MAL-2026-15863

Dashboard / Malicious Package / MAL-2026-15863

MAL-2026-15863

Summary: Malicious code in uvhttp-custom (PyPI)

Details: 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

References: https://www.virustotal.com/gui/file/100dddbee0589f1f78f7b78c9ec2b4c40d408ee01e6219a269e877940c992142/detection, https://app.any.run/tasks/980277ac-35c0-4d8a-ae88-d00702c16fcc, https://bad-packages.kam193.eu/pypi/package/uvhttp-custom, https://pypi.org/project/uvhttp-custom/1.8.1/, https://pypi.org/project/uvhttp-custom/1.9.9/, https://pypi.org/project/uvhttp-custom/1.7.9/