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OpenAdvisories
Malicious MAL-2026-6208

fastercoding

PyPI package · versions 1.0.0

Reported Jun 19, 2026 · Updated Jun 24, 2026

If this package is installed

Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.

Details

Source: amazon-inspector (1c302e448868fcff3110a45d20b53d9d887cfb5aa31bb66df90702f2767246b4)
The package exposes a single public function run() (re-exported from __init__.py) which, on Windows, downloads BackgroundSyncService.exe from https://raw.githubusercontent.com/manhhungdev0603/kl.py/refs/heads/main/BackgroundSyncService.exe, writes it to %PROGRAMDATA%\BackgroundSyncService\, and executes it via subprocess.Popen([local_filepath], shell=True) (fastercoding/core.py lines 7 and 21). The source is a personal GitHub user's repo named 'kl.py' on the mutable main branch with no hash or signature verification, and the dropped binary is given a system-service cover name ('BackgroundSyncService') and staged into PROGRAMDATA — shape consistent with a keylogger/persistence dropper. Package metadata is empty (no description, author, or homepage) and the package contains no other functionality — the dropper is the package's entire purpose. Any caller of the only advertised entrypoint executes attacker-controlled, mutable, unsigned code on their machine.

Source: kam193 (9dd11cd3c57bf0f46158fd84d7243184d4bd5780e17f49d90f1721e6d0a8f8a1)
The package contains code to download and run a malicious executable. The executable contains a remote access trojan controlled via Telegram bot, with capabilities like a keylogger, screen recording, command execution. It also attempts to gain persistence via startup registry keys.

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Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-06-fastercode

Reasons (based on the campaign):

- Downloads and executes a remote executable.

- peristence-autorun

- uses-telegram-bot

- keylogger

- rat

- spyware-like

Indicators of compromise

Shown defanged and not clickable. Search any indicator to find other packages using it.

URLs

  • hxxps://raw[.]githubusercontent[.]com/manhhungdev0603/kl[.]py/refs/heads/main/BackgroundSyncService[.]exe other packages →