Dataverse - Suspicious use of Web API

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Id	8a6ecba2-ccfe-4c8c-b086-fa3e6ff7fa86
Rulename	Dataverse - Suspicious use of Web API
Description	Identifies sign-in across multiple Dataverse environments, breaching a predefined threshold, originating from a user with IP address that was used to sign-into the well known Microsoft Entra app registration.
Severity	Medium
Tactics	Execution Exfiltration Reconnaissance Discovery
Techniques	T1106 T1567 T1595 T1526 T1580
Required data connectors	AzureActiveDirectory Dataverse
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Suspicious use of Web API.yaml
Version	3.2.0
Arm template	8a6ecba2-ccfe-4c8c-b086-fa3e6ff7fa86.json

KQL

let query_frequency = 1h;
let query_lookback = 24h;
// AppID of the multi-tenant Dynamics 365 Example Client Application
let well_known_app_id = "51f81489-12ee-4a9e-aaae-a2591f45987d";
let environment_count_threshold = 10;
SigninLogs
| where TimeGenerated >= ago(query_lookback)
// Comment out the line below to monitor activity from all Azure AD apps
| where AppId == well_known_app_id
| where ResourceIdentity == '00000007-0000-0000-c000-000000000000'
| summarize FirstSeen = min(TimeGenerated) by AppId, UserPrincipalName, IPAddress, AppDisplayName
| join kind=inner (
    DataverseActivity
    | where TimeGenerated >= ago(query_frequency)
    | where Message == "UserSignIn")
    on $left.UserPrincipalName == $right.UserId, $left.IPAddress == $right.ClientIp
| where TimeGenerated between (FirstSeen .. (FirstSeen + 2h))
| summarize InstanceCount = dcount(InstanceUrl, 4), FirstSeen = min(FirstSeen) by UserId, ClientIp, InstanceUrl, AppDisplayName, AppId
| where InstanceCount > environment_count_threshold
| extend
    CloudAppId = int(32780),
    AccountName = tostring(split(UserId, '@')[0]),
    UPNSuffix = tostring(split(UserId, '@')[1])
| project
    FirstSeen,
    UserId,
    ClientIp,
    AppDisplayName,
    AppId,
    InstanceUrl,
    CloudAppId,
    AccountName,
    UPNSuffix

YAML

queryPeriod: 14d
query: |
  let query_frequency = 1h;
  let query_lookback = 24h;
  // AppID of the multi-tenant Dynamics 365 Example Client Application
  let well_known_app_id = "51f81489-12ee-4a9e-aaae-a2591f45987d";
  let environment_count_threshold = 10;
  SigninLogs
  | where TimeGenerated >= ago(query_lookback)
  // Comment out the line below to monitor activity from all Azure AD apps
  | where AppId == well_known_app_id
  | where ResourceIdentity == '00000007-0000-0000-c000-000000000000'
  | summarize FirstSeen = min(TimeGenerated) by AppId, UserPrincipalName, IPAddress, AppDisplayName
  | join kind=inner (
      DataverseActivity
      | where TimeGenerated >= ago(query_frequency)
      | where Message == "UserSignIn")
      on $left.UserPrincipalName == $right.UserId, $left.IPAddress == $right.ClientIp
  | where TimeGenerated between (FirstSeen .. (FirstSeen + 2h))
  | summarize InstanceCount = dcount(InstanceUrl, 4), FirstSeen = min(FirstSeen) by UserId, ClientIp, InstanceUrl, AppDisplayName, AppId
  | where InstanceCount > environment_count_threshold
  | extend
      CloudAppId = int(32780),
      AccountName = tostring(split(UserId, '@')[0]),
      UPNSuffix = tostring(split(UserId, '@')[1])
  | project
      FirstSeen,
      UserId,
      ClientIp,
      AppDisplayName,
      AppId,
      InstanceUrl,
      CloudAppId,
      AccountName,
      UPNSuffix  
version: 3.2.0
name: Dataverse - Suspicious use of Web API
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: ClientIp
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: CloudAppId
    identifier: AppId
  - columnName: InstanceUrl
    identifier: InstanceName
  entityType: CloudApplication
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Suspicious use of Web API.yaml
alertDetailsOverride:
  alertDisplayNameFormat: Dataverse - Suspicious Web API sign-in activity
  alertDescriptionFormat: '{{UserId}} sign-in activity generated in {{InstanceUrl}}. The app used was a well known multi-tenant app not owned or registered by the organization.'
description: Identifies sign-in across multiple Dataverse environments, breaching a predefined threshold, originating from a user with IP address that was used to sign-into the well known Microsoft Entra app registration.
kind: Scheduled
status: Available
severity: Medium
requiredDataConnectors:
- connectorId: Dataverse
  dataTypes:
  - DataverseActivity
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
triggerOperator: gt
triggerThreshold: 0
tactics:
- Execution
- Exfiltration
- Reconnaissance
- Discovery
id: 8a6ecba2-ccfe-4c8c-b086-fa3e6ff7fa86
relevantTechniques:
- T1106
- T1567
- T1595
- T1526
- T1580

ARM