Dataverse - Login from IP not in the allow list

Status: available
Severity: high
Time window: 1d
Group by: ClientIp, InstanceUrl, UserId
Source: github.com/Azure/Azure-Sentinel

Identifies logons from IPv4 addresses not matching IPv4 subnets maintained on an allow list. This analytics rule uses the NetworkAddresses watchlist template.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1078` Valid Accounts `T1133` External Remote Services `T1190` Exploit Public-Facing Application

Telemetry coverage

Platform	Record / event type
Microsoft 365	any: Dataverse and model-driven apps audit (catch-all)

Rule body

id: 81c693fe-f6c4-4352-bc10-3526f6e22637
kind: Scheduled
name: Dataverse - Login from IP not in the allow list
description: Identifies logons from IPv4 addresses not matching IPv4 subnets maintained
  on an allow list. This analytics rule uses the NetworkAddresses watchlist template.
severity: High
status: Available
requiredDataConnectors:
  - connectorId: Dataverse
    dataTypes:
      - DataverseActivity
queryFrequency: 1h
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
relevantTechniques:
  - T1078
  - T1190
  - T1133
query: |
  // Use static IP address or CIDR list specified in the
  // NetworkAddresses watchlist template with tag "AllowDataverse"
  let allowed_networks = MSBizAppsNetworkAddresses()
      | where Tags has "AllowDataverse"
      | summarize by IPSubnet;
  let query_frequency = 1h;
  let watchlist_entries_count = toscalar (allowed_networks
      | summarize count());
  let dataverse_signin_activity = materialize(
      DataverseActivity
      | where watchlist_entries_count > 0
      | where TimeGenerated >= ago (query_frequency)
      | where Message == "UserSignIn" and isnotempty(ClientIp)
      | summarize FirstEvent = arg_min(TimeGenerated, *) by UserId, ClientIp, InstanceUrl
      );
  let authorized_ip_addresses = dataverse_signin_activity
      | evaluate ipv4_lookup(allowed_networks, ClientIp, IPSubnet);
  dataverse_signin_activity
  | join kind=leftanti(authorized_ip_addresses) on ClientIp
  | extend
      CloudAppId = int(32780),
      AccountName = tostring(split(UserId, '@')[0]),
      UPNSuffix = tostring(split(UserId, '@')[1])
  | project
      FirstEvent,
      UserId,
      ClientIp,
      InstanceUrl,
      CloudAppId,
      AccountName,
      UPNSuffix
eventGroupingSettings:
  aggregationKind: AlertPerResult
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: ClientIp
  - entityType: CloudApplication
    fieldMappings:
      - identifier: AppId
        columnName: CloudAppId
      - identifier: InstanceName
        columnName: InstanceUrl
alertDetailsOverride:
  alertDisplayNameFormat: 'Dataverse - Login from IP not on the allow list in {{InstanceUrl}} '
  alertDescriptionFormat: Sign-in activity detected in {{InstanceUrl}} from an IP
    {{ClientIp}} not on the allow list.
version: 3.2.0

Stages and Predicates

Parameters

let query_frequency = 1h;

let dataverse_signin_activity is inlined into the numbered stages below.

Let binding: `allowed_networks`

let allowed_networks = MSBizAppsNetworkAddresses()
    | where Tags has "AllowDataverse"
    | summarize by IPSubnet;

Let binding: `watchlist_entries_count` used in Stage 2

let watchlist_entries_count = toscalar (allowed_networks
    | summarize count());

Let binding: `authorized_ip_addresses` used in Stage 6

let authorized_ip_addresses = dataverse_signin_activity
    | evaluate ipv4_lookup(allowed_networks, ClientIp, IPSubnet);

Stages 1 to 5 define let dataverse_signin_activity (the rule's main pipeline source); stages 6 to 8 run on it.

Stage 1: `source`

DataverseActivity

Stage 2: `where`

| where watchlist_entries_count > 0

Stage 3: `where`

| where TimeGenerated >= ago (query_frequency)

Stage 4: `where`

| where Message == "UserSignIn" and isnotempty(ClientIp)

Stage 5: `summarize`

| summarize FirstEvent = arg_min(TimeGenerated, *) by UserId, ClientIp, InstanceUrl

Stage 6: `join` (negated)

dataverse_signin_activity
| join kind=leftanti(authorized_ip_addresses) on ClientIp

Stage 7: `extend`

| extend
    CloudAppId = int(32780),
    AccountName = tostring(split(UserId, '@')[0]),
    UPNSuffix = tostring(split(UserId, '@')[1])

Stage 8: `project`

| project
    FirstEvent,
    UserId,
    ClientIp,
    InstanceUrl,
    CloudAppId,
    AccountName,
    UPNSuffix

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`ClientIp`	is_not_null	(no value, null check)	`excludes:ClientIp`
`Message`	eq	`UserSignIn`	`excludes:Message` `field:"Message" value:"UserSignIn"`
`watchlist_entries_count`	gt	`0`	`excludes:watchlist_entries_count` `field:"watchlist_entries_count" value:"0"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ClientIp`	is_not_null	(no value, null check)	`field:"ClientIp" kind:is_not_null`
`Message`	eq	`UserSignIn`	`field:"Message" kind:eq value:"UserSignIn"`
`watchlist_entries_count`	gt	`0`	`field:"watchlist_entries_count" kind:gt value:"0"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`AccountName`	`project`
`ClientIp`	`project`
`CloudAppId`	`project`
`FirstEvent`	`project`
`InstanceUrl`	`project`
`UPNSuffix`	`project`
`UserId`	`project`

Dataverse - Login from IP not in the allow list

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Parameters

Let binding: allowed_networks

Let binding: watchlist_entries_count used in Stage 2

Let binding: authorized_ip_addresses used in Stage 6

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: summarize

Stage 6: join (negated)

Stage 7: extend

Stage 8: project