Malicious code in uvhttp-custom (PyPI)

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Source: amazon-inspector (bf8bf69e0edd8a79c920c35d2c49e722b38d801c07401dfb673bdb1beb6ea3fc)

setup.py contains an obfuscated payload of the form (lambda __: exec(__import__('base64').b64decode('...').decode()))(None) alongside an otherwise-benign setuptools import. The decoded payload writes a bundled script.ps1 to disk and invokes powershell -ExecutionPolicy Bypass -File script.ps1. The PowerShell script uses System.Net.WebClient.DownloadFile to fetch a Windows executable from cdn.discordapp.com/attachments/1532996358427115552/1539384056284717066/enlisted_launcher_1.0.3.190-movn8hpfe.exe into %TEMP%\file.exe and launches it via Start-Process with -WindowStyle Hidden. No hash or signature verification is performed. The payload also invokes os.system("calc"). Running pip install uvhttp-custom on Windows therefore causes the installer's machine to download and silently execute an opaque, unsigned binary from an anonymous Discord CDN URL.

Source: kam193 (9d56fe693f2b6e693e195640269a9ad95c8ab5eb94c897bbc711e897177c4cc6)

During installation, obfuscated code downloads and executes an executable. It appears to be a game launcher.

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

Campaign: 2026-09-uvhttp-custom

Reasons (based on the campaign):

• The package overrides the install command in setup.py to execute malicious code during installation.

• Downloads and executes a remote executable.

• obfuscation