Certified Pre-Owned - TGTs requested with certificate authentication

let timeframe=1h;
SecurityEvent
| where TimeGenerated >= ago(timeframe)
| where EventID == 4768
| project TimeGenerated, Computer, TargetAccount, EventData=parse_xml(EventData)
| mv-apply d=EventData.EventData.Data on
(
  where d["@Name"]=="CertIssuerName"
  | project CIN=tostring(d["#text"])
)
| where not(isempty(CIN))
// <DECISION - 1>
// In some environments, we see a lot of certs starting with a sid and containing live.com. Comment out the next line if you have that as well.
//| where not(CIN startswith "S-1-")
// <DECISION - 2>
// If you're seeing a significant number of machine accounts, it might be due to 802.1X or SCCM. https://twitter.com/MagnusMOD/status/1407800853088591872?s=20.
// The following line allows you to filter out all endpoints. This does introduce a blindspot, and you need a custom function which provides data about (on-prem) AD machines.
// Alternatively, you can use DeviceInfo, if you're ingesting that data from MDE.
| parse CIN with "CN=" MachineName
//| join kind=leftouter  MyCustomLookupFunction on $left.MachineName == $right.CN
//| where not(OperatingSystem startswith "Windows 10")

id: b838a13c-052e-45b8-a5ac-7d3eb62efa11
severity: Medium
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic%20Rules/CertifiedPreOwned-TGTs-requested.yaml
kind: Scheduled
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
triggerThreshold: 0
status: Available
relevantTechniques:
- T1036
entityMappings:
- fieldMappings:
  - columnName: TargetAccount
    identifier: FullName
  entityType: Account
name: Certified Pre-Owned - TGTs requested with certificate authentication
query: |
  let timeframe=1h;
  SecurityEvent
  | where TimeGenerated >= ago(timeframe)
  | where EventID == 4768
  | project TimeGenerated, Computer, TargetAccount, EventData=parse_xml(EventData)
  | mv-apply d=EventData.EventData.Data on
  (
    where d["@Name"]=="CertIssuerName"
    | project CIN=tostring(d["#text"])
  )
  | where not(isempty(CIN))
  // <DECISION - 1>
  // In some environments, we see a lot of certs starting with a sid and containing live.com. Comment out the next line if you have that as well.
  //| where not(CIN startswith "S-1-")
  // <DECISION - 2>
  // If you're seeing a significant number of machine accounts, it might be due to 802.1X or SCCM. https://twitter.com/MagnusMOD/status/1407800853088591872?s=20.
  // The following line allows you to filter out all endpoints. This does introduce a blindspot, and you need a custom function which provides data about (on-prem) AD machines.
  // Alternatively, you can use DeviceInfo, if you're ingesting that data from MDE.
  | parse CIN with "CN=" MachineName
  //| join kind=leftouter  MyCustomLookupFunction on $left.MachineName == $right.CN
  //| where not(OperatingSystem startswith "Windows 10")
queryFrequency: 1h
version: 1.0.1
description: |
  This query identifies someone using machine certificates to request Kerberos Ticket Granting Tickets (TGTs).
tactics:
- DefenseEvasion
triggerOperator: gt

{
  "$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/b838a13c-052e-45b8-a5ac-7d3eb62efa11')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b838a13c-052e-45b8-a5ac-7d3eb62efa11')]",
      "properties": {
        "alertRuleTemplateName": "b838a13c-052e-45b8-a5ac-7d3eb62efa11",
        "customDetails": null,
        "description": "This query identifies someone using machine certificates to request Kerberos Ticket Granting Tickets (TGTs).\n",
        "displayName": "Certified Pre-Owned - TGTs requested with certificate authentication",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "TargetAccount",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic%20Rules/CertifiedPreOwned-TGTs-requested.yaml",
        "query": "let timeframe=1h;\nSecurityEvent\n| where TimeGenerated >= ago(timeframe)\n| where EventID == 4768\n| project TimeGenerated, Computer, TargetAccount, EventData=parse_xml(EventData)\n| mv-apply d=EventData.EventData.Data on\n(\n  where d[\"@Name\"]==\"CertIssuerName\"\n  | project CIN=tostring(d[\"#text\"])\n)\n| where not(isempty(CIN))\n// <DECISION - 1>\n// In some environments, we see a lot of certs starting with a sid and containing live.com. Comment out the next line if you have that as well.\n//| where not(CIN startswith \"S-1-\")\n// <DECISION - 2>\n// If you're seeing a significant number of machine accounts, it might be due to 802.1X or SCCM. https://twitter.com/MagnusMOD/status/1407800853088591872?s=20.\n// The following line allows you to filter out all endpoints. This does introduce a blindspot, and you need a custom function which provides data about (on-prem) AD machines.\n// Alternatively, you can use DeviceInfo, if you're ingesting that data from MDE.\n| parse CIN with \"CN=\" MachineName\n//| join kind=leftouter  MyCustomLookupFunction on $left.MachineName == $right.CN\n//| where not(OperatingSystem startswith \"Windows 10\")\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1036"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}