MAL-2026-16264

Dashboard / Malicious Package / MAL-2026-16264

MAL-2026-16264

Summary: Malicious code in aiosendletter (PyPI)

Details: Source: amazon-inspector (29baa6f2cbfb2ef9907be7830505e33e82b5a1e6a45eb7f995022d09f5841f09) The package advertises itself as a 'safe bug reporter' but its init() function archives the contents of %LOCALAPPDATA%\logs with shutil.make_archive and POSTs the resulting archive to a hardcoded, non-configurable Cloudflare Workers endpoint at https://sparkling-pine-f202.stilluer-sweden.workers.dev/. The destination is author-controlled, the caller has no way to redirect or disable it, and code comments indicate the target directory is expected to include a Telegram bot token folder — the collected data is credential-adjacent local state leaving the installer's machine. On Windows the same function calls ctypes.windll.shell32.ShellExecuteW with the 'runas' verb to relaunch the interpreter under UAC elevation before performing the archive-and-upload, broadening the set of files reachable for collection. Separately, pyproject.toml declares 'ctypes' as a runtime dependency; ctypes is a Python standard-library module, so pip resolves this name against PyPI and installs whatever package is published there under 'ctypes', executing that third party's code at install time. The cover-story description, the hardcoded off-host destination for locally-collected data, the privilege escalation, and the stdlib-name dependency-confusion vector jointly constitute an active supply-chain attack on installers. Source: kam193 (4e81e3b63bbe719f6d0bdd42930bb2f3235b8e41cbacf449743bb7dca67c9f08) Package hides code to exfiltrate files. Most releases target unclear files, but some reveal the goal to exfiltrate sensitive Telegram data. Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2026-09-aiosendletter Reasons (based on the campaign): - files-exfiltration - target:telegram

References: https://bad-packages.kam193.eu/pypi/package/aiosendletter, https://pypi.org/project/aiosendletter/4.3/, https://pypi.org/project/aiosendletter/4.6/, https://pypi.org/project/aiosendletter/3.8/, https://pypi.org/project/aiosendletter/4.5/, https://pypi.org/project/aiosendletter/3.9/, https://pypi.org/project/aiosendletter/0.2.0/, https://pypi.org/project/aiosendletter/3.7/, https://pypi.org/project/aiosendletter/4.1/, https://pypi.org/project/aiosendletter/4.0/