Microsoft Sentinel high experimental kql

NRT PIM Elevation Request Rejected

'Identifies when a user is rejected for a privileged role elevation via PIM. Monitor rejections for indicators of attacker compromise of the requesting account. Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-identity-management'

View Source

Detection Logic

AuditLogs
| where ActivityDisplayName =~ 'Add member to role request denied (PIM activation)'
| mv-apply ResourceItem = TargetResources on 
  (
      where ResourceItem.type =~ "Role"
| extend Role = trim(@'"',tostring(ResourceItem.displayName))
  )
| mv-apply ResourceItem = TargetResources on 
  (
      where ResourceItem.type =~ "User"
| extend TargetUserPrincipalName = trim(@'"',tostring(ResourceItem.userPrincipalName))
  )
| where ResultReason != "RoleAssignmentExists"
| where isnotempty(InitiatedBy.user)
| extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
| extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
| extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
| extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
| extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
| extend TargetName = tostring(split(TargetUserPrincipalName,'@',0)[0]), TargetUPNSuffix = tostring(split(TargetUserPrincipalName,'@',1)[0])
| extend InitiatedByName = tostring(split(InitiatingUserPrincipalName,'@',0)[0]), InitiatedByUPNSuffix = tostring(split(InitiatingUserPrincipalName,'@',1)[0])
| project-reorder TimeGenerated, TargetUserPrincipalName, Role, OperationName, Result, ResultDescription

Field Validations

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