Disabling Security Services via Registry

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Id	32b29155-3fd3-4a9e-a0ca-a67e2593b60b
Rulename	Disabling Security Services via Registry
Description	This query checks for processes modifying the registry to disable security features. This is a common technique used by threat actors for defence evasion.
Severity	Medium
Tactics	DefenseEvasion
Techniques	T1562
Required data connectors	MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/Ransomware/DEV-0270/DisableSecurityServiceViaRegistry.yaml
Version	1.0.0
Arm template	32b29155-3fd3-4a9e-a0ca-a67e2593b60b.json

KQL

DeviceProcessEvents
| where InitiatingProcessCommandLine has_all(@'"reg"', 'add', @'"HKLM\SOFTWARE\Policies\', '/v','/t', 'REG_DWORD', '/d', '/f')
  and InitiatingProcessCommandLine has_any('DisableRealtimeMonitoring', 'UseTPMKey', 'UseTPMKeyPIN', 'UseAdvancedStartup', 
  'EnableBDEWithNoTPM', 'RecoveryKeyMessageSource')
| extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)
| extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), "")

YAML

severity: Medium
relevantTechniques:
- T1562
queryFrequency: 1h
kind: Scheduled
version: 1.0.0
name: Disabling Security Services via Registry
triggerOperator: gt
description: |
    This query checks for processes modifying the registry to disable security features. This is a common technique used by threat actors for defence evasion.
queryPeriod: 1h
query: |
  DeviceProcessEvents
  | where InitiatingProcessCommandLine has_all(@'"reg"', 'add', @'"HKLM\SOFTWARE\Policies\', '/v','/t', 'REG_DWORD', '/d', '/f')
    and InitiatingProcessCommandLine has_any('DisableRealtimeMonitoring', 'UseTPMKey', 'UseTPMKeyPIN', 'UseAdvancedStartup', 
    'EnableBDEWithNoTPM', 'RecoveryKeyMessageSource')
  | extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)
  | extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), "")  
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
- entityType: Account
  fieldMappings:
  - columnName: AccountUpn
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountDomain
    identifier: NTDomain
- entityType: Process
  fieldMappings:
  - columnName: ProcessId
    identifier: ProcessId
  - columnName: ProcessCommandLine
    identifier: CommandLine
tactics:
- DefenseEvasion
status: Available
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/Ransomware/DEV-0270/DisableSecurityServiceViaRegistry.yaml
id: 32b29155-3fd3-4a9e-a0ca-a67e2593b60b
requiredDataConnectors:
- dataTypes:
  - DeviceProcessEvents
  connectorId: MicrosoftThreatProtection

ARM

{
  "$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/32b29155-3fd3-4a9e-a0ca-a67e2593b60b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/32b29155-3fd3-4a9e-a0ca-a67e2593b60b')]",
      "properties": {
        "alertRuleTemplateName": "32b29155-3fd3-4a9e-a0ca-a67e2593b60b",
        "customDetails": null,
        "description": "This query checks for processes modifying the registry to disable security features. This is a common technique used by threat actors for defence evasion.\n",
        "displayName": "Disabling Security Services via Registry",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountUpn",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "ProcessId",
                "identifier": "ProcessId"
              },
              {
                "columnName": "ProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/Ransomware/DEV-0270/DisableSecurityServiceViaRegistry.yaml",
        "query": "DeviceProcessEvents\n| where InitiatingProcessCommandLine has_all(@'\"reg\"', 'add', @'\"HKLM\\SOFTWARE\\Policies\\', '/v','/t', 'REG_DWORD', '/d', '/f')\n  and InitiatingProcessCommandLine has_any('DisableRealtimeMonitoring', 'UseTPMKey', 'UseTPMKeyPIN', 'UseAdvancedStartup', \n  'EnableBDEWithNoTPM', 'RecoveryKeyMessageSource')\n| extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)\n| extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), \"\")\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1562"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}