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pypi · Malicious package advisory

Malware

ultrafasttelethon

MAL-2025-191915

Malicious code in ultrafasttelethon (PyPI)

Details


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## Source: kam193 (73a960b0cd2d21f8bde61f22f956a4c2a02ccddd9e1277eef23d3d8e0406cba4)
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

Compromised versions (4)

  • 1.39.0
  • 1.39.0.1
  • 1.39.0.2
  • 1.39.0.3

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.