MAL-2026-13489

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MAL-2026-13489

Summary: Malicious code in pydanticc (PyPI)

Details: Source: amazon-inspector (0bc3a091548db52bab3bf8556e95780b3041aa971b6353d7f31bdb71128915a1) pydanticc is a typosquat of the popular 'pydantic' package. Its setup.py defines a custom setuptools install command whose body is stored as a base64 string literal and reconstituted at install time via base64.b64decode + compile + exec, concealing the payload from plain reading of setup.py. On Linux, the decoded hook downloads an opaque executable from https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something (a personal GitHub account unrelated to the package's stated purpose), writes it to /tmp/something, marks it executable, and launches it detached via subprocess.Popen with start_new_session=True. The shipped Python module (djangoo/main.py) contains only a trivial hello() print with no pydantic-related functionality, so the package's real effect on installation is arbitrary remote code execution on the installer's host. The unpinned personal-account release URL, base64/exec obfuscation of the URL and Popen call, detached background execution, name-squat of a top-100 package, and stub content together constitute a classic install-time dropper. Source: kam193 (c16b176d1ba6ee3f4f1680d0678c9933e620f4de18bec7bc9af67978ed737527) Package imitates name of a popula library. During installation, obfuscated code downloads a malicious executable and starts it. It then exfiltrates at least cryptocurrency wallet data, probably more. Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2026-08-flasq Reasons (based on the campaign): - typosquatting - The package overrides the install command in setup.py to execute malicious code during installation. - exfiltration-generic - Downloads and executes a remote executable. - obfuscation - exfiltration-crypto

References: https://www.virustotal.com/gui/file/425f5336182e359211b5d751786d2ce1d31a673ea9c82107358a888803742649/detection, https://bad-packages.kam193.eu/pypi/package/pydanticc, https://tria.ge/260807-fkycrazzg1/behavioral1, https://pypi.org/project/pydanticc/0.3.0/, https://pypi.org/project/pydanticc/0.1.2/, https://pypi.org/project/pydanticc/0.2.0/, https://pypi.org/project/pydanticc/0.1.1/