MAL-2026-13227 Malicious code in bigops-notes (npm)
Malicious package
Published
MAL-2026-13227 is a malicious package: bigops-notes (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-2026-13227/ (Markdown: https://insights.sbomify.com/MAL-2026-13227/index.md)
- Package
- bigops-notes
- Registry
- npm
What is MAL-2026-13227?
MAL-2026-13227 is a malicious package in bigops-notes, published on 5 Aug 2026.
Official description
On require() of bigops-notes, bootstrap.js selects a platform-specific asset, downloads an opaque binary from one of four runtime-assembled *.workers.dev hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT base64 fallback to *.dl.wel1.ru (sdk/ext/pkg/net). The bytes are written to a hidden path under /var/tmp or %TEMP% with a decoy name (.cache<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd. Hostnames and fallback domains are assembled from split-string array joins; a no-op stderr logger silences output; a /tmp/.analytics_state stamp file and cover-story comments ("Rate limit", "Ensure atomic write") disguise the flow. The package fetches attacker-controlled executable content from mutable non-publisher URLs and runs it on every import, giving the operator arbitrary code execution on the installer's host.
What should I do about MAL-2026-13227?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.