Semperis DSP RBAC Changes

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Id	e5edf3f3-de53-45e6-b0d7-1ce1c048df4a
Rulename	Semperis DSP RBAC Changes
Description	Alerts when there are RBAC changes in the DSP system.
Severity	Medium
Tactics	PrivilegeEscalation Persistence
Techniques	T1548 T1098
Required data connectors	SemperisDSP
Kind	Scheduled
Query frequency	30m
Query period	30m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Semperis Directory Services Protector/Analytic Rules/Semperis_DSP_RBAC_Changes.yaml
Version	1.1.1
Arm template	e5edf3f3-de53-45e6-b0d7-1ce1c048df4a.json

KQL

Event 
| where Source == 'Semperis-Operation-Log' and EventID == 20012 
| order by TimeGenerated desc
| extend p1Xml = parse_xml(EventData).DataItem.EventData.Data
| mv-expand bagexpansion=array p1Xml
| evaluate bag_unpack(p1Xml)
| extend Name=column_ifexists('@Name', ''), Value=column_ifexists('#text', '')
| extend det = column_ifexists('details', '')
| parse det with "Occured at (UTC): " OccurredAt "Session ID: " SessionID "Trustee Name: " TrusteeName "Correlation ID: " CorrelationID "Source: " Source "WebSite Target: " WebSiteTarget "Product: " Product "Component: " Component "AD Information: " ADInformation "Object GUID: " ObjectGUID "Attribute: " Attribute "Distinguished Name: " DistinguishedName "Additional Information: "AdditionalInformation "Operation Detail: " OperationDetail "operationName: " operationName "trustee: " trustee "personas: " personas "Status: " status "Granted: " Granted "Result: " Result
| extend _AccessGranted = iif(operationName contains "CreateRbacIdentity", "Added", "Removed")
| extend _Identity = iif(operationName contains "CreateRbacIdentity", trustee, tostring(substring(trustee, 1, strlen(trustee))))
| extend _Identity = iif(operationName contains "CreateRbacIdentity", _Identity, replace_string(_Identity, "'", ""))
| extend add_personas = replace_string(replace_string(replace_string(personas, "{ Name = ", ""), " }", ""), ";", ",")
| extend remove_personas = replace_string(personas, ";", ",")
| extend grid_personas = iif(operationName contains "CreateRbacIdentity", add_personas, remove_personas)
| extend date_to_sort = format_datetime(TimeGenerated, "yyyy-mm-dd   HH:mm:ss")
| order by date_to_sort desc
| extend NTDomain = tostring(split(UserName, '\\', 0)[0]), LoginUser = tostring(split(UserName, '\\', 1)[0])
| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))

YAML

relevantTechniques:
- T1548
- T1098
name: Semperis DSP RBAC Changes
requiredDataConnectors:
- dataTypes:
  - dsp_parser
  connectorId: SemperisDSP
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: LoginUser
  - identifier: NTDomain
    columnName: NTDomain
  entityType: Account
- fieldMappings:
  - identifier: HostName
    columnName: HostName
  - identifier: DnsDomain
    columnName: DnsDomain
  entityType: Host
triggerThreshold: 0
id: e5edf3f3-de53-45e6-b0d7-1ce1c048df4a
tactics:
- PrivilegeEscalation
- Persistence
version: 1.1.1
alertDetailsOverride:
  alertDisplayNameFormat: RBAC Change -- Alert from Semperis Directory Services Protector
  alertDescriptionFormat: A RBAC change was detected in the DSP system.
queryPeriod: 30m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Semperis Directory Services Protector/Analytic Rules/Semperis_DSP_RBAC_Changes.yaml
queryFrequency: 30m
severity: Medium
status: Available
description: |
    'Alerts when there are RBAC changes in the DSP system.'
query: |
  Event 
  | where Source == 'Semperis-Operation-Log' and EventID == 20012 
  | order by TimeGenerated desc
  | extend p1Xml = parse_xml(EventData).DataItem.EventData.Data
  | mv-expand bagexpansion=array p1Xml
  | evaluate bag_unpack(p1Xml)
  | extend Name=column_ifexists('@Name', ''), Value=column_ifexists('#text', '')
  | extend det = column_ifexists('details', '')
  | parse det with "Occured at (UTC): " OccurredAt "Session ID: " SessionID "Trustee Name: " TrusteeName "Correlation ID: " CorrelationID "Source: " Source "WebSite Target: " WebSiteTarget "Product: " Product "Component: " Component "AD Information: " ADInformation "Object GUID: " ObjectGUID "Attribute: " Attribute "Distinguished Name: " DistinguishedName "Additional Information: "AdditionalInformation "Operation Detail: " OperationDetail "operationName: " operationName "trustee: " trustee "personas: " personas "Status: " status "Granted: " Granted "Result: " Result
  | extend _AccessGranted = iif(operationName contains "CreateRbacIdentity", "Added", "Removed")
  | extend _Identity = iif(operationName contains "CreateRbacIdentity", trustee, tostring(substring(trustee, 1, strlen(trustee))))
  | extend _Identity = iif(operationName contains "CreateRbacIdentity", _Identity, replace_string(_Identity, "'", ""))
  | extend add_personas = replace_string(replace_string(replace_string(personas, "{ Name = ", ""), " }", ""), ";", ",")
  | extend remove_personas = replace_string(personas, ";", ",")
  | extend grid_personas = iif(operationName contains "CreateRbacIdentity", add_personas, remove_personas)
  | extend date_to_sort = format_datetime(TimeGenerated, "yyyy-mm-dd   HH:mm:ss")
  | order by date_to_sort desc
  | extend NTDomain = tostring(split(UserName, '\\', 0)[0]), LoginUser = tostring(split(UserName, '\\', 1)[0])
  | extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))  
triggerOperator: gt

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/e5edf3f3-de53-45e6-b0d7-1ce1c048df4a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e5edf3f3-de53-45e6-b0d7-1ce1c048df4a')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "A RBAC change was detected in the DSP system.",
          "alertDisplayNameFormat": "RBAC Change -- Alert from Semperis Directory Services Protector"
        },
        "alertRuleTemplateName": "e5edf3f3-de53-45e6-b0d7-1ce1c048df4a",
        "customDetails": null,
        "description": "'Alerts when there are RBAC changes in the DSP system.'\n",
        "displayName": "Semperis DSP RBAC Changes",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "LoginUser",
                "identifier": "Name"
              },
              {
                "columnName": "NTDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Semperis Directory Services Protector/Analytic Rules/Semperis_DSP_RBAC_Changes.yaml",
        "query": "Event \n| where Source == 'Semperis-Operation-Log' and EventID == 20012 \n| order by TimeGenerated desc\n| extend p1Xml = parse_xml(EventData).DataItem.EventData.Data\n| mv-expand bagexpansion=array p1Xml\n| evaluate bag_unpack(p1Xml)\n| extend Name=column_ifexists('@Name', ''), Value=column_ifexists('#text', '')\n| extend det = column_ifexists('details', '')\n| parse det with \"Occured at (UTC): \" OccurredAt \"Session ID: \" SessionID \"Trustee Name: \" TrusteeName \"Correlation ID: \" CorrelationID \"Source: \" Source \"WebSite Target: \" WebSiteTarget \"Product: \" Product \"Component: \" Component \"AD Information: \" ADInformation \"Object GUID: \" ObjectGUID \"Attribute: \" Attribute \"Distinguished Name: \" DistinguishedName \"Additional Information: \"AdditionalInformation \"Operation Detail: \" OperationDetail \"operationName: \" operationName \"trustee: \" trustee \"personas: \" personas \"Status: \" status \"Granted: \" Granted \"Result: \" Result\n| extend _AccessGranted = iif(operationName contains \"CreateRbacIdentity\", \"Added\", \"Removed\")\n| extend _Identity = iif(operationName contains \"CreateRbacIdentity\", trustee, tostring(substring(trustee, 1, strlen(trustee))))\n| extend _Identity = iif(operationName contains \"CreateRbacIdentity\", _Identity, replace_string(_Identity, \"'\", \"\"))\n| extend add_personas = replace_string(replace_string(replace_string(personas, \"{ Name = \", \"\"), \" }\", \"\"), \";\", \",\")\n| extend remove_personas = replace_string(personas, \";\", \",\")\n| extend grid_personas = iif(operationName contains \"CreateRbacIdentity\", add_personas, remove_personas)\n| extend date_to_sort = format_datetime(TimeGenerated, \"yyyy-mm-dd   HH:mm:ss\")\n| order by date_to_sort desc\n| extend NTDomain = tostring(split(UserName, '\\\\', 0)[0]), LoginUser = tostring(split(UserName, '\\\\', 1)[0])\n| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT30M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1098",
          "T1548"
        ],
        "templateVersion": "1.1.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}