MAL-2026-18109 Malicious code in rs-lookout-sandbox-poc (npm)
Malicious package
Published
MAL-2026-18109 is a malicious package: rs-lookout-sandbox-poc (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-18109/ (Markdown: https://insights.sbomify.com/MAL-2026-18109/index.md)
- Package
- rs-lookout-sandbox-poc
- Registry
- npm
What is MAL-2026-18109?
MAL-2026-18109 is a malicious package in rs-lookout-sandbox-poc, published on 20 Oct 2026.
Official description
On module load, index.js reads os.userInfo().username and issues an HTTPS GET to a hardcoded third-party collector at https://webhook.site/553dad0e-c841-46a8-b07d-213b52a24686/, transmitting the installer's local username to an anonymous external endpoint. The same top-level code performs AWS Instance Metadata Service reconnaissance against 169.254.169.254: it PUTs /latest/api/token to obtain an IMDSv2 session token and then GETs /latest/meta-data/iam/security-credentials/ to enumerate the IAM role attached to the host. Both behaviors fire automatically when the package is required, with no caller action.
What should I do about MAL-2026-18109?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.