Semperis DSP Well-known privileged SIDs in sIDHistory

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Id	ddd75d93-5b8b-4349-babe-c4e15343c5a3
Rulename	Semperis DSP Well-known privileged SIDs in sIDHistory
Description	This indicator looks for security principals that contain specific SIDs of accounts from built-in privileged groups within their sIDHistory attribute. This would allow those security principals to have the same privileges as those privileged accounts, but in a way that is not obvious to monitor (e.g. through group membership).
Severity	Medium
Tactics	PrivilegeEscalation DefenseEvasion
Techniques	T1134
Required data connectors	SemperisDSP
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Semperis Directory Services Protector/Analytic Rules/SemperisDSP_WellKnownPrivilegedSIDsInsIDHistory.yaml
Version	1.0.1
Arm template	ddd75d93-5b8b-4349-babe-c4e15343c5a3.json

KQL

dsp_parser
| where EventID == 9212
| where SecurityIndicatorName == "Well-known privileged SIDs in sIDHistory"
| 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

tactics:
- PrivilegeEscalation
- DefenseEvasion
requiredDataConnectors:
- dataTypes:
  - dsp_parser
  connectorId: SemperisDSP
status: Available
queryFrequency: 1h
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: LoginUser
    identifier: Name
  - columnName: NTDomain
    identifier: NTDomain
- entityType: Host
  fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
relevantTechniques:
- T1134
query: |
  dsp_parser
  | where EventID == 9212
  | where SecurityIndicatorName == "Well-known privileged SIDs in sIDHistory"
  | 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), '.'))  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Semperis Directory Services Protector/Analytic Rules/SemperisDSP_WellKnownPrivilegedSIDsInsIDHistory.yaml
description: |
    'This indicator looks for security principals that contain specific SIDs of accounts from built-in privileged groups within their sIDHistory attribute. This would allow those security principals to have the same privileges as those privileged accounts, but in a way that is not obvious to monitor (e.g. through group membership).'
queryPeriod: 1h
triggerOperator: gt
id: ddd75d93-5b8b-4349-babe-c4e15343c5a3
triggerThreshold: 0
severity: Medium
name: Semperis DSP Well-known privileged SIDs in sIDHistory
version: 1.0.1
kind: Scheduled

ARM

{
  "$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/ddd75d93-5b8b-4349-babe-c4e15343c5a3')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ddd75d93-5b8b-4349-babe-c4e15343c5a3')]",
      "properties": {
        "alertRuleTemplateName": "ddd75d93-5b8b-4349-babe-c4e15343c5a3",
        "customDetails": null,
        "description": "'This indicator looks for security principals that contain specific SIDs of accounts from built-in privileged groups within their sIDHistory attribute. This would allow those security principals to have the same privileges as those privileged accounts, but in a way that is not obvious to monitor (e.g. through group membership).'\n",
        "displayName": "Semperis DSP Well-known privileged SIDs in sIDHistory",
        "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"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Semperis Directory Services Protector/Analytic Rules/SemperisDSP_WellKnownPrivilegedSIDsInsIDHistory.yaml",
        "query": "dsp_parser\n| where EventID == 9212\n| where SecurityIndicatorName == \"Well-known privileged SIDs in sIDHistory\"\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": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1134"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}