colorstack

Details

**Severity:** Critical

**Affected versions:** `= 0.1.0`

## Source: kam193 (e622a7f45c572488da7a3dcea95a8deb6a56b0dfd843cd85483373bd03fb8974)
The package hides code to download and execute a remote executable from a newly created fastsyncapi[.]com domain. It is disguised as a remote 'fast color helper,' as opposed to the local helper, also included in the code, that only mimics any functionality. The malicious part is not immediately active: to download the binary, a key is required, which was not included in the analyzed versions. The downloaded binary is executed, and at least in one case disguised as 'AppHostRegistrationVerifier'. The package is likely prepared for multi-stage infection, but the trigger code using it was not identified.


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


Campaign: 2026-07-colorstack


Reasons (based on the campaign):


 - Downloads and executes a remote executable.


 - action-hidden-in-lib-usage

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/colorstack/MAL-2026-10976.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/colorstack
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/colorstack/MAL-2026-10976.json
- https://github.com/advisories/GHSA-63gh-q97q-jmmg

Compromised versions (1)

• = 0.1.0

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