User State changed from Guest to Member

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Id	a09a0b8e-30fe-4ebf-94a0-cffe50f579cd
Rulename	User State changed from Guest to Member
Description	Detects when a guest account in a tenant is converted to a member of the tenant. Monitoring guest accounts and the access they are provided is important to detect potential account abuse. Accounts converted to members should be investigated to ensure the activity was legitimate. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins
Severity	Medium
Tactics	Persistence
Techniques	T1098
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/UserStatechangedfromGuesttoMember.yaml
Version	1.1.0
Arm template	a09a0b8e-30fe-4ebf-94a0-cffe50f579cd.json

KQL

AuditLogs
  | where OperationName =~ "Update user"
  | where Result =~ "success"
  | mv-expand TargetResources
  | mv-expand TargetResources.modifiedProperties
  | where TargetResources_modifiedProperties.displayName =~ "TargetId.UserType"
  | extend UpdatingAppName = tostring(parse_json(tostring(InitiatedBy.app)).displayName)
  | extend UpdatingServicePrincipalId = tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalId)
  | extend UpdatingUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend UpdatingUserAadUserId = tostring(parse_json(tostring(InitiatedBy.user)).id)
  | extend UpdatingUserIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
  | extend UpdatingUser = iif(isnotempty(UpdatingServicePrincipalId), UpdatingServicePrincipalId, UpdatingUserPrincipalName)
  | extend UpdatedUserPrincipalName = tostring(TargetResources.userPrincipalName)
  | project-reorder TimeGenerated, UpdatedUserPrincipalName, UpdatingUser
  | where parse_json(tostring(TargetResources_modifiedProperties.newValue)) =~ "\"Member\"" and parse_json(tostring(TargetResources_modifiedProperties.oldValue)) =~ "\"Guest\""
  | extend InitiatingAccountName = tostring(split(UpdatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(UpdatingUserPrincipalName, "@")[1])
  | extend TargetAccountName = tostring(split(UpdatedUserPrincipalName, "@")[0]), TargetAccountUPNSuffix = tostring(split(UpdatedUserPrincipalName, "@")[1])

YAML

triggerOperator: gt
tags:
- AADSecOpsGuide
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
relevantTechniques:
- T1098
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: UpdatingAppName
  - identifier: AadUserId
    columnName: UpdatingServicePrincipalId
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: UpdatingUserPrincipalName
  - identifier: Name
    columnName: InitiatingAccountName
  - identifier: UPNSuffix
    columnName: InitiatingAccountUPNSuffix
- entityType: Account
  fieldMappings:
  - identifier: AadUserId
    columnName: UpdatingUserAadUserId
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: UpdatedUserPrincipalName
  - identifier: Name
    columnName: TargetAccountName
  - identifier: UPNSuffix
    columnName: TargetAccountUPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: UpdatingUserIPAddress
query: |
  AuditLogs
    | where OperationName =~ "Update user"
    | where Result =~ "success"
    | mv-expand TargetResources
    | mv-expand TargetResources.modifiedProperties
    | where TargetResources_modifiedProperties.displayName =~ "TargetId.UserType"
    | extend UpdatingAppName = tostring(parse_json(tostring(InitiatedBy.app)).displayName)
    | extend UpdatingServicePrincipalId = tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalId)
    | extend UpdatingUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend UpdatingUserAadUserId = tostring(parse_json(tostring(InitiatedBy.user)).id)
    | extend UpdatingUserIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
    | extend UpdatingUser = iif(isnotempty(UpdatingServicePrincipalId), UpdatingServicePrincipalId, UpdatingUserPrincipalName)
    | extend UpdatedUserPrincipalName = tostring(TargetResources.userPrincipalName)
    | project-reorder TimeGenerated, UpdatedUserPrincipalName, UpdatingUser
    | where parse_json(tostring(TargetResources_modifiedProperties.newValue)) =~ "\"Member\"" and parse_json(tostring(TargetResources_modifiedProperties.oldValue)) =~ "\"Guest\""
    | extend InitiatingAccountName = tostring(split(UpdatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(UpdatingUserPrincipalName, "@")[1])
    | extend TargetAccountName = tostring(split(UpdatedUserPrincipalName, "@")[0]), TargetAccountUPNSuffix = tostring(split(UpdatedUserPrincipalName, "@")[1])  
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/UserStatechangedfromGuesttoMember.yaml
queryPeriod: 1d
tactics:
- Persistence
metadata:
  author:
    name: Microsoft Security Research
  source:
    kind: Community
  support:
    tier: Community
  categories:
    domains:
    - Security - Others
    - Identity
name: User State changed from Guest to Member
kind: Scheduled
description: |
  'Detects when a guest account in a tenant is converted to a member of the tenant.
    Monitoring guest accounts and the access they are provided is important to detect potential account abuse.
    Accounts converted to members should be investigated to ensure the activity was legitimate.
    Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins'  
id: a09a0b8e-30fe-4ebf-94a0-cffe50f579cd
version: 1.1.0
queryFrequency: 1d
severity: Medium

ARM