MAL-2026-18297 Malicious code in nebulallm (PyPI)

nebulallm 1.4.3 presents itself as an AI API client stub but ships a custom install command class in setup.py that executes on pip install. The install hook spawns regsvr32.exe with the squiblydoo LOLBin pattern (regsvr32 -s -i:<url> scrobj.dll) to fetch and execute a remote COM scriptlet from https://akinomoreno.pythonanywhere.com/faye on the installer's Windows host. The subprocess is launched with DETACHED_PROCESS and stdin/stdout/stderr redirected to DEVNULL, so the dropper runs silently and produces no output during pip install. The declared package functionality is unrelated to the install-time behavior, consistent with a dropper staged behind a cover-story package.

During installation package first downloads a JScript script, which then downloads the next malicious DLL.

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

Campaign: 2026-10-nebulallm

Reasons (based on the campaign):

• typosquatting

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

• Downloads and executes a remote executable.

• Downloads and executes a remote malicious script.

• malware