Account Created and Deleted in Short Timeframe
| Id | bb616d82-108f-47d3-9dec-9652ea0d3bf6 |
| Rulename | Account Created and Deleted in Short Timeframe |
| Description | Search for user principal name (UPN) events. Look for accounts created and then deleted in under 24 hours. Attackers may create an account for their use, and then remove the account when no longer needed. Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#short-lived-account |
| Severity | High |
| Tactics | InitialAccess |
| Techniques | T1078.004 |
| Required data connectors | AzureActiveDirectory |
| Kind | Scheduled |
| Query frequency | 1h |
| Query period | 1d |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/AccountCreatedandDeletedinShortTimeframe.yaml |
| Version | 1.1.0 |
| Arm template | bb616d82-108f-47d3-9dec-9652ea0d3bf6.json |
let queryfrequency = 1h;
let queryperiod = 1d;
AuditLogs
| where TimeGenerated > ago(queryfrequency)
| where OperationName =~ "Delete user"
| mv-apply TargetResource = TargetResources on
(
where TargetResource.type == "User"
| extend TargetUserPrincipalName = extract(@'([a-f0-9]{32})?(.*)', 2, tostring(TargetResource.userPrincipalName))
)
| extend DeletedByApp = tostring(InitiatedBy.app.displayName),
DeletedByAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId),
DeletedByUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName),
DeletedByAadUserId = tostring(InitiatedBy.user.id),
DeletedByIPAddress = tostring(InitiatedBy.user.ipAddress)
| project Deletion_TimeGenerated = TimeGenerated, TargetUserPrincipalName, DeletedByApp, DeletedByAppServicePrincipalId, DeletedByUserPrincipalName, DeletedByAadUserId, DeletedByIPAddress,
Deletion_AdditionalDetails = AdditionalDetails, Deletion_InitiatedBy = InitiatedBy, Deletion_TargetResources = TargetResources
| join kind=inner (
AuditLogs
| where TimeGenerated > ago(queryperiod)
| where OperationName =~ "Add user"
| mv-apply TargetResource = TargetResources on
(
where TargetResource.type == "User"
| extend TargetUserPrincipalName = trim(@'"',tostring(TargetResource.userPrincipalName))
)
| project-rename Creation_TimeGenerated = TimeGenerated
) on TargetUserPrincipalName
| extend TimeDelta = Deletion_TimeGenerated - Creation_TimeGenerated
| where TimeDelta between (time(0s) .. queryperiod)
| extend CreatedByApp = tostring(InitiatedBy.app.displayName),
CreatedByAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId),
CreatedByUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName),
CreatedByAadUserId = tostring(InitiatedBy.user.id),
CreatedByIPAddress = tostring(InitiatedBy.user.ipAddress)
| project Creation_TimeGenerated, Deletion_TimeGenerated, TimeDelta, TargetUserPrincipalName, DeletedByApp, DeletedByAppServicePrincipalId, DeletedByUserPrincipalName, DeletedByAadUserId, DeletedByIPAddress,
CreatedByApp, CreatedByAppServicePrincipalId, CreatedByUserPrincipalName, CreatedByAadUserId, CreatedByIPAddress, Creation_AdditionalDetails = AdditionalDetails, Creation_InitiatedBy = InitiatedBy, Creation_TargetResources = TargetResources, Deletion_AdditionalDetails, Deletion_InitiatedBy, Deletion_TargetResources
| extend TargetName = tostring(split(TargetUserPrincipalName,'@',0)[0]), TargetUPNSuffix = tostring(split(TargetUserPrincipalName,'@',1)[0])
| extend CreatedByName = tostring(split(CreatedByUserPrincipalName,'@',0)[0]), CreatedByUPNSuffix = tostring(split(CreatedByUserPrincipalName,'@',1)[0])
| extend DeletedByName = tostring(split(DeletedByUserPrincipalName,'@',0)[0]), DeletedByUPNSuffix = tostring(split(DeletedByUserPrincipalName,'@',1)[0])
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/AccountCreatedandDeletedinShortTimeframe.yaml
tags:
- AADSecOpsGuide
description: |
'Search for user principal name (UPN) events. Look for accounts created and then deleted in under 24 hours. Attackers may create an account for their use, and then remove the account when no longer needed.
Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#short-lived-account'
severity: High
requiredDataConnectors:
- dataTypes:
- SigninLogs
connectorId: AzureActiveDirectory
name: Account Created and Deleted in Short Timeframe
triggerThreshold: 0
tactics:
- InitialAccess
version: 1.1.0
relevantTechniques:
- T1078.004
triggerOperator: gt
entityMappings:
- entityType: Account
fieldMappings:
- columnName: TargetUserPrincipalName
identifier: FullName
- columnName: TargetName
identifier: Name
- columnName: TargetUPNSuffix
identifier: UPNSuffix
- entityType: Account
fieldMappings:
- columnName: CreatedByUserPrincipalName
identifier: FullName
- columnName: CreatedByName
identifier: Name
- columnName: CreatedByUPNSuffix
identifier: UPNSuffix
- entityType: Account
fieldMappings:
- columnName: CreatedByAadUserId
identifier: AadUserId
- entityType: Account
fieldMappings:
- columnName: DeletedByUserPrincipalName
identifier: FullName
- columnName: DeletedByName
identifier: Name
- columnName: DeletedByUPNSuffix
identifier: UPNSuffix
- entityType: Account
fieldMappings:
- columnName: DeletedByAadUserId
identifier: AadUserId
- entityType: IP
fieldMappings:
- columnName: CreatedByIPAddress
identifier: Address
- entityType: IP
fieldMappings:
- columnName: DeletedByIPAddress
identifier: Address
id: bb616d82-108f-47d3-9dec-9652ea0d3bf6
status: Available
kind: Scheduled
queryFrequency: 1h
queryPeriod: 1d
query: |
let queryfrequency = 1h;
let queryperiod = 1d;
AuditLogs
| where TimeGenerated > ago(queryfrequency)
| where OperationName =~ "Delete user"
| mv-apply TargetResource = TargetResources on
(
where TargetResource.type == "User"
| extend TargetUserPrincipalName = extract(@'([a-f0-9]{32})?(.*)', 2, tostring(TargetResource.userPrincipalName))
)
| extend DeletedByApp = tostring(InitiatedBy.app.displayName),
DeletedByAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId),
DeletedByUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName),
DeletedByAadUserId = tostring(InitiatedBy.user.id),
DeletedByIPAddress = tostring(InitiatedBy.user.ipAddress)
| project Deletion_TimeGenerated = TimeGenerated, TargetUserPrincipalName, DeletedByApp, DeletedByAppServicePrincipalId, DeletedByUserPrincipalName, DeletedByAadUserId, DeletedByIPAddress,
Deletion_AdditionalDetails = AdditionalDetails, Deletion_InitiatedBy = InitiatedBy, Deletion_TargetResources = TargetResources
| join kind=inner (
AuditLogs
| where TimeGenerated > ago(queryperiod)
| where OperationName =~ "Add user"
| mv-apply TargetResource = TargetResources on
(
where TargetResource.type == "User"
| extend TargetUserPrincipalName = trim(@'"',tostring(TargetResource.userPrincipalName))
)
| project-rename Creation_TimeGenerated = TimeGenerated
) on TargetUserPrincipalName
| extend TimeDelta = Deletion_TimeGenerated - Creation_TimeGenerated
| where TimeDelta between (time(0s) .. queryperiod)
| extend CreatedByApp = tostring(InitiatedBy.app.displayName),
CreatedByAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId),
CreatedByUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName),
CreatedByAadUserId = tostring(InitiatedBy.user.id),
CreatedByIPAddress = tostring(InitiatedBy.user.ipAddress)
| project Creation_TimeGenerated, Deletion_TimeGenerated, TimeDelta, TargetUserPrincipalName, DeletedByApp, DeletedByAppServicePrincipalId, DeletedByUserPrincipalName, DeletedByAadUserId, DeletedByIPAddress,
CreatedByApp, CreatedByAppServicePrincipalId, CreatedByUserPrincipalName, CreatedByAadUserId, CreatedByIPAddress, Creation_AdditionalDetails = AdditionalDetails, Creation_InitiatedBy = InitiatedBy, Creation_TargetResources = TargetResources, Deletion_AdditionalDetails, Deletion_InitiatedBy, Deletion_TargetResources
| extend TargetName = tostring(split(TargetUserPrincipalName,'@',0)[0]), TargetUPNSuffix = tostring(split(TargetUserPrincipalName,'@',1)[0])
| extend CreatedByName = tostring(split(CreatedByUserPrincipalName,'@',0)[0]), CreatedByUPNSuffix = tostring(split(CreatedByUserPrincipalName,'@',1)[0])
| extend DeletedByName = tostring(split(DeletedByUserPrincipalName,'@',0)[0]), DeletedByUPNSuffix = tostring(split(DeletedByUserPrincipalName,'@',1)[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/bb616d82-108f-47d3-9dec-9652ea0d3bf6')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/bb616d82-108f-47d3-9dec-9652ea0d3bf6')]",
"properties": {
"alertRuleTemplateName": "bb616d82-108f-47d3-9dec-9652ea0d3bf6",
"customDetails": null,
"description": "'Search for user principal name (UPN) events. Look for accounts created and then deleted in under 24 hours. Attackers may create an account for their use, and then remove the account when no longer needed.\nRef : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#short-lived-account'\n",
"displayName": "Account Created and Deleted in Short Timeframe",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "TargetUserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "TargetName",
"identifier": "Name"
},
{
"columnName": "TargetUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "CreatedByUserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "CreatedByName",
"identifier": "Name"
},
{
"columnName": "CreatedByUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "CreatedByAadUserId",
"identifier": "AadUserId"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "DeletedByUserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "DeletedByName",
"identifier": "Name"
},
{
"columnName": "DeletedByUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "DeletedByAadUserId",
"identifier": "AadUserId"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "CreatedByIPAddress",
"identifier": "Address"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "DeletedByIPAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/AccountCreatedandDeletedinShortTimeframe.yaml",
"query": "let queryfrequency = 1h;\nlet queryperiod = 1d;\nAuditLogs\n| where TimeGenerated > ago(queryfrequency)\n| where OperationName =~ \"Delete user\"\n| mv-apply TargetResource = TargetResources on \n (\n where TargetResource.type == \"User\"\n | extend TargetUserPrincipalName = extract(@'([a-f0-9]{32})?(.*)', 2, tostring(TargetResource.userPrincipalName))\n )\n| extend DeletedByApp = tostring(InitiatedBy.app.displayName),\nDeletedByAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId),\nDeletedByUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName),\nDeletedByAadUserId = tostring(InitiatedBy.user.id),\nDeletedByIPAddress = tostring(InitiatedBy.user.ipAddress)\n| project Deletion_TimeGenerated = TimeGenerated, TargetUserPrincipalName, DeletedByApp, DeletedByAppServicePrincipalId, DeletedByUserPrincipalName, DeletedByAadUserId, DeletedByIPAddress, \nDeletion_AdditionalDetails = AdditionalDetails, Deletion_InitiatedBy = InitiatedBy, Deletion_TargetResources = TargetResources\n| join kind=inner (\n AuditLogs\n | where TimeGenerated > ago(queryperiod)\n | where OperationName =~ \"Add user\" \n | mv-apply TargetResource = TargetResources on \n (\n where TargetResource.type == \"User\"\n | extend TargetUserPrincipalName = trim(@'\"',tostring(TargetResource.userPrincipalName))\n )\n | project-rename Creation_TimeGenerated = TimeGenerated\n) on TargetUserPrincipalName\n| extend TimeDelta = Deletion_TimeGenerated - Creation_TimeGenerated\n| where TimeDelta between (time(0s) .. queryperiod)\n| extend CreatedByApp = tostring(InitiatedBy.app.displayName),\nCreatedByAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId),\nCreatedByUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName),\nCreatedByAadUserId = tostring(InitiatedBy.user.id),\nCreatedByIPAddress = tostring(InitiatedBy.user.ipAddress)\n| project Creation_TimeGenerated, Deletion_TimeGenerated, TimeDelta, TargetUserPrincipalName, DeletedByApp, DeletedByAppServicePrincipalId, DeletedByUserPrincipalName, DeletedByAadUserId, DeletedByIPAddress, \nCreatedByApp, CreatedByAppServicePrincipalId, CreatedByUserPrincipalName, CreatedByAadUserId, CreatedByIPAddress, Creation_AdditionalDetails = AdditionalDetails, Creation_InitiatedBy = InitiatedBy, Creation_TargetResources = TargetResources, Deletion_AdditionalDetails, Deletion_InitiatedBy, Deletion_TargetResources\n| extend TargetName = tostring(split(TargetUserPrincipalName,'@',0)[0]), TargetUPNSuffix = tostring(split(TargetUserPrincipalName,'@',1)[0])\n| extend CreatedByName = tostring(split(CreatedByUserPrincipalName,'@',0)[0]), CreatedByUPNSuffix = tostring(split(CreatedByUserPrincipalName,'@',1)[0])\n| extend DeletedByName = tostring(split(DeletedByUserPrincipalName,'@',0)[0]), DeletedByUPNSuffix = tostring(split(DeletedByUserPrincipalName,'@',1)[0])\n",
"queryFrequency": "PT1H",
"queryPeriod": "P1D",
"severity": "High",
"status": "Available",
"subTechniques": [
"T1078.004"
],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"tags": [
"AADSecOpsGuide"
],
"techniques": [
"T1078"
],
"templateVersion": "1.1.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}