Silverfort - NTDSdit extraction | Microsoft Sentinel Analytic Rules

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Id	cc110738-a263-5cfa-ac76-a991f3e3a2df
Rulename	Silverfort - NTDS.dit extraction
Description	Identifies Silverfort incidents involving potential extraction of the NTDS.dit Active Directory database. Access to this database may expose domain account password hashes for credential theft.
Severity	High
Tactics	CredentialAccess
Techniques	T1003.003
Required data connectors	SilverfortAma
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic%20Rules/NtdsDitDump.yaml
Version	1.0.0
Arm template	cc110738-a263-5cfa-ac76-a991f3e3a2df.json

KQL

CommonSecurityLog
| where DeviceVendor has 'Silverfort'
| where DeviceProduct has 'Admin Console'
| where DeviceEventClassID == "NewIncident"
| where Message has "NtdsDitDump"
| extend IncidentData = parse_json(replace('^""|""$', '', Message))
| extend IncidentKind = coalesce(tostring(IncidentData.data.kind), tostring(IncidentData.kind))
| extend IncidentId = tostring(coalesce(IncidentData.data.id, IncidentData.id))
| extend IncidentSummary = tostring(coalesce(IncidentData.data.summary, IncidentData.summary))
| extend UserName = coalesce(
    tostring(IncidentData.data.users[0].samAccountName),
    tostring(IncidentData.data.users[0].upn),
    tostring(IncidentData.data.users[0].displayName),
    tostring(IncidentData.users[0].displayName)
)
| extend SourceHost = coalesce(
    tostring(IncidentData.data.sources[0].displayName),
    tostring(IncidentData.sources[0].displayName)
)
| extend DestinationHost = coalesce(
    tostring(IncidentData.data.destinations[0].displayName),
    tostring(IncidentData.destinations[0].displayName)
)

YAML

triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic%20Rules/NtdsDitDump.yaml
status: Available
query: |-
  CommonSecurityLog
  | where DeviceVendor has 'Silverfort'
  | where DeviceProduct has 'Admin Console'
  | where DeviceEventClassID == "NewIncident"
  | where Message has "NtdsDitDump"
  | extend IncidentData = parse_json(replace('^""|""$', '', Message))
  | extend IncidentKind = coalesce(tostring(IncidentData.data.kind), tostring(IncidentData.kind))
  | extend IncidentId = tostring(coalesce(IncidentData.data.id, IncidentData.id))
  | extend IncidentSummary = tostring(coalesce(IncidentData.data.summary, IncidentData.summary))
  | extend UserName = coalesce(
      tostring(IncidentData.data.users[0].samAccountName),
      tostring(IncidentData.data.users[0].upn),
      tostring(IncidentData.data.users[0].displayName),
      tostring(IncidentData.users[0].displayName)
  )
  | extend SourceHost = coalesce(
      tostring(IncidentData.data.sources[0].displayName),
      tostring(IncidentData.sources[0].displayName)
  )
  | extend DestinationHost = coalesce(
      tostring(IncidentData.data.destinations[0].displayName),
      tostring(IncidentData.destinations[0].displayName)
  )
kind: Scheduled
relevantTechniques:
- T1003.003
version: 1.0.0
tactics:
- CredentialAccess
id: cc110738-a263-5cfa-ac76-a991f3e3a2df
queryPeriod: 15m
queryFrequency: 15m
severity: High
name: Silverfort - NTDS.dit extraction
customDetails:
  IncidentReference: IncidentId
  IncidentSummary: IncidentSummary
  IncidentKind: IncidentKind
requiredDataConnectors:
- connectorId: SilverfortAma
  dataTypes:
  - CommonSecurityLog
description: |
  Identifies Silverfort incidents involving potential extraction of the NTDS.dit Active Directory database. Access to this database may expose domain account password hashes for credential theft.
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: UserName
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: SourceHost
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: DestinationHost
triggerThreshold: 0

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/cc110738-a263-5cfa-ac76-a991f3e3a2df')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/cc110738-a263-5cfa-ac76-a991f3e3a2df')]",
      "properties": {
        "alertRuleTemplateName": "cc110738-a263-5cfa-ac76-a991f3e3a2df",
        "customDetails": {
          "IncidentKind": "IncidentKind",
          "IncidentReference": "IncidentId",
          "IncidentSummary": "IncidentSummary"
        },
        "description": "Identifies Silverfort incidents involving potential extraction of the NTDS.dit Active Directory database. Access to this database may expose domain account password hashes for credential theft.\n",
        "displayName": "Silverfort - NTDS.dit extraction",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserName",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "SourceHost",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DestinationHost",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic%20Rules/NtdsDitDump.yaml",
        "query": "CommonSecurityLog\n| where DeviceVendor has 'Silverfort'\n| where DeviceProduct has 'Admin Console'\n| where DeviceEventClassID == \"NewIncident\"\n| where Message has \"NtdsDitDump\"\n| extend IncidentData = parse_json(replace('^\"\"|\"\"$', '', Message))\n| extend IncidentKind = coalesce(tostring(IncidentData.data.kind), tostring(IncidentData.kind))\n| extend IncidentId = tostring(coalesce(IncidentData.data.id, IncidentData.id))\n| extend IncidentSummary = tostring(coalesce(IncidentData.data.summary, IncidentData.summary))\n| extend UserName = coalesce(\n    tostring(IncidentData.data.users[0].samAccountName),\n    tostring(IncidentData.data.users[0].upn),\n    tostring(IncidentData.data.users[0].displayName),\n    tostring(IncidentData.users[0].displayName)\n)\n| extend SourceHost = coalesce(\n    tostring(IncidentData.data.sources[0].displayName),\n    tostring(IncidentData.sources[0].displayName)\n)\n| extend DestinationHost = coalesce(\n    tostring(IncidentData.data.destinations[0].displayName),\n    tostring(IncidentData.destinations[0].displayName)\n)",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1003.003"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1003"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}