Detect Registry Run Key CreationModification

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Id	dd041e4e-1ee2-41ec-ba4e-82a71d628260
Rulename	Detect Registry Run Key Creation/Modification
Description	This analytic rule detects any registry value or key creation in the registry run keys. This could be an indication of a persistence attempt by an adversary.
Severity	Medium
Tactics	Persistence PrivilegeEscalation DefenseEvasion
Techniques	T1547 T1112
Required data connectors	CiscoSecureEndpoint CrowdStrikeFalconEndpointProtection MicrosoftThreatProtection SentinelOne TrendMicroApexOne TrendMicroApexOneAma VMwareCarbonBlack
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/Malware Protection Essentials/Analytic Rules/StartupRegistryModified.yaml
Version	1.0.0
Arm template	dd041e4e-1ee2-41ec-ba4e-82a71d628260.json

KQL

// List of startup registry keys to monitor
let startupRegistryList = dynamic([
    'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Run',
    'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnceEx',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServicesOnce',
    'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServicesOnce',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServices',
    'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServices',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run',
    'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Userinit',
    'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell',
    'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Windows'
  ]);
_ASim_RegistryEvent
| where EventType in ('RegistryValueSet', 'RegistryKeyCreated') and RegistryKey has_any (startupRegistryList)
| project
    TimeGenerated,
    DvcHostname,
    ActorUsername,
    ActorUsernameType,
    ActingProcessId,
    ActingProcessName,
    ActingProcessCommandLine,
    RegistryKey,
    RegistryValue,
    RegistryValueType,
    RegistryValueData
| extend HostName = tostring(split(DvcHostname, '.')[0])
| extend DnsDomain = tostring(strcat_array(array_slice(split(DvcHostname, '.'), 1, -1), '.'))
| extend Username = iff(tostring(ActorUsernameType) == 'Windows', tostring(split(ActorUsername, '\\')[1]), ActorUsername)
| extend NTDomain = iff(tostring(ActorUsernameType) == 'Windows', tostring(split(ActorUsername, '\\')[0]), ActorUsername)
| extend Username = iff(tostring(ActorUsernameType) == 'UPN', tostring(split(ActorUsername, '@')[0]), Username)
| extend UPNSuffix = iff(tostring(ActorUsernameType) == 'UPN', tostring(split(ActorUsername, '@')[1]), '')
| extend RegHive = tostring(split(RegistryKey, '\\')[0]), RegKey = tostring(strcat_array(array_slice(split(RegistryKey, '\\'), 1, -1), '\\'))

YAML

relevantTechniques:
- T1547
- T1112
entityMappings:
- fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
  - columnName: NTDomain
    identifier: NTDomain
  entityType: Host
- fieldMappings:
  - columnName: Username
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  - columnName: NTDomain
    identifier: NTDomain
  entityType: Account
- fieldMappings:
  - columnName: ActingProcessId
    identifier: ProcessId
  - columnName: ActingProcessCommandLine
    identifier: CommandLine
  entityType: Process
- fieldMappings:
  - columnName: RegHive
    identifier: Hive
  - columnName: RegKey
    identifier: Key
  entityType: RegistryKey
- fieldMappings:
  - columnName: RegistryValue
    identifier: Name
  - columnName: RegistryValueData
    identifier: Value
  - columnName: RegistryValueType
    identifier: ValueType
  entityType: RegistryValue
version: 1.0.0
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/StartupRegistryModified.yaml
description: |
    This analytic rule detects any registry value or key creation in the registry run keys. This could be an indication of a persistence attempt by an adversary.
requiredDataConnectors:
- connectorId: CrowdStrikeFalconEndpointProtection
  dataTypes:
  - CommonSecurityLog
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - SecurityAlert
- connectorId: SentinelOne
  dataTypes:
  - SentinelOne_CL
- connectorId: VMwareCarbonBlack
  dataTypes:
  - CarbonBlackEvents_CL
- connectorId: CiscoSecureEndpoint
  dataTypes:
  - CiscoSecureEndpoint_CL
- connectorId: TrendMicroApexOne
  dataTypes:
  - TMApexOneEvent
- connectorId: TrendMicroApexOneAma
  dataTypes:
  - TMApexOneEvent
triggerOperator: gt
alertDetailsOverride:
  alertDisplayNameFormat: Registry Run Keys Modified on {{DvcHostname}} ({{DvcIpAddr}}) by ({{ActorUsername}})
  alertDescriptionFormat: 'Process {{ActingProcessName}} ProcessId: ({{ActingProcessId}}) modified registry run key {{RegistryKey}}.'
eventGroupingSettings:
  aggregationKind: SingleAlert
id: dd041e4e-1ee2-41ec-ba4e-82a71d628260
queryFrequency: 1h
query: |
  // List of startup registry keys to monitor
  let startupRegistryList = dynamic([
      'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Run',
      'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnceEx',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServicesOnce',
      'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServicesOnce',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServices',
      'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServices',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run',
      'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Userinit',
      'HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell',
      'HKEY_CURRENT_USER\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Windows'
    ]);
  _ASim_RegistryEvent
  | where EventType in ('RegistryValueSet', 'RegistryKeyCreated') and RegistryKey has_any (startupRegistryList)
  | project
      TimeGenerated,
      DvcHostname,
      ActorUsername,
      ActorUsernameType,
      ActingProcessId,
      ActingProcessName,
      ActingProcessCommandLine,
      RegistryKey,
      RegistryValue,
      RegistryValueType,
      RegistryValueData
  | extend HostName = tostring(split(DvcHostname, '.')[0])
  | extend DnsDomain = tostring(strcat_array(array_slice(split(DvcHostname, '.'), 1, -1), '.'))
  | extend Username = iff(tostring(ActorUsernameType) == 'Windows', tostring(split(ActorUsername, '\\')[1]), ActorUsername)
  | extend NTDomain = iff(tostring(ActorUsernameType) == 'Windows', tostring(split(ActorUsername, '\\')[0]), ActorUsername)
  | extend Username = iff(tostring(ActorUsernameType) == 'UPN', tostring(split(ActorUsername, '@')[0]), Username)
  | extend UPNSuffix = iff(tostring(ActorUsernameType) == 'UPN', tostring(split(ActorUsername, '@')[1]), '')
  | extend RegHive = tostring(split(RegistryKey, '\\')[0]), RegKey = tostring(strcat_array(array_slice(split(RegistryKey, '\\'), 1, -1), '\\'))   
severity: Medium
kind: Scheduled
status: Available
queryPeriod: 1h
name: Detect Registry Run Key Creation/Modification
tactics:
- Persistence
- PrivilegeEscalation
- DefenseEvasion
tags:
- Schema: _ASim_RegistryEvent
  SchemaVersion: 0.1.2

ARM