Analytic rule catalog
PROD TM0101 - BITLOCKER - Stored Bitlocker Recovery Key to Tier Level Computer Object
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| Id | eea9c640-afe0-4ce4-9a41-c409d4c2c924 |
| Rulename | PROD (TM010.1) - BITLOCKER - Stored Bitlocker Recovery Key to Tier Level Computer Object |
| Description | A Bitlocker recovery key was stored within a Tier Model computer object. |
| Severity | Informational |
| Tactics | CredentialAccess |
| Techniques | T1552.004 |
| Required data connectors | SecurityEvents WindowsSecurityEvents |
| Kind | Scheduled |
| Query frequency | 5h |
| Query period | 5h |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Active%20Directory%20Tier%20Model/Analytic%20Rules/TM010_BITLOCKERStoredBitlockerRecoveryKeyToTierLevelComputerObject.yaml |
| Version | 1.0.0 |
| Arm template | eea9c640-afe0-4ce4-9a41-c409d4c2c924.json |
SecurityEvent
| where EventID == 5137
and (EventData matches regex @"(?i)OU=Domain Controllers"
or EventData matches regex @"(?i)OU=Tier 0 PAW"
or EventData matches regex @"(?i)OU=Tier 1 PAW"
or EventData matches regex @"(?i)OU=Tier 2 PAW"
or EventData matches regex @"(?i)OU=Tier 0 Member Servers"
or EventData matches regex @"(?i)OU=Tier 1 Member Servers")
| extend ObjectClass = extract("<Data Name=\"ObjectClass\">([^<]+)</Data>", 1, EventData)
| where ObjectClass has "msFVE-RecoveryInformation"
| extend ObjectBitName_e = extract("<Data Name=\"ObjectDN\">([^<]+)</Data>", 1, EventData)
| extend ObjectFullName = extract("(?i)(CN=[^,]+,(?i)OU=[^,]+)", 1, ObjectBitName_e)
| extend ObjectName = extract("(?i)CN=([^,]+)", 1, ObjectFullName)
| extend ObjectTier = case(
ObjectFullName has "Tier 0", "Tier 0",
ObjectFullName has "Tier 1", "Tier 1",
ObjectFullName has "Tier Model Administration", "Tier 0",
ObjectFullName has "Tier Model Computer Quarantine", "Tier 0",
ObjectFullName has "Domain Controllers", "Tier 0",
"Unknown")
| extend ActivityType = extract("([a-zA-Z]+)\\.$", 1, Activity)
| extend Domain = extract("([^.]+\\.[^.]+)$", 1, Computer)
| project TimeGenerated
, ObjectName
, ObjectTier
, ObjectClass
, ActivityType
, Account
, Domain
, Computer
, Channel
, EventID
, EventData
incidentConfiguration:
groupingConfiguration:
matchingMethod: AllEntities
enabled: false
lookbackDuration: PT5H
reopenClosedIncident: false
createIncident: true
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Active%20Directory%20Tier%20Model/Analytic%20Rules/TM010_BITLOCKERStoredBitlockerRecoveryKeyToTierLevelComputerObject.yaml
triggerThreshold: 0
id: eea9c640-afe0-4ce4-9a41-c409d4c2c924
kind: Scheduled
relevantTechniques:
- T1552.004
version: 1.0.0
tactics:
- CredentialAccess
queryPeriod: 5h
queryFrequency: 5h
alertDetailsOverride:
alertDescriptionFormat: A Tier Model object Bitlocker Key was stored in AD. This Informational alert is generated as part of reporting.
alertDisplayNameFormat: (TM010.1) A {{ObjectTier}} Bitlocker Recovery Key was stored in AD
severity: Informational
name: PROD (TM010.1) - BITLOCKER - Stored Bitlocker Recovery Key to Tier Level Computer Object
customDetails:
ObjectName: ObjectName
ObjectClass: ObjectClass
ObjectTier: ObjectTier
EventID: EventID
Domain: Domain
Channel: Channel
EventData: EventData
Account: Account
Computer: Computer
ActivityType: ActivityType
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvent
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: ObjectName
- entityType: Host
fieldMappings:
- identifier: HostName
columnName: Computer
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: Account
description: |
A Bitlocker recovery key was stored within a Tier Model computer object.
eventGroupingSettings:
aggregationKind: AlertPerResult
status: Available
query: |
SecurityEvent
| where EventID == 5137
and (EventData matches regex @"(?i)OU=Domain Controllers"
or EventData matches regex @"(?i)OU=Tier 0 PAW"
or EventData matches regex @"(?i)OU=Tier 1 PAW"
or EventData matches regex @"(?i)OU=Tier 2 PAW"
or EventData matches regex @"(?i)OU=Tier 0 Member Servers"
or EventData matches regex @"(?i)OU=Tier 1 Member Servers")
| extend ObjectClass = extract("<Data Name=\"ObjectClass\">([^<]+)</Data>", 1, EventData)
| where ObjectClass has "msFVE-RecoveryInformation"
| extend ObjectBitName_e = extract("<Data Name=\"ObjectDN\">([^<]+)</Data>", 1, EventData)
| extend ObjectFullName = extract("(?i)(CN=[^,]+,(?i)OU=[^,]+)", 1, ObjectBitName_e)
| extend ObjectName = extract("(?i)CN=([^,]+)", 1, ObjectFullName)
| extend ObjectTier = case(
ObjectFullName has "Tier 0", "Tier 0",
ObjectFullName has "Tier 1", "Tier 1",
ObjectFullName has "Tier Model Administration", "Tier 0",
ObjectFullName has "Tier Model Computer Quarantine", "Tier 0",
ObjectFullName has "Domain Controllers", "Tier 0",
"Unknown")
| extend ActivityType = extract("([a-zA-Z]+)\\.$", 1, Activity)
| extend Domain = extract("([^.]+\\.[^.]+)$", 1, Computer)
| project TimeGenerated
, ObjectName
, ObjectTier
, ObjectClass
, ActivityType
, Account
, Domain
, Computer
, Channel
, EventID
, EventData
{
"$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/eea9c640-afe0-4ce4-9a41-c409d4c2c924')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/eea9c640-afe0-4ce4-9a41-c409d4c2c924')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "A Tier Model object Bitlocker Key was stored in AD. This Informational alert is generated as part of reporting.",
"alertDisplayNameFormat": "(TM010.1) A {{ObjectTier}} Bitlocker Recovery Key was stored in AD"
},
"alertRuleTemplateName": "eea9c640-afe0-4ce4-9a41-c409d4c2c924",
"customDetails": {
"Account": "Account",
"ActivityType": "ActivityType",
"Channel": "Channel",
"Computer": "Computer",
"Domain": "Domain",
"EventData": "EventData",
"EventID": "EventID",
"ObjectClass": "ObjectClass",
"ObjectName": "ObjectName",
"ObjectTier": "ObjectTier"
},
"description": "A Bitlocker recovery key was stored within a Tier Model computer object.\n",
"displayName": "PROD (TM010.1) - BITLOCKER - Stored Bitlocker Recovery Key to Tier Level Computer Object",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "ObjectName",
"identifier": "FullName"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "Computer",
"identifier": "HostName"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Account",
"identifier": "FullName"
}
]
}
],
"eventGroupingSettings": {
"aggregationKind": "AlertPerResult"
},
"incidentConfiguration": {
"createIncident": true,
"groupingConfiguration": {
"enabled": false,
"lookbackDuration": "PT5H",
"matchingMethod": "AllEntities",
"reopenClosedIncident": false
}
},
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Active%20Directory%20Tier%20Model/Analytic%20Rules/TM010_BITLOCKERStoredBitlockerRecoveryKeyToTierLevelComputerObject.yaml",
"query": "SecurityEvent\n| where EventID == 5137\n and (EventData matches regex @\"(?i)OU=Domain Controllers\"\n or EventData matches regex @\"(?i)OU=Tier 0 PAW\"\n or EventData matches regex @\"(?i)OU=Tier 1 PAW\"\n or EventData matches regex @\"(?i)OU=Tier 2 PAW\"\n or EventData matches regex @\"(?i)OU=Tier 0 Member Servers\"\n or EventData matches regex @\"(?i)OU=Tier 1 Member Servers\")\n| extend ObjectClass = extract(\"<Data Name=\\\"ObjectClass\\\">([^<]+)</Data>\", 1, EventData)\n| where ObjectClass has \"msFVE-RecoveryInformation\"\n| extend ObjectBitName_e = extract(\"<Data Name=\\\"ObjectDN\\\">([^<]+)</Data>\", 1, EventData)\n| extend ObjectFullName = extract(\"(?i)(CN=[^,]+,(?i)OU=[^,]+)\", 1, ObjectBitName_e)\n| extend ObjectName = extract(\"(?i)CN=([^,]+)\", 1, ObjectFullName)\n| extend ObjectTier = case(\n ObjectFullName has \"Tier 0\", \"Tier 0\",\n ObjectFullName has \"Tier 1\", \"Tier 1\",\n ObjectFullName has \"Tier Model Administration\", \"Tier 0\",\n ObjectFullName has \"Tier Model Computer Quarantine\", \"Tier 0\",\n ObjectFullName has \"Domain Controllers\", \"Tier 0\",\n \"Unknown\")\n| extend ActivityType = extract(\"([a-zA-Z]+)\\\\.$\", 1, Activity)\n| extend Domain = extract(\"([^.]+\\\\.[^.]+)$\", 1, Computer)\n| project TimeGenerated\n , ObjectName\n , ObjectTier\n , ObjectClass\n , ActivityType\n , Account\n , Domain\n , Computer\n , Channel\n , EventID\n , EventData\n",
"queryFrequency": "PT5H",
"queryPeriod": "PT5H",
"severity": "Informational",
"status": "Available",
"subTechniques": [
"T1552.004"
],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CredentialAccess"
],
"techniques": [
"T1552"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}