Update Azure AD Application Required Resource Access

Metadata

platform

Azure

contributors

Roberto Rodriguez @Cyb3rWard0g,MSTIC R&D

creation date

2021-08-05

modification date

2021-09-08

Tactics

TA0003

Techniques

T1098.002

Description

A threat actor might want to update the required resource access property of an Azure AD application via Microsoft Graph APIs and the right permissions. The requiredResourceAccess property of an application specifies resources that the application requires access to and the set of OAuth permission scopes (delegated) and application roles (application) that it needs under each of those resources. This pre-configuration of required resource access drives the consent experience. This does not grant permissions consent.

Run Simulation

Get OAuth Access Token

from msal import PublicClientApplication
import requests
import time

function_app_url = "https://FUNCTION_APP_NAME.azurewebsites.net"

tenant_id = "TENANT_ID"
public_client_app_id = "KATANA_CLIENT_APP_ID"
server_app_id_uri = "api://" + tenant_id + "/cloudkatana"
scope = server_app_id_uri + "/user_impersonation"

app = PublicClientApplication(
    public_client_app_id,
    authority="https://login.microsoftonline.com/" + tenant_id
)
result = app.acquire_token_interactive(scopes=[scope])
bearer_token = result['access_token']

Set Azure Function Orchestrator

endpoint = function_app_url + "/api/orchestrators/Orchestrator"

Prepare HTTP Body

data = [{'RequestId': 'd795aaa9-7c4a-4995-a2cf-ac1cb22665b4', 'name': 'Update Azure AD Application Required Resource Access', 'metadata': {'creationDate': '2021-08-05', 'modificationDate': '2021-09-08', 'description': 'A threat actor might want to update the required resource access property of an Azure AD application via Microsoft Graph APIs and the right permissions. The requiredResourceAccess property of an application specifies resources that the application requires access to and the set of OAuth permission scopes (delegated) and application roles (application) that it needs under each of those resources. This pre-configuration of required resource access drives the consent experience. This does not grant permissions consent.\n', 'contributors': ['Roberto Rodriguez @Cyb3rWard0g', 'MSTIC R&D'], 'mitreAttack': [{'technique': 'T1098.002', 'tactics': ['TA0003']}]}, 'steps': [{'schema': 'atomic', 'id': 'c0d902ba-e4a9-418e-93fe-c3b0c0df65db', 'name': 'Update Azure AD Application Required Resource Access', 'metadata': {'creationDate': '2021-08-05', 'modificationDate': '2021-09-08', 'description': 'A threat actor might want to update the required resource access property of an Azure AD application via Microsoft Graph APIs and the right permissions. The requiredResourceAccess property of an application specifies resources that the application requires access to and the set of OAuth permission scopes (delegated) and application roles (application) that it needs under each of those resources. This pre-configuration of required resource access drives the consent experience. This does not grant permissions consent.\n', 'contributors': ['Roberto Rodriguez @Cyb3rWard0g', 'MSTIC R&D'], 'mitreAttack': [{'technique': 'T1098.002', 'tactics': ['TA0003']}]}, 'authorization': [{'resource': 'https://graph.microsoft.com/', 'permissionsType': 'application', 'permissions': ['Application.ReadWrite.All']}], 'execution': {'type': 'ScriptModule', 'platform': 'Azure', 'executor': 'PowerShell', 'module': {'name': 'CloudKatanaAbilities', 'version': 1.0, 'function': 'Update-CKAzADAppReqRscAccess'}, 'parameters': {}}, 'number': 1}]}]

Send HTTP Request

http_headers = {'Authorization': 'Bearer ' + bearer_token, 'Accept': 'application/json','Content-Type': 'application/json'}
results = requests.get(endpoint, json=data, headers=http_headers, stream=False).json()

time.sleep(30)

Explore Output

query_status = requests.get(results['statusQueryGetUri'], headers=http_headers, stream=False).json()
query_results = query_status['output']
query_results