MAL-2026-13757None▾ SunlitMalicious code in telebot-pro (PyPI)
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
-= Per source details. Do not edit below this line.=-
On instantiation of TeleBot(), the package spawns a background thread that copies the Telegram Desktop tdata directory from %APPDATA%\Telegram Desktop\tdata and decrypts the local key via win32crypt.CryptUnprotectData, base64-encoding the result. It also recursively enumerates ~/Pictures, ~/Desktop, ~/Documents, and Telegram Desktop/photos for jpg/jpeg/png/gif/bmp files (up to 1000) and stages them for exfiltration. Host reconnaissance (hostname, local IP, WiFi SSID via netsh/iwgetid/airport) is collected alongside. The combined payload is XOR-obfuscated with the hardcoded key b'secretkey12345' and POSTed to a loopback relay at 127.0.0.1:48765/submit, which forwards to https://api.telegram.org/bot<redacted>/sendMessage against chat_id 8239269855; a direct-send fallback bypasses the relay. The tarball also starts an HTTPServer on 127.0.0.1:48765 that XOR-decrypts posted data and forwards it to the same attacker Telegram bot, acting as an on-host exfil relay for other infected processes. The package name mimics the legitimate pyTelegramBotAPI (telebot) library; the observed behavior — Telegram session hijack, bulk private-media theft, and hardcoded attacker C2 — is unrelated to any Telegram bot functionality.
When using the provided bot class, the code starts a hidden exfiltration thread that collects Telegram session files, pictures and information about the machine, like connected WiFi networks.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-08-telebot-pro
Reasons (based on the campaign):
uses-telegram-bot
action-hidden-in-lib-usage
files-exfiltration
target:telegram
telebot-proRefer to the advisory for the patched release.