MAL-2026-18343: Malicious code in numprint (PyPI)

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Source: amazon-inspector (b2767ab63222f7b2b6c76334822fb6e8c8b0385df53833206362fcf52f93392a) numprint 1.2.0 on PyPI could not be fully characterized from the available signals. No specific installer-harm fingerprint (hardcoded C2, credential path read, home-directory secret scan, install-time fetch-and-execute, dropper, backdoor, self-propagation) is concretely identified in this record. The package name resembles common numeric/printing utility names but no benign purpose is confirmed either.

Source: kam193 (ca6ff316077349c92e2d1e5d7c3683a16e6542b952d5c7fc8743efa5d4c80243) During installation the package starts a background process executing commands provided by the attacker. The C2 communication happens through a GitHub Gist.

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

Campaign: 2026-10-numprint

Reasons (based on the campaign):

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

- The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.

- rat