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OpenAdvisories
Malicious MAL-2025-191723

fastertelethon

PyPI package · versions 1.0.5, 1.0.0

Reported Apr 4, 2025 · Updated Dec 31, 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 (3ccfc281c2541df7e1354e6de8c64624fdc75dcc229d33962b171b0a95087edf)
Clone of Telethon package that exfiltrates credentials. See client/telegrambaseclient.py L608-626 (exfiltration function) and client/auth.py L163 (usage).

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

Campaign: 2025-04-fastgram

Reasons (based on the campaign):

- clones-real-package

- action-hidden-in-lib-usage

- exfiltration-generic

Indicators of compromise

Shown defanged and not clickable. Search any indicator to find other packages using it.

Domains