automation", "adaptive"), "Advanced Event Logging (EL3)",
iff(RecommendationDisplayName has_any("signatures","CMK","CMEK","double encryption","managed key","KMS","container","Watcher"), "Intermediate Event Logging (EL2)",
iff(RecommendationDisplayName has_any("Exploit Guard","endpoint protection","Antimalware","health","VPC","Defender","Vulnerabilities","vulnerability","diagnostic","Key","activity log alert",""), "Basic Event Logging (EL1)","Other"))))
| summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId, MaturityLevel
| summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by MaturityLevel
| extend PassedControls = (Passed/todouble(Total))*100
| extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')
| project MaturityLevel, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()
| where MaturityLevel <> ''
| where MaturityLevel == "Event Logging (EL0)"
| where PassedControls < 70 
//Adjust Either FailedRatePercentage or PasedRatePercentage Thresholds within   Organizational Needs
| sort by PassedControls desc
| extend URLCustomEntity = RemediationLink

YAML

description: |
    'This alert is desinged to monitor Azure policies aligned with the Maturity Model for Event Log Management (M-21-31) standard. The alert triggers when EL0 policy compliance falls below 70% within a 1 week timeframe.'
kind: Scheduled
tactics:
- Discovery
requiredDataConnectors: []
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MaturityModelForEventLogManagementM2131/Analytic Rules/M2131EventLogManagementPostureChangedEL0.yaml
severity: Medium
name: M2131_EventLogManagementPostureChanged_EL0
triggerThreshold: 0
queryPeriod: 7d
query: |
  SecurityRecommendation
  | where RecommendationDisplayName <> ""
  | extend MaturityLevel=iff(RecommendationDisplayName has_any("agent","extension","retention","logs encryption","collect","retained","log profile","CloudTrail","metric","AWS","GCP","DNS","Auditing","Flow","logging","usage"), "Event Logging (EL0)",
  iff(RecommendationDisplayName has_any("container registries","logic apps","Enhanced monitoring","IoT Hub","Event Hub","App Service", "Kubernetes","updates","email", "automation", "adaptive"), "Advanced Event Logging (EL3)",
  iff(RecommendationDisplayName has_any("signatures","CMK","CMEK","double encryption","managed key","KMS","container","Watcher"), "Intermediate Event Logging (EL2)",
  iff(RecommendationDisplayName has_any("Exploit Guard","endpoint protection","Antimalware","health","VPC","Defender","Vulnerabilities","vulnerability","diagnostic","Key","activity log alert",""), "Basic Event Logging (EL1)","Other"))))
  | summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId, MaturityLevel
  | summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by MaturityLevel
  | extend PassedControls = (Passed/todouble(Total))*100
  | extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')
  | project MaturityLevel, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()
  | where MaturityLevel <> ''
  | where MaturityLevel == "Event Logging (EL0)"
  | where PassedControls < 70 
  //Adjust Either FailedRatePercentage or PasedRatePercentage Thresholds within   Organizational Needs
  | sort by PassedControls desc
  | extend URLCustomEntity = RemediationLink  
relevantTechniques:
- T1082
id: 1f8fcca5-47ed-409d-a8fa-d49ef821feaf
queryFrequency: 7d
status: Available
triggerOperator: gt
version: 1.0.0
entityMappings:
- entityType: URL
  fieldMappings:
  - columnName: URLCustomEntity
    identifier: Url

ARM