Detect Print Processors Registry Driver Key CreationModification
| Id | 7edde3d4-9859-4a00-b93c-b19ddda55320 |
| Rulename | Detect Print Processors Registry Driver Key Creation/Modification |
| Description | This analytic rule detects any registry value creation or modification of print processor registry Driver key. This will load the executable at startup with print spooler service. This could be an indication of a persistence attempt by an adversary. |
| Severity | Medium |
| Tactics | Persistence PrivilegeEscalation |
| Techniques | T1547 |
| 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/PrintProcessersModified.yaml |
| Version | 1.0.0 |
| Arm template | 7edde3d4-9859-4a00-b93c-b19ddda55320.json |
// Print Processor Registry Key RegEx
let printProcessorRegistryRegEx = @'HKEY_LOCAL_MACHINE\\SYSTEM\\[A-Za-z0-9]*ControlSet[A-Za-z0-9]*\\Control\\Print\\Environments\\Windows\s[A-Za-z0-9]+\\Print Processors\\[A-Za-z0-9]+\\Driver';
_ASim_RegistryEvent
| where EventType in ('RegistryValueSet', 'RegistryKeyCreated')
| where RegistryKey matches regex printProcessorRegistryRegEx
| 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), '\\'))
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/PrintProcessersModified.yaml
status: Available
id: 7edde3d4-9859-4a00-b93c-b19ddda55320
alertDetailsOverride:
alertDescriptionFormat: 'Process {{ActingProcessName}} ProcessId: ({{ActingProcessId}}) modified registry driver key {{RegistryKey}}.'
alertDisplayNameFormat: Print Processor Registry Driver Keys Modified on {{DvcHostname}} ({{DvcIpAddr}}) by ({{ActorUsername}})
query: |
// Print Processor Registry Key RegEx
let printProcessorRegistryRegEx = @'HKEY_LOCAL_MACHINE\\SYSTEM\\[A-Za-z0-9]*ControlSet[A-Za-z0-9]*\\Control\\Print\\Environments\\Windows\s[A-Za-z0-9]+\\Print Processors\\[A-Za-z0-9]+\\Driver';
_ASim_RegistryEvent
| where EventType in ('RegistryValueSet', 'RegistryKeyCreated')
| where RegistryKey matches regex printProcessorRegistryRegEx
| 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), '\\'))
tags:
- SchemaVersion: 0.1.2
Schema: _ASim_RegistryEvent
description: |
This analytic rule detects any registry value creation or modification of print processor registry Driver key. This will load the executable at startup with print spooler service. This could be an indication of a persistence attempt by an adversary.
name: Detect Print Processors Registry Driver Key Creation/Modification
relevantTechniques:
- T1547
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
triggerThreshold: 0
severity: Medium
requiredDataConnectors:
- dataTypes:
- CommonSecurityLog
connectorId: CrowdStrikeFalconEndpointProtection
- dataTypes:
- SecurityAlert
connectorId: MicrosoftThreatProtection
- dataTypes:
- SentinelOne_CL
connectorId: SentinelOne
- dataTypes:
- CarbonBlackEvents_CL
connectorId: VMwareCarbonBlack
- dataTypes:
- CiscoSecureEndpoint_CL
connectorId: CiscoSecureEndpoint
- dataTypes:
- TMApexOneEvent
connectorId: TrendMicroApexOne
- dataTypes:
- TMApexOneEvent
connectorId: TrendMicroApexOneAma
eventGroupingSettings:
aggregationKind: SingleAlert
queryFrequency: 1h
queryPeriod: 1h
version: 1.0.0
kind: Scheduled
tactics:
- Persistence
- PrivilegeEscalation
triggerOperator: gt
{
"$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/7edde3d4-9859-4a00-b93c-b19ddda55320')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7edde3d4-9859-4a00-b93c-b19ddda55320')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "Process {{ActingProcessName}} ProcessId: ({{ActingProcessId}}) modified registry driver key {{RegistryKey}}.",
"alertDisplayNameFormat": "Print Processor Registry Driver Keys Modified on {{DvcHostname}} ({{DvcIpAddr}}) by ({{ActorUsername}})"
},
"alertRuleTemplateName": "7edde3d4-9859-4a00-b93c-b19ddda55320",
"customDetails": null,
"description": "This analytic rule detects any registry value creation or modification of print processor registry Driver key. This will load the executable at startup with print spooler service. This could be an indication of a persistence attempt by an adversary.\n",
"displayName": "Detect Print Processors Registry Driver Key Creation/Modification",
"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/PrintProcessersModified.yaml",
"query": "// Print Processor Registry Key RegEx\nlet printProcessorRegistryRegEx = @'HKEY_LOCAL_MACHINE\\\\SYSTEM\\\\[A-Za-z0-9]*ControlSet[A-Za-z0-9]*\\\\Control\\\\Print\\\\Environments\\\\Windows\\s[A-Za-z0-9]+\\\\Print Processors\\\\[A-Za-z0-9]+\\\\Driver';\n_ASim_RegistryEvent\n| where EventType in ('RegistryValueSet', 'RegistryKeyCreated')\n| where RegistryKey matches regex printProcessorRegistryRegEx\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": [
"Persistence",
"PrivilegeEscalation"
],
"tags": [
{
"Schema": "_ASim_RegistryEvent",
"SchemaVersion": "0.1.2"
}
],
"techniques": [
"T1547"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}