---
id: MAL-2026-13732
title: Malicious code in joule-btp-extension (PyPI)
summary: Malicious code in joule-btp-extension (PyPI)
severity: none
vendor: joule-btp-extension
product: joule-btp-extension
ecosystem: pip
affected:
  - joule-btp-extension
published: '2026-08-11'
updated: '2026-08-11'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/MAL-2026-13732'
references:
  - url: 'https://bad-packages.kam193.eu/pypi/package/joule-btp-extension'
  - url: 'https://pypi.org/project/joule-btp-extension/0.1.0/'
  - url: 'https://pypi.org/project/joule-btp-extension/0.1.6/'
  - url: 'https://pypi.org/project/joule-btp-extension/0.1.3/'
  - url: 'https://pypi.org/project/joule-btp-extension/0.1.4/'
  - url: 'https://pypi.org/project/joule-btp-extension/0.1.1/'
tags:
  - osv
  - pip
ingestedAt: '2026-08-11T19:17:08.914Z'
---

## Overview


---
_-= Per source details. Do not edit below this line.=-_

## Source: amazon-inspector (91439e7a69d936aa8a65b16561f48e9d9abab26fc8e3af4087da8d367cfd2210)
On pip install, setup.py runs a collect_and_exfiltrate() routine that reads /private/etc/passwd, /private/etc/hosts, and /private/etc/sudoers; captures selected environment variables (HOME, USER, LOGNAME, VIRTUAL_ENV, PATH, PIP_CACHE_DIR, npm_config_prefix, GIT_EDITOR); recursively globs the installer's $HOME and current working directory and reads up to 4096 bytes of each file; and additionally invokes os.system("cat /private/etc/passwd"). The collected data is JSON-serialized and POSTed via urllib to a hardcoded ATTACKER_URL (currently the placeholder http://127.0.0.1:4445/collect, with an author comment 'replace before deploying') using a spoofed 'User-Agent: pip/23.0' header to blend with pip traffic, and all exceptions are silently swallowed. setup.py also writes a marker file '.joule-btp-extension-was-here' into $VIRTUAL_ENV/bin, demonstrating write access to the installer's virtualenv bin directory for persistence. The package's own docstring declares it a proof-of-concept sandbox-escape supply-chain attack targeting SAP Joule Desktop on macOS; the PoC framing does not change what the code does on install: it harvests installer files and identity data and beacons them off-host.

## Source: kam193 (21a7a58b1f32893cafb7cd9a1b452c5e9138b8fa89c43ebef1b3722205f60596)
During installation, the code exfiltrates basic information and exfiltrates more information to a localhost service as well as starts a reverse shell there. It seems to be an internal test that was uploaded to a public repository.


---

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: 2026-08-joule-btp-extension


Reasons (based on the campaign):


 - The package contains code to create a reverse shell, allowing an attacker to execute any commands on the victim's machine.


 - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

## Source: ossf-package-analysis (65193272cd9bd3b918d955bb215650b6b89b171e458b3385819f989bc1128049)
The OpenSSF Package Analysis project identified 'joule-btp-extension' @ 0.1.6 (pypi) as malicious.

It is considered malicious because:

- The package communicates with a domain associated with malicious activity.


## Affected packages

- `joule-btp-extension`

## Remediation

Refer to the advisory for the patched release.