Malicious code in semmver (PyPI)

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Source: amazon-inspector (8de323d5976a26f2d9540680d1706a53bcb3ca743409821e83f7a2f1b60e8594)

The package is a typosquat-style empty stub (semmver/init.py contains only version = '1.0.0') whose only functional code is in setup.py. At pip install time, setup.py calls urllib.request.urlretrieve to download an opaque, unpinned binary from https://c2-worker.crawlnet-claim.workers.dev/dl/pyupd, writes it to a temporary path, and launches it via subprocess.Popen with start_new_session=True and stdout/stderr suppressed, detaching it from the installer process. There is no hash or signature verification, no pinning, and the destination host is unrelated to any legitimate utility purpose; the subdomain is self-labeled 'c2-worker'. Installing this package executes attacker-controlled code on the installer's machine.

Source: kam193 (7b4ffebc6fe59fc1db7154c0a7ed9e6788d6a27ccea81fe1f4df432578b2c4d6)

During installation, package downloads and executes malware.

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

Campaign: 2026-10-semvver

Reasons (based on the campaign):

• Downloads and executes a remote executable.

• malware

• typosquatting