Which versions of CalcBoxLite are malicious?

The following PyPI versions of CalcBoxLite are flagged malicious: 1.0. Treat any of these as compromised.

How do I remediate CalcBoxLite if I installed it?

CalcBoxLite establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

I already installed CalcBoxLite — how do I know if it already compromised me?

If CalcBoxLite was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is CalcBoxLite part of a known attack campaign?

Yes — CalcBoxLite is associated with the IN-MAL-2026-018816 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find CalcBoxLite across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for CalcBoxLite (version 1.0).

Malicious package

CalcBoxLitePyPI

Advisory published Aug 28, 2026Updated Aug 28, 2026

CalcBoxLite is a confirmed malicious PyPI package (MAL-2026-15488) that opens a backdoor for remote access (malicious version 1.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in calcboxlite (PyPI)

MAL-2026-15488

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

pip uninstall CalcBoxLite

What this malware does

setup.py and calcboxlite/init.py both invoke a top-level _report() function that reads getpass.getuser() and socket.gethostname() and POSTs them as JSON to a hardcoded remote collector at https://k4m2qhx7ptv9nzcr3bwe8syd6ljfa0gu1.oast.invalid/collect. The beacon fires automatically on pip install and again on every import calcboxlite, so consumers in sandboxed builds, CI runners, REPLs, or downstream libraries all transmit installer identity to the endpoint. The destination host is unrelated to any advertised calculator functionality and is characteristic of an out-of-band interaction collector used for identifying vulnerable installers.

Malicious versions

1 flagged

1.0

Indicators of compromise (SHA-256)

227fe04d85516bd5348dea2c0c25078d057eacb4f439fd6a241ea0409b7afd09

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for CalcBoxLite (version 1.0).
If you installed it — respond
CalcBoxLite establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If CalcBoxLite was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. CalcBoxLite on PyPI has been identified as a malicious package (version 1.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-018816

References

pypi.org

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks CalcBoxLite-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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