multisPyPI
Advisory published Updated
multis is a confirmed malicious PyPI package (MAL-2025-191797) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.1, 1.0.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in multis (PyPI)
What this malware does
Infostealer with multiple possibilities, but not auto-activating on installation. There are already multiple attempts to publish it, with different innocent-looking names.
The campaign contains the with Infostealer itself and packages that include it as dependency and triggered.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2025-02-multis
Reasons (based on the campaign):
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infostealer
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The malicious code is intentionally included in a dependency of the package
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for multis (7 malicious versions).
If you installed it — respond
multis 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 multis 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)
Detect & block this
O3 blocks multis-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.