claudeopusfile

GHSA-jgm6-7jxr-97gx

Malicious code in claudeopusfile (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 0.1.1`

## Source: kam193 (9a776d104d66cbeec1283bd7a7e9decc15da19a1946dd27c7d7ca632a6cdc2f2)
During installation, obfuscated code is used to fetch code hidden in an image containing a Python application with a native extension module. This module holds an obfuscated infostealer which collects sensitive data and exfiltrates them to a C2 server retrieved from transaction history in the Polygon blockchain.


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


Campaign: 2026-09-donutautosellsrc


Reasons (based on the campaign):


 - infostealer


 - Downloads and executes a remote executable.


 - obfuscation


 - The package contains code to detect if it is running in a sandbox environment.


 - malware


 - native-extension


 - steganography


 - c2-in-blockchain

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/59089e70fdc813170283c9fe0c3b1cdd79a207be/osv/malicious/pypi/claudeopusfile/MAL-2026-18298.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/claudeopusfile
- https://github.com/ossf/malicious-packages/blob/59089e70fdc813170283c9fe0c3b1cdd79a207be/osv/malicious/pypi/claudeopusfile/MAL-2026-18298.json
- https://polygonscan.com/address/0x9c0a507300fd902787bb193d80fca5ce6e1bff9a
- https://www.virustotal.com/gui/file/d03c42c275f0dbc617428441508c49ae1adcbbc95af4eeb094bca4e4f8943f3e/detection
- https://github.com/ossf/malicious-packages/blob/d2ebcdbd276ec106f93da643ca28b4f44839a7c2/osv/malicious/pypi/claudeopusfile/MAL-2026-18298.json
- https://github.com/ossf/malicious-packages/blob/4f27542fecd13e7f077489c04a2f3503d1189f32/osv/malicious/pypi/claudeopusfile/MAL-2026-18298.json
- https://pypi.org/project/claudeopusfile/0.1.1
- https://pypi.org/project/claudeopusfile/0.1.2

Compromised versions (1)

= 0.1.1

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