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

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.
kind: Scheduled
tactics:
- DefenseEvasion
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceProcessEvents
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/Ransomware/DEV-0270/DisableSecurityServiceViaRegistry.yaml
severity: Medium
name: Disabling Security Services via Registry
triggerThreshold: 0
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), "")  
relevantTechniques:
- T1562
id: 32b29155-3fd3-4a9e-a0ca-a67e2593b60b
queryFrequency: 1h
status: Available
triggerOperator: gt
version: 1.0.0
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

ARM