telegram-bot-security-analysis

Telegram Bot Security Analysis

Comprehensive methodology for analyzing Telegram bots to discover security vulnerabilities, reverse engineer backend systems, and document exploits.

Core Workflow

1. Initial Reconnaissance

Login and Access:

from telethon import TelegramClient

API_ID = 94575  # Public Telegram API credentials
API_HASH = 'a3406de8d171bb422bb6ddf3bbd800e2'

client = TelegramClient('session_name', API_ID, API_HASH)
await client.start()

Bot Information Gathering:

• Bot ID and access hash
• Available commands
• Button callback data
• Web app URLs
• Inline query support

Command Discovery:

commands = [
    '/help', '/menu', '/balance', '/wallet', '/deposit', 
    '/withdraw', '/profile', '/settings', '/admin', '/debug'
]

for cmd in commands:
    await client.send_message(bot, cmd)
    await asyncio.sleep(1)

Conversation Dump:

all_msgs = await client.get_messages(bot, limit=200)

conversation = []
for msg in reversed(all_msgs):
    if msg.text:
        sender = "BOT" if msg.from_id == bot.id else "USER"
        conversation.append({
            "sender": sender,
            "time": msg.date.strftime('%Y-%m-%d %H:%M:%S'),
            "text": msg.text,
            "buttons": [[btn.text for btn in row] for row in msg.buttons] if msg.buttons else None
        })

2. Deep API Analysis

Intercept Callback Data:

from telethon.tl.functions.messages import GetBotCallbackAnswerRequest

# Get button callback data
for button in msg.reply_markup.rows:
    if hasattr(button, 'data'):
        callback_data = button.data.decode('utf-8', errors='ignore')
        print(f"Callback: {callback_data}")

Extract Web App URLs:

# Check for magic links, payment URLs, admin panels
for button in msg.buttons:
    if hasattr(button, 'button') and hasattr(button.button, 'url'):
        url = button.button.url
        if 'magic' in url or 'admin' in url or 'api' in url:
            print(f"Suspicious URL: {url}")