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OpenAdvisories
Malicious MAL-2024-12270

fake-usreagant

PyPI package · versions 0.0.3

Reported Oct 8, 2024 · Updated Dec 12, 2025

If this package is installed

Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.

Details

Source: kam193 (ef713dc551a4b2eb9b0c94b270f4c214aa90e688076e15bb263b3bb5f3b8484b)
Package imitates the legitimate fake-useragent, however it has a few suspicious additions: fake.py L149 calls a function from 'urllib2' module, which contains a code attempting to JSON-deserialize encoded code. This is a pickle executing os.system(id), which of course isn't executed by json.loads, but would be by pickle. Also: action is suspicious, not really malicious, but the package is a clear typosquatting attempt.

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Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.

Campaign: 2024-10-old-fake-usreagant

Reasons (based on the campaign):

- action-hidden-in-lib-usage

- clones-real-package

- typosquatting

- dependency-confusion