python-module-installer

Details

**Severity:** Critical

**Affected versions:** `= 3.15.6`

## Source: kam193 (61bfa181c5afb9e33e0d529138c813fc05d8130062182d9d1a5cb4ef9c8da0ea)
The package clones a legitimate webdavclient3 library and modifies it to be an installer utility. During installation, the package exfiltrates the current working directory to a remote WebDAV server or Telegram Bot. Additionally, the package targets cryptocurrency operations in another suspicious project, https://github.com/fewcatltd/zkSync/

The install_modules() method injects code into two files, which are characteristic for this repository, and causes exfiltrating configuration files during cryptocurrency exchange operations.


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


Campaign: 2026-03-old-python-module-installer


Reasons (based on the campaign):


 - impersonation


 - dependency-confusion


 - files-exfiltration


 - action-hidden-in-lib-usage


 - clones-real-package


 - crypto-related


 - exfiltration-crypto

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/python-module-installer/MAL-2026-1263.json))

**References:**
- https://github.com/Python-source-dev/python-module-installer/commit/f58c60b95e98dc9ae8f0fb03ed8eaa5fa23e14cf
- https://bad-packages.kam193.eu/pypi/package/python-module-installer
- https://github.com/Python-source-dev/python-module-installer
- https://github.com/fewcatltd/zkSync
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/python-module-installer/MAL-2026-1263.json
- https://github.com/python-requirements/requirements
- https://github.com/advisories/GHSA-j3ch-3jf2-gxgg

Compromised versions (1)

• = 3.15.6

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