MAL-2026-2946 Malicious code in moonbit-metrics-validator (PyPI)

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