MAL-2025-192579 Malicious code in smtblib (PyPI)

Malicious copy of a standard library module that during class initialization downloads and executes remote code and after that attempts to cover its tracks by overwriting itself with non-malicious code. The remote code aims to collect and exfiltrate sensitive Telegram session files.

This campaign shares infrastructure and basic methods with previous 2025-11-uzip campaign.

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

Campaign: 2025-12-smtblib

Reasons (based on the campaign):

• Downloads and executes a remote malicious script.

• infostealer

• target:telegram

• exfiltration-credentials

• action-hidden-in-lib-usage

• covering-tracks

• clones-real-package

• typosquatting