pypi · Malicious package advisory
Malwarefastercoding
MAL-2026-6208
Malicious code in fastercoding (PyPI)
Details
---
_-= Per source details. Do not edit below this line.=-_
## 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.
---
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
Compromised versions (1)
- 1.0.0
Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.