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DSRM Account Abuse

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Id979c42dd-533e-4ede-b18b-31a84ba8b3d6
RulenameDSRM Account Abuse
DescriptionThis query detects an abuse of the DSRM account in order to maintain persistence and access to the organization’s Active Directory.

Ref: https://adsecurity.org/?p=1785
SeverityHigh
TacticsPersistence
TechniquesT1098
Required data connectorsSecurityEvents
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/DSRMAccountAbuse.yaml
Version1.0.3
Arm template979c42dd-533e-4ede-b18b-31a84ba8b3d6.json
Deploy To Azure
Event
| where EventLog == "Microsoft-Windows-Sysmon/Operational" and EventID in (13)
| parse EventData with * 'ProcessId">' ProcessId "<"* 'Image">' Image "<" * 'TargetObject">' TargetObject "<" * 'Details">' Details "<" * 'User">' User "<" * 
| where TargetObject has ("HKLM\\System\\CurrentControlSet\\Control\\Lsa\\DsrmAdminLogonBehavior") and Details == "DWORD (0x00000002)"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, User, ProcessId, Image, TargetObject, Details, _ResourceId
| extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
| extend AccountName = tostring(split(User, "\\")[1]), AccountNTDomain = tostring(split(User, "\\")[0])
| extend ImageFileName = tostring(split(Image, "\\")[-1])
| extend ImageDirectory = replace_string(Image, ImageFileName, "")
| project-away DomainIndex
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1098
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/DSRMAccountAbuse.yaml
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
queryPeriod: 1h
tactics:
- Persistence
severity: High
triggerOperator: gt
description: |
  'This query detects an abuse of the DSRM account in order to maintain persistence and access to the organization's Active Directory.
  Ref: https://adsecurity.org/?p=1785'  
query: |
  Event
  | where EventLog == "Microsoft-Windows-Sysmon/Operational" and EventID in (13)
  | parse EventData with * 'ProcessId">' ProcessId "<"* 'Image">' Image "<" * 'TargetObject">' TargetObject "<" * 'Details">' Details "<" * 'User">' User "<" * 
  | where TargetObject has ("HKLM\\System\\CurrentControlSet\\Control\\Lsa\\DsrmAdminLogonBehavior") and Details == "DWORD (0x00000002)"
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, User, ProcessId, Image, TargetObject, Details, _ResourceId
  | extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
  | extend AccountName = tostring(split(User, "\\")[1]), AccountNTDomain = tostring(split(User, "\\")[0])
  | extend ImageFileName = tostring(split(Image, "\\")[-1])
  | extend ImageDirectory = replace_string(Image, ImageFileName, "")
  | project-away DomainIndex  
name: DSRM Account Abuse
version: 1.0.3
metadata:
  support:
    tier: Community
  categories:
    domains:
    - Security - Others
  author:
    name: Vasileios Paschalidis
  source:
    kind: Community
id: 979c42dd-533e-4ede-b18b-31a84ba8b3d6
queryFrequency: 1h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: Computer
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: HostNameDomain
    identifier: DnsDomain
- entityType: Account
  fieldMappings:
  - columnName: User
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountNTDomain
    identifier: NTDomain
- entityType: Process
  fieldMappings:
  - columnName: ProcessId
    identifier: ProcessId
- entityType: File
  fieldMappings:
  - columnName: ImageFileName
    identifier: Name
  - columnName: ImageDirectory
    identifier: Directory
- entityType: RegistryKey
  fieldMappings:
  - columnName: TargetObject
    identifier: Key
{
  "$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/979c42dd-533e-4ede-b18b-31a84ba8b3d6')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/979c42dd-533e-4ede-b18b-31a84ba8b3d6')]",
      "properties": {
        "alertRuleTemplateName": "979c42dd-533e-4ede-b18b-31a84ba8b3d6",
        "customDetails": null,
        "description": "'This query detects an abuse of the DSRM account in order to maintain persistence and access to the organization's Active Directory.\nRef: https://adsecurity.org/?p=1785'\n",
        "displayName": "DSRM Account Abuse",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "HostNameDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "User",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountNTDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "ProcessId",
                "identifier": "ProcessId"
              }
            ]
          },
          {
            "entityType": "File",
            "fieldMappings": [
              {
                "columnName": "ImageFileName",
                "identifier": "Name"
              },
              {
                "columnName": "ImageDirectory",
                "identifier": "Directory"
              }
            ]
          },
          {
            "entityType": "RegistryKey",
            "fieldMappings": [
              {
                "columnName": "TargetObject",
                "identifier": "Key"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/DSRMAccountAbuse.yaml",
        "query": "Event\n| where EventLog == \"Microsoft-Windows-Sysmon/Operational\" and EventID in (13)\n| parse EventData with * 'ProcessId\">' ProcessId \"<\"* 'Image\">' Image \"<\" * 'TargetObject\">' TargetObject \"<\" * 'Details\">' Details \"<\" * 'User\">' User \"<\" * \n| where TargetObject has (\"HKLM\\\\System\\\\CurrentControlSet\\\\Control\\\\Lsa\\\\DsrmAdminLogonBehavior\") and Details == \"DWORD (0x00000002)\"\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, User, ProcessId, Image, TargetObject, Details, _ResourceId\n| extend HostName = tostring(split(Computer, \".\")[0]), DomainIndex = toint(indexof(Computer, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)\n| extend AccountName = tostring(split(User, \"\\\\\")[1]), AccountNTDomain = tostring(split(User, \"\\\\\")[0])\n| extend ImageFileName = tostring(split(Image, \"\\\\\")[-1])\n| extend ImageDirectory = replace_string(Image, ImageFileName, \"\")\n| project-away DomainIndex\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}