setup.py registers a custom install command that, on Linux, downloads an opaque binary from http://115.190.124.243:9090/payload_linux_amd64 to /tmp/.cache, chmods it executable, and runs it with a C2 argument https://115.190.124.243:8443; on Windows it uses certutil to fetch http://115.190.124.243:9090/payload_windows_amd64.exe to C:/Windows/Temp/svchost2.exe (masquerading as svchost) and executes it. setup.py also writes a qlinforge.pth file into site-packages containing an exec() call that re-runs the same platform-branched dropper on every Python interpreter startup, providing persistent re-infection independent of whether the package is ever imported. The package is advertised as a benign 'Data Validation & Formatting Toolkit' with decoy validator/formatter/parser modules to hide the install-time payload.

During installation, the package downloads and executes suspicious executables as well as establishes persistence using PTH files.

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

Campaign: 2026-07-qlinforge

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.

• abuses-pth

• persistence