Detect Windows Update Disabled from Registry
| Id | f1443a87-78d5-40c3-b051-f468f0f2def0 |
| Rulename | Detect Windows Update Disabled from Registry |
| Description | This analytic rule detects any registry value creation or modification of Windows Update registry keys to disable Windows Update. This could be an indication of defense evasion by an adversary on a compromised host. |
| Severity | Medium |
| Tactics | DefenseEvasion |
| Techniques | T1562 |
| 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/WindowsUpdateDisabled.yaml |
| Version | 1.0.0 |
| Arm template | f1443a87-78d5-40c3-b051-f468f0f2def0.json |
// List of Windows Firewall registry keys to monitor
let windowsUpdateRegistryList = dynamic([
'HKEY_LOCAL_MACHINE\\Software\\Policies\\Microsoft\\Windows\\WindowsUpdate',
'HKEY_LOCAL_MACHINE\\Software\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU'
]);
_ASim_RegistryEvent
| where EventType in ('RegistryValueSet', 'RegistryKeyCreated')
| where RegistryKey has_any (windowsUpdateRegistryList)
| where RegistryValue has_any ('AUOptions', 'NoAutoUpdate') and RegistryValueData == '1'
| 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), '\\'))
name: Detect Windows Update Disabled from Registry
relevantTechniques:
- T1562
severity: Medium
queryFrequency: 1h
triggerOperator: gt
tags:
- Schema: _ASim_RegistryEvent
SchemaVersion: 0.1.2
status: Available
description: |
This analytic rule detects any registry value creation or modification of Windows Update registry keys to disable Windows Update. This could be an indication of defense evasion by an adversary on a compromised host.
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/WindowsUpdateDisabled.yaml
alertDetailsOverride:
alertDisplayNameFormat: Windows Update Disabled from Registry on {{HostName}}
alertDescriptionFormat: Windows Update Disabled from Registry {{RegKey}} on {{HostName}} by {{Username}}
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
entityMappings:
- fieldMappings:
- identifier: HostName
columnName: HostName
- identifier: DnsDomain
columnName: DnsDomain
- identifier: NTDomain
columnName: NTDomain
entityType: Host
- fieldMappings:
- identifier: Name
columnName: Username
- identifier: UPNSuffix
columnName: UPNSuffix
- identifier: NTDomain
columnName: NTDomain
entityType: Account
- fieldMappings:
- identifier: ProcessId
columnName: ActingProcessId
- identifier: CommandLine
columnName: ActingProcessCommandLine
entityType: Process
- fieldMappings:
- identifier: Hive
columnName: RegHive
- identifier: Key
columnName: RegKey
entityType: RegistryKey
- fieldMappings:
- identifier: Name
columnName: RegistryValue
- identifier: Value
columnName: RegistryValueData
- identifier: ValueType
columnName: RegistryValueType
entityType: RegistryValue
tactics:
- DefenseEvasion
queryPeriod: 1h
query: |
// List of Windows Firewall registry keys to monitor
let windowsUpdateRegistryList = dynamic([
'HKEY_LOCAL_MACHINE\\Software\\Policies\\Microsoft\\Windows\\WindowsUpdate',
'HKEY_LOCAL_MACHINE\\Software\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU'
]);
_ASim_RegistryEvent
| where EventType in ('RegistryValueSet', 'RegistryKeyCreated')
| where RegistryKey has_any (windowsUpdateRegistryList)
| where RegistryValue has_any ('AUOptions', 'NoAutoUpdate') and RegistryValueData == '1'
| 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), '\\'))
version: 1.0.0
kind: Scheduled
eventGroupingSettings:
aggregationKind: singleAlert
triggerThreshold: 0
id: f1443a87-78d5-40c3-b051-f468f0f2def0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/f1443a87-78d5-40c3-b051-f468f0f2def0')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f1443a87-78d5-40c3-b051-f468f0f2def0')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "Windows Update Disabled from Registry {{RegKey}} on {{HostName}} by {{Username}}",
"alertDisplayNameFormat": "Windows Update Disabled from Registry on {{HostName}}"
},
"alertRuleTemplateName": "f1443a87-78d5-40c3-b051-f468f0f2def0",
"customDetails": null,
"description": "This analytic rule detects any registry value creation or modification of Windows Update registry keys to disable Windows Update. This could be an indication of defense evasion by an adversary on a compromised host.\n",
"displayName": "Detect Windows Update Disabled from Registry",
"enabled": true,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "DnsDomain",
"identifier": "DnsDomain"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Username",
"identifier": "Name"
},
{
"columnName": "UPNSuffix",
"identifier": "UPNSuffix"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Process",
"fieldMappings": [
{
"columnName": "ActingProcessId",
"identifier": "ProcessId"
},
{
"columnName": "ActingProcessCommandLine",
"identifier": "CommandLine"
}
]
},
{
"entityType": "RegistryKey",
"fieldMappings": [
{
"columnName": "RegHive",
"identifier": "Hive"
},
{
"columnName": "RegKey",
"identifier": "Key"
}
]
},
{
"entityType": "RegistryValue",
"fieldMappings": [
{
"columnName": "RegistryValue",
"identifier": "Name"
},
{
"columnName": "RegistryValueData",
"identifier": "Value"
},
{
"columnName": "RegistryValueType",
"identifier": "ValueType"
}
]
}
],
"eventGroupingSettings": {
"aggregationKind": "singleAlert"
},
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/WindowsUpdateDisabled.yaml",
"query": "// List of Windows Firewall registry keys to monitor\nlet windowsUpdateRegistryList = dynamic([\n 'HKEY_LOCAL_MACHINE\\\\Software\\\\Policies\\\\Microsoft\\\\Windows\\\\WindowsUpdate',\n 'HKEY_LOCAL_MACHINE\\\\Software\\\\Policies\\\\Microsoft\\\\Windows\\\\WindowsUpdate\\\\AU'\n ]);\n_ASim_RegistryEvent\n| where EventType in ('RegistryValueSet', 'RegistryKeyCreated') \n| where RegistryKey has_any (windowsUpdateRegistryList) \n| where RegistryValue has_any ('AUOptions', 'NoAutoUpdate') and RegistryValueData == '1'\n| project\n TimeGenerated,\n DvcHostname,\n ActorUsername,\n ActorUsernameType,\n ActingProcessId,\n ActingProcessName,\n ActingProcessCommandLine,\n RegistryKey,\n RegistryValue,\n RegistryValueType,\n RegistryValueData\n| extend HostName = tostring(split(DvcHostname, '.')[0])\n| extend DnsDomain = tostring(strcat_array(array_slice(split(DvcHostname, '.'), 1, -1), '.'))\n| extend Username = iff(tostring(ActorUsernameType) == 'Windows', tostring(split(ActorUsername, '\\\\')[1]), ActorUsername)\n| extend NTDomain = iff(tostring(ActorUsernameType) == 'Windows', tostring(split(ActorUsername, '\\\\')[0]), ActorUsername)\n| extend Username = iff(tostring(ActorUsernameType) == 'UPN', tostring(split(ActorUsername, '@')[0]), Username)\n| extend UPNSuffix = iff(tostring(ActorUsernameType) == 'UPN', tostring(split(ActorUsername, '@')[1]), '')\n| extend RegHive = tostring(split(RegistryKey, '\\\\')[0]), RegKey = tostring(strcat_array(array_slice(split(RegistryKey, '\\\\'), 1, -1), '\\\\')) \n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"DefenseEvasion"
],
"tags": [
{
"Schema": "_ASim_RegistryEvent",
"SchemaVersion": "0.1.2"
}
],
"techniques": [
"T1562"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}