ATEAM: Azure Tenant Enumeration and Attribution Module

A Python reconnaissance tool designed to discover Azure services and attribute tenant ownership information based on their responses.

Author, Contributors, and License

• Authors:
  • Karl Fosaaen (@kfosaaen - On most platforms), NetSPI
  • Thomas Elling (@thomaselling1), NetSPI
• License: BSD 3-Clause

🎯 Purpose

This tool helps security researchers, penetration testers, and Azure administrators discover Azure resources associated with specific tenant IDs.

✨ Features

Multi-Service Discovery

Tests resource names against 6 different Azure services and their subdomains:

• Azure App Services (.azurewebsites.net and .scm.azurewebsites.net)
• Azure DevOps (dev.azure.com)
• Azure Key Vault (.vault.azure.net)
• Azure Storage Accounts (.blob.core.windows.net)
• SharePoint Online (.sharepoint.com)
• Azure Databricks (.azuredatabricks.net)

Additional Capabilities

• Concurrent Processing: Multi-threaded scanning for faster results
• Batch Processing: Processes resources in configurable batches to prevent memory issues
• DNS Validation: Confirms DNS records before making HTTP requests
• Permutation Generation: Automatically generates variations of resource names
• Database Storage: SQLite database for persistent results
• Multiple Export Formats: CSV, JSON, and HTML exports
• Verbose Logging: Detailed debug information for troubleshooting

📋 Prerequisites

• Python 3.7 or higher
• Internet connection
• Required Python packages (see Installation below)

🚀 Installation

1. Clone or download the tool:

   git clone https://github.com/NetSPI/ATEAM.git
   cd ATEAM

2. Install required dependencies:

   pip install -r requirements.txt

   Or install manually:

   pip install requests dnspython urllib3

3. Verify installation:

   python ateam.py --help

📖 Usage

Basic Usage

Scan a single resource:

python ateam.py -r "myapp"

Scan multiple resources:

python ateam.py -r "app1" "app2" "app3"

Scan from a text file resource list:

python ateam.py -f resources.txt

Advanced Usage

Verbose output with (20) workers:

python ateam.py -f resources.txt -v -w 20

Generate permutations and scan:

python ateam.py -f resources.txt -p

Generate permutations with smaller batch size (recommended for large scans):

python ateam.py -f resources.txt -p -b 100

Export results to HTML:

python ateam.py -e html

Clear database and start fresh:

python ateam.py -f resources.txt --clear

Command Line Options

Option	Description	Example
-f, --file	File containing resources (one per line)	-f resources.txt
-r, --resources	Space-separated list of resources	-r "app1" "app2"
-w, --workers	Number of concurrent workers (default: 10)	-w 20
-b, --batch-size	Resources per batch (default: 1000)	-b 100
-v, --verbose	Enable verbose logging	-v
-l, --list	List all database entries	-l
-e, --export	Export results (csv, json, html)	-e html
--clear	Clear database before scanning	--clear
-t, --tenant	Filter results by tenant ID	-t "tenant-id"
-p, --permutations	Generate resource name permutations	-p

📁 File Structure

ATEAM/
├── ateam.py    # Main script
├── requirements.txt          # Python dependencies
├── permutations.txt          # Resource name permutations
└── README.md                 # This file

🔧 Configuration

Permutations File

The permutations.txt file contains common prefixes and suffixes to generate variations of resource names:

dev
prod
test
staging
api
web
...

This will generate combinations like:

• devmyapp
• myappdev
• prodmyapp
• myapp-prod
• etc.

Database

Results are stored in azure_tenants.db (SQLite) with the following schema:

• resource_uri: The discovered resource URL
• resource_type: Type of Azure service
• tenant_id: Extracted tenant ID
• discovered_at: Timestamp of discovery

📊 Output Examples

Console Output

2025-06-27 14:37:39 - INFO - Found Storage Account tenant ID 72f988bf-86f1-41af-91ab-2d7cd011db47 for mars
2025-06-27 14:37:40 - INFO - Found App Service SCM tenant ID 'common' for notarealapplication
2025-06-27 14:37:47 - INFO - Found Key Vault tenant ID 72f988bf-86f1-41af-91ab-2d7cd011db47 for mdo

Database Listing

Resource URI                             Type            Tenant ID                      	  Discovered At
-----------------------------------------------------------------------------------------------------------------
hanover.scm.azurewebsites.net            AppServices-SCM 72f988bf-86f1-41af-91ab-2d7cd011db47 2025-06-27 21:37:41
dev.azure.com/microsoft                  DevOps          72f988bf-86f1-41af-91ab-2d7cd011db47 2025-06-27 21:37:12
mdo.vault.azure.net                      KeyVault        72f988bf-86f1-41af-91ab-2d7cd011db47 2025-06-27 21:37:47
mars.blob.core.windows.net               StorageAccount  72f988bf-86f1-41af-91ab-2d7cd011db47 2025-06-27 21:37:46

🔍 How It Works

1. DNS Validation: Checks if DNS records exist for the resource
2. Service Probing: Makes HTTP requests to the applicable Azure service endpoints
3. Response Analysis: Depending on the resource, extracts tenant IDs from:
   • WWW-Authenticate headers
   • OAuth redirect URLs
   • Response headers
   • Error messages
4. Data Storage: Saves results to SQLite database
5. Export: Generates reports in various formats

🛡️ Security Considerations

• Rate Limiting: The tool includes delays and respects service limits
• Error Handling: Graceful handling of timeouts and errors
• Logging: Detailed logs for audit trails
• Non-Intrusive: Uses standard HTTP requests without authentication to do anonymous enumeration

⚠️ Important: Always ensure you have proper authorization before scanning any resources. Unauthorized scanning may violate terms of service or applicable laws.

🐛 Troubleshooting

Debug Mode

You can enable verbose logging for detailed information, but it can be a bit much:

python ateam.py -f resources.txt -v

Memory Issues with Permutations

If you experience "killed" messages when using permutations, try reducing the batch size:

python ateam.py -f resources.txt -p -b 100 -w 5

This processes resources in smaller batches with fewer concurrent workers to prevent memory exhaustion.

🤝 Contributing

Contributions are welcome! Please feel free to submit:

• Bug reports
• Feature requests
• Code improvements
• Documentation updates

Related Blogs

• We Know What You Did (in Azure) Last Summer

Presentations

• We Know What You Did (in Azure) Last Summer - DEF CON 33 - Cloud Village
  • Slides