---
id: MAL-2026-15935
title: Malicious code in proxycer (PyPI)
summary: Malicious code in proxycer (PyPI)
severity: critical
exploited: true
vendor: proxycer
product: proxycer
ecosystem: pip
affected:
  - proxycer
published: '2026-09-05'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T05:00:08.536330817Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/MAL-2026-15935'
references:
  - url: 'https://bad-packages.kam193.eu/pypi/package/proxycer'
  - url: 'https://pypi.org/project/proxycer/0.1.0/'
tags:
  - osv
  - pip
  - malware
ingestedAt: '2026-09-05T19:33:45.863Z'
---

## Overview


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

## Source: amazon-inspector (2286dac5be0a9e8cc2e7b1ff92253d4b09beb0c43d5e795b9b9ea1391e6f8764)
The package's top-level __init__.py imports starts.py, which is a single-line loader that reverses a ~100KB string literal, base64-decodes it, marshal.loads the result into a code object, and exec()s it. All actual functionality is concealed behind reversal + base64 + marshal bytecode obfuscation, with an empty README and empty PKG-INFO description. The obfuscated code object runs automatically on `import proxycer`, so any behavior it contains (credential access, outbound network, filesystem writes, persistence) executes on the installer's host without source visibility.

## Source: kam193 (c7f54d8a442ae6b7c359629af5db210aafade4776e03f44895e67923bd464e29)
The provided functionality hides code that exfiltrates files to a remote location.


---

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


Campaign: 2026-09-asti


Reasons (based on the campaign):


 - files-exfiltration


 - action-hidden-in-lib-usage


 - target:android



## Affected packages

- `proxycer`

## Remediation

Refer to the advisory for the patched release.