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), '\\'))
queryFrequency: 1h
eventGroupingSettings:
aggregationKind: singleAlert
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
tags:
- Schema: _ASim_RegistryEvent
SchemaVersion: 0.1.2
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
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), '\\'))
entityMappings:
- entityType: Host
fieldMappings:
- identifier: HostName
columnName: HostName
- identifier: DnsDomain
columnName: DnsDomain
- identifier: NTDomain
columnName: NTDomain
- entityType: Account
fieldMappings:
- identifier: Name
columnName: Username
- identifier: UPNSuffix
columnName: UPNSuffix
- identifier: NTDomain
columnName: NTDomain
- entityType: Process
fieldMappings:
- identifier: ProcessId
columnName: ActingProcessId
- identifier: CommandLine
columnName: ActingProcessCommandLine
- entityType: RegistryKey
fieldMappings:
- identifier: Hive
columnName: RegHive
- identifier: Key
columnName: RegKey
- entityType: RegistryValue
fieldMappings:
- identifier: Name
columnName: RegistryValue
- identifier: Value
columnName: RegistryValueData
- identifier: ValueType
columnName: RegistryValueType
relevantTechniques:
- T1562
name: 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
queryPeriod: 1h
alertDetailsOverride:
alertDescriptionFormat: Windows Update Disabled from Registry {{RegKey}} on {{HostName}} by {{Username}}
alertDisplayNameFormat: Windows Update Disabled from Registry on {{HostName}}
triggerOperator: gt
kind: Scheduled
status: Available
tactics:
- DefenseEvasion
id: f1443a87-78d5-40c3-b051-f468f0f2def0
version: 1.0.0
triggerThreshold: 0
{
"$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"
}
]
}