Decoy User Account Authentication Attempt

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Id	a4dbc292-87eb-11ec-a8a3-0242ac120002
Rulename	Decoy User Account Authentication Attempt
Description	The query detects authentication attempts from a decoy user account. A decoy user account is explicitly created and monitored to alert the SOC, indicating a malicious activity when the account is in use. Ref: https://fidelissecurity.com/threatgeek/deception/best-deception-protection-for-active-directory
Tactics	LateralMovement
Techniques	T1021
Required data connectors	SecurityEvents WindowsSecurityEvents
Kind	Scheduled
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Windows Security Events/Hunting Queries/DecoyUserAccountAuthenticationAttempt.yaml
Version	2.0.1
Arm template	a4dbc292-87eb-11ec-a8a3-0242ac120002.json

KQL

// Enter a reference list of decoy users (usernames) "Case Sensitive"
   let DecoyUserNameList = dynamic (["DecoyUser1","DecoyUser2"]);
SecurityEvent
 | where TargetUserName in (DecoyUserNameList)
 | where EventID in (4624,4625)
 | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, TargetUserName, LogonTypeName, IpAddress

YAML

description: |
  'The query detects authentication attempts from a decoy user account. 
  A decoy user account is explicitly created and monitored to alert the SOC, indicating a malicious activity when the account is in use.
  Ref: https://fidelissecurity.com/threatgeek/deception/best-deception-protection-for-active-directory'  
requiredDataConnectors:
- connectorId: SecurityEvents
  dataTypes:
  - SecurityEvent
- connectorId: WindowsSecurityEvents
  dataTypes:
  - SecurityEvent
relevantTechniques:
- T1021
name: Decoy User Account Authentication Attempt
version: 2.0.1
kind: Scheduled
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: TargetUserName
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: Computer
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IpAddress
query: |
  // Enter a reference list of decoy users (usernames) "Case Sensitive"
     let DecoyUserNameList = dynamic (["DecoyUser1","DecoyUser2"]);
  SecurityEvent
   | where TargetUserName in (DecoyUserNameList)
   | where EventID in (4624,4625)
   | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, TargetUserName, LogonTypeName, IpAddress  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Windows Security Events/Hunting Queries/DecoyUserAccountAuthenticationAttempt.yaml
id: a4dbc292-87eb-11ec-a8a3-0242ac120002
tactics:
- LateralMovement

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/a4dbc292-87eb-11ec-a8a3-0242ac120002')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a4dbc292-87eb-11ec-a8a3-0242ac120002')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Decoy User Account Authentication Attempt",
        "description": "'The query detects authentication attempts from a decoy user account. \nA decoy user account is explicitly created and monitored to alert the SOC, indicating a malicious activity when the account is in use.\nRef: https://fidelissecurity.com/threatgeek/deception/best-deception-protection-for-active-directory'\n",
        "enabled": true,
        "query": "// Enter a reference list of decoy users (usernames) \"Case Sensitive\"\n   let DecoyUserNameList = dynamic ([\"DecoyUser1\",\"DecoyUser2\"]);\nSecurityEvent\n | where TargetUserName in (DecoyUserNameList)\n | where EventID in (4624,4625)\n | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, TargetUserName, LogonTypeName, IpAddress\n",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "LateralMovement"
        ],
        "techniques": [
          "T1021"
        ],
        "alertRuleTemplateName": "a4dbc292-87eb-11ec-a8a3-0242ac120002",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "TargetUserName",
                "identifier": "Name"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "HostName"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "columnName": "IpAddress",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "templateVersion": "2.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Windows Security Events/Hunting Queries/DecoyUserAccountAuthenticationAttempt.yaml"
      }
    }
  ]
}