Which versions of moonbit-metrics-validator are malicious?

The following PyPI versions of moonbit-metrics-validator are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate moonbit-metrics-validator if I installed it?

moonbit-metrics-validator is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed moonbit-metrics-validator — how do I know if it already compromised me?

If moonbit-metrics-validator 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 moonbit-metrics-validator part of a known attack campaign?

Yes — moonbit-metrics-validator is associated with the 2026-04-moonbit-locale-compat, RLMA-2026-02100 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 moonbit-metrics-validator across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for moonbit-metrics-validator (version 1.0.0).

Malicious package

moonbit-metrics-validatorPyPI

Advisory published Apr 20, 2026Updated Jul 9, 2026

moonbit-metrics-validator is a confirmed malicious PyPI package (MAL-2026-2946) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in moonbit-metrics-validator (PyPI)

MAL-2026-2946

Immediate action

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

pip uninstall moonbit-metrics-validator

What this malware does

Campaign includes a chain of dependencies that finally exfiltrate sensitive environment variables to a hardcoded GitHub repository as exfiltration target, and in specific environments also start a reverse shell. It appears to be targeting specifically one GitHub project, where the front-end package was included in a PR.

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

Campaign: 2026-04-moonbit-locale-compat

Reasons (based on the campaign):

The malicious code is intentionally included in a dependency of the package
The package contains code to create a reverse shell, allowing an attacker to execute any commands on the victim's machine.
exfiltration-env-variables

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

e6bb44c25db578131ec69b1c961c22f67cabb0b81aae5fe9d4620194bf8d83cc

76ebf99852d91f4d88a4f717b1aa730f494cb45a9b50308a1c2a1734137bedb8

9ced16886da66775b486e361bd0e52dc3343b093bcfa2783058d963da11de8fa

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for moonbit-metrics-validator (version 1.0.0).
If you installed it — respond
moonbit-metrics-validator is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If moonbit-metrics-validator 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. moonbit-metrics-validator on PyPI has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-04-moonbit-locale-compatRLMA-2026-02100

References

Credits

Kamil Mańkowski (kam193) · reporter
ReversingLabs · finder

Detect & block this

O3 blocks moonbit-metrics-validator-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database