SAP BTP - Trust and authorization Identity Provider monitor

Status: available
Severity: medium
Time window: 15m
Source: github.com/Azure/Azure-Sentinel

Identifies CRUD operations on Identity Provider settings within a sub account.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1134` Access Token Manipulation
Credential Access	`T1556` Modify Authentication Process `T1606` Forge Web Credentials

Rule body

id: 62357c23-ecdc-4edc-9349-8338063af1ef
kind: Scheduled
name: SAP BTP - Trust and authorization Identity Provider monitor
description: Identifies CRUD operations on Identity Provider settings within a sub
  account.
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: SAPBTPAuditEvents
    dataTypes:
      - SAPBTPAuditLog_CL
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CredentialAccess
  - PrivilegeEscalation
relevantTechniques:
  - T1606
  - T1556
  - T1134
query: |
  SAPBTPAuditLog_CL
  | where isnotnull(Message.object)
  | extend Object = Message.object, Attributes = Message.attributes
  | where Object.type == "IdentityProvider"
  | extend CrudType = tostring(parse_json(tostring(Object.id)).crudType)
  | mv-expand Attributes
  | extend MessageText = case(
                             CrudType == "CREATE",
                             "An identity provider was created",
                             CrudType == "UPDATE",
                             "An identity provider was updated",
                             CrudType == "DELETE",
                             "An identity provider was deleted",
                             "Unclassified CRUD operation encountered"
                         )
  | extend NewAttributes = parse_json(replace_regex(tostring(Attributes.new), "\\r", ""))
  | extend OldAttributes = parse_json(replace_regex(tostring(Attributes.old), "\\r", ""))
  | extend IdentityProviderName = case(
                                      CrudType == "CREATE" or CrudType == "UPDATE",
                                      NewAttributes.name,
                                      CrudType == "DELETE",
                                      OldAttributes.name,
                                      "Unknown"
                                  )
  | project
      UpdatedOn,
      UserName,
      MessageText,
      IdentityProviderName,
      Tenant,
      SpaceId,
      CloudApp = "SAP BTP"
  | extend AccountName = split(UserName, "@")[0], UPNSuffix = split(UserName, "@")[1]
eventGroupingSettings:
  aggregationKind: SingleAlert
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: CloudApplication
    fieldMappings:
      - identifier: Name
        columnName: CloudApp
alertDetailsOverride:
  alertDisplayNameFormat: 'SAP BTP: {{MessageText}}'
  alertDescriptionFormat: '{{MessageText}} by {{UserName}}. Identity provider name:
    {{IdentityProviderName}}'
version: 3.0.6

Stages and Predicates

Stage 1: `source`

SAPBTPAuditLog_CL

Stage 2: `where`

| where isnotnull(Message.object)

Stage 3: `extend`

| extend Object = Message.object, Attributes = Message.attributes

Stage 4: `where`

| where Object.type == "IdentityProvider"

Stage 5: `extend`

| extend CrudType = tostring(parse_json(tostring(Object.id)).crudType)

Stage 6: `mv-expand`

| mv-expand Attributes

Stage 7: `extend` (4 consecutive steps)

| extend MessageText = case(
                           CrudType == "CREATE",
                           "An identity provider was created",
                           CrudType == "UPDATE",
                           "An identity provider was updated",
                           CrudType == "DELETE",
                           "An identity provider was deleted",
                           "Unclassified CRUD operation encountered"
                       )
| extend NewAttributes = parse_json(replace_regex(tostring(Attributes.new), "\\r", ""))
| extend OldAttributes = parse_json(replace_regex(tostring(Attributes.old), "\\r", ""))
| extend IdentityProviderName = case(
                                    CrudType == "CREATE" or CrudType == "UPDATE",
                                    NewAttributes.name,
                                    CrudType == "DELETE",
                                    OldAttributes.name,
                                    "Unknown"
                                )

MessageText =

ifCrudType == "CREATE""An identity provider was created"

elifCrudType == "UPDATE""An identity provider was updated"

elifCrudType == "DELETE""An identity provider was deleted"

else"Unclassified CRUD operation encountered"

Stage 8: `project`

| project
    UpdatedOn,
    UserName,
    MessageText,
    IdentityProviderName,
    Tenant,
    SpaceId,
    CloudApp = "SAP BTP"

Stage 9: `extend`

| extend AccountName = split(UserName, "@")[0], UPNSuffix = split(UserName, "@")[1]

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`object`	is_not_null	(no value, null check)	`field:"group.name" kind:is_not_null`
`type`	eq	`IdentityProvider`	`field:"type" kind:eq value:"IdentityProvider"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`CloudApp`	`project`
`IdentityProviderName`	`project`
`MessageText`	`project`
`SpaceId`	`project`
`Tenant`	`project`
`UpdatedOn`	`project`
`UserName`	`project`
`AccountName`	`extend`
`UPNSuffix`	`extend`

SAP BTP - Trust and authorization Identity Provider monitor

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: where

Stage 5: extend

Stage 6: mv-expand

Stage 7: extend (4 consecutive steps)

Stage 8: project

Stage 9: extend