mlc-ai-nightlyPyPI
Advisory published Updated
mlc-ai-nightly is a confirmed malicious PyPI package (MAL-2025-1980) that steals credentials and exfiltrates sensitive data (malicious versions 0.0.1, 9.9.9, 9.9.99). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in mlc-ai-nightly (PyPI)
What this malware does
Installing the package exfiltrates information about the host, including environmental variables.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2025-01-mlc-ai-nightly
Reasons (based on the campaign):
-
The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
-
The package overrides the install command in setup.py to execute malicious code during installation.
-
exfiltration-env-variables
-
dependency-confusion
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for mlc-ai-nightly (3 malicious versions).
If you installed it — respond
mlc-ai-nightly 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 mlc-ai-nightly 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
Campaign
References
Credits
- Kamil Mańkowski (kam193)
- ReversingLabs · finder
Detect & block this
O3 blocks mlc-ai-nightly-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.