Malicious code in fastapii (PyPI)

Overview

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Source: amazon-inspector (bf67e733322de0ce3d08269697e6ccd9460233319cadd5f97f05c8d1e855665a)

fastapii 0.1.2 is a single-character typosquat of the popular fastapi package. Its setup.py registers a custom setuptools install cmdclass (LinuxInstall) whose post_install step decodes a base64-encoded payload (_HOOK_B64) and runs it via exec(compile(...)). On Linux, the decoded payload calls urllib.request.urlretrieve to fetch a binary from https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something into /tmp, chmods it to 0755, and launches it detached via subprocess.Popen with start_new_session=True. The GitHub account hosting the binary is unrelated to the package's declared identity, the fetch is unpinned and unverified (no hash or signature), and the Linux-only gate means the payload stays dormant on many developer laptops but fires in Linux CI and production. The shipped module is a stub named djangoo containing only a trivial hello() function, and PKG-INFO/README metadata ('HTTP client utilities', '# requestss') further obscure the package identity — the install-time dropper is the package's sole real behavior.

Source: kam193 (ccfc3dd07e620dc6bda1b28b4d8f77932ee217aff579270c0e0c74453e215943)

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.

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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

Affected packages

• fastapii

Remediation

Refer to the advisory for the patched release.