AD FS Abnormal EKU object identifier attribute

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Id	cfc1ae62-db63-4a3e-b88b-dc04030c2257
Rulename	AD FS Abnormal EKU object identifier attribute
Description	This detection uses Security events from the “AD FS Auditing” provider to detect suspicious object identifiers (OIDs) as part EventID 501 and specifically part of the Enhanced Key Usage attributes. This query checks to see if you have any new OIDs in the last hour that have not been seen in the previous day. New OIDs should be validated and OIDs that are very long, as indicated by the OID_Length field, could also be an indicator of malicious activity. In order to use this query you need to enable AD FS auditing on the AD FS Server. References: https://www.microsoft.com/security/blog/2022/08/24/magicweb-nobeliums-post-compromise-trick-to-authenticate-as-anyone/ https://docs.microsoft.com/windows-server/identity/ad-fs/troubleshooting/ad-fs-tshoot-logging
Severity	High
Tactics	CredentialAccess
Techniques	T1552
Required data connectors	SecurityEvents
Kind	Scheduled
Query frequency	1h
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/ADFSAbnormalEnhancedKeyUsageAttribute-OID.yaml
Version	1.0.2
Arm template	cfc1ae62-db63-4a3e-b88b-dc04030c2257.json

KQL

// change the starttime value for a longer period of known OIDs
let starttime = 1d;
// change the lookback value for a longer period of lookback for suspicious/abnormal
let lookback = 1h;
let OIDList = SecurityEvent
| where TimeGenerated >= ago(starttime)
| where EventSourceName == 'AD FS Auditing'
| where EventID == 501
| where EventData has '/eku'
| extend OIDs = extract_all(@"<Data>([\d+\.]+)</Data>", EventData)
| mv-expand OIDs
| extend OID = tostring(OIDs)
| extend OID_Length = strlen(OID)
| project TimeGenerated, Computer, EventSourceName, EventID, OID, OID_Length, EventData
;
OIDList
| where TimeGenerated >= ago(lookback)
| join kind=leftanti (
OIDList
| where TimeGenerated between (ago(starttime) .. ago(lookback))
| summarize by OID
) on OID

YAML

kind: Scheduled
metadata:
  support:
    tier: Community
  categories:
    domains:
    - Security - Others
    - Identity
  source:
    kind: Community
  author:
    name: Ajeet Prakash
severity: High
tags:
- Nobelium
- MagicWeb
name: AD FS Abnormal EKU object identifier attribute
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: Computer
    identifier: FullName
relevantTechniques:
- T1552
queryFrequency: 1h
triggerThreshold: 0
queryPeriod: 1d
description: |
  'This detection uses Security events from the "AD FS Auditing" provider to detect suspicious object identifiers (OIDs) as part EventID 501 and specifically part of the Enhanced Key Usage attributes.
  This query checks to see if you have any new OIDs in the last hour that have not been seen in the previous day. New OIDs should be validated and OIDs that are very long, as indicated
  by the OID_Length field, could also be an indicator of malicious activity.
  In order to use this query you need to enable AD FS auditing on the AD FS Server.
  References:
  https://www.microsoft.com/security/blog/2022/08/24/magicweb-nobeliums-post-compromise-trick-to-authenticate-as-anyone/
  https://docs.microsoft.com/windows-server/identity/ad-fs/troubleshooting/ad-fs-tshoot-logging
  '  
id: cfc1ae62-db63-4a3e-b88b-dc04030c2257
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/ADFSAbnormalEnhancedKeyUsageAttribute-OID.yaml
version: 1.0.2
tactics:
- CredentialAccess
query: |
  // change the starttime value for a longer period of known OIDs
  let starttime = 1d;
  // change the lookback value for a longer period of lookback for suspicious/abnormal
  let lookback = 1h;
  let OIDList = SecurityEvent
  | where TimeGenerated >= ago(starttime)
  | where EventSourceName == 'AD FS Auditing'
  | where EventID == 501
  | where EventData has '/eku'
  | extend OIDs = extract_all(@"<Data>([\d+\.]+)</Data>", EventData)
  | mv-expand OIDs
  | extend OID = tostring(OIDs)
  | extend OID_Length = strlen(OID)
  | project TimeGenerated, Computer, EventSourceName, EventID, OID, OID_Length, EventData
  ;
  OIDList
  | where TimeGenerated >= ago(lookback)
  | join kind=leftanti (
  OIDList
  | where TimeGenerated between (ago(starttime) .. ago(lookback))
  | summarize by OID
  ) on OID  
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
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": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/cfc1ae62-db63-4a3e-b88b-dc04030c2257')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/cfc1ae62-db63-4a3e-b88b-dc04030c2257')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "AD FS Abnormal EKU object identifier attribute",
        "description": "'This detection uses Security events from the \"AD FS Auditing\" provider to detect suspicious object identifiers (OIDs) as part EventID 501 and specifically part of the Enhanced Key Usage attributes.\nThis query checks to see if you have any new OIDs in the last hour that have not been seen in the previous day. New OIDs should be validated and OIDs that are very long, as indicated\nby the OID_Length field, could also be an indicator of malicious activity.\nIn order to use this query you need to enable AD FS auditing on the AD FS Server.\nReferences:\nhttps://www.microsoft.com/security/blog/2022/08/24/magicweb-nobeliums-post-compromise-trick-to-authenticate-as-anyone/\nhttps://docs.microsoft.com/windows-server/identity/ad-fs/troubleshooting/ad-fs-tshoot-logging\n'\n",
        "severity": "High",
        "enabled": true,
        "query": "// change the starttime value for a longer period of known OIDs\nlet starttime = 1d;\n// change the lookback value for a longer period of lookback for suspicious/abnormal\nlet lookback = 1h;\nlet OIDList = SecurityEvent\n| where TimeGenerated >= ago(starttime)\n| where EventSourceName == 'AD FS Auditing'\n| where EventID == 501\n| where EventData has '/eku'\n| extend OIDs = extract_all(@\"<Data>([\\d+\\.]+)</Data>\", EventData)\n| mv-expand OIDs\n| extend OID = tostring(OIDs)\n| extend OID_Length = strlen(OID)\n| project TimeGenerated, Computer, EventSourceName, EventID, OID, OID_Length, EventData\n;\nOIDList\n| where TimeGenerated >= ago(lookback)\n| join kind=leftanti (\nOIDList\n| where TimeGenerated between (ago(starttime) .. ago(lookback))\n| summarize by OID\n) on OID\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1552"
        ],
        "alertRuleTemplateName": "cfc1ae62-db63-4a3e-b88b-dc04030c2257",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "Computer"
              }
            ]
          }
        ],
        "templateVersion": "1.0.2",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/ADFSAbnormalEnhancedKeyUsageAttribute-OID.yaml",
        "tags": [
          "Nobelium",
          "MagicWeb"
        ]
      }
    }
  ]
}