MAL-2026-12157 Malicious code in bigops-chats (npm)
Malicious package
Published
MAL-2026-12157 is a malicious package: bigops-chats (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-2026-12157/ (Markdown: https://insights.sbomify.com/MAL-2026-12157/index.md)
- Package
- bigops-chats
- Registry
- npm
What is MAL-2026-12157?
MAL-2026-12157 is a malicious package in bigops-chats, published on 5 Aug 2026.
Official description
On require() of bigops-chats, index.js loads helpers.js which assembles C2 hostnames via array split-join obfuscation (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, with a DNS-TXT fallback under sdk.dl.wel1.ru), fetches a platform-specific binary from those hosts without hash or signature verification, writes it to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd with stdio ignored. A stamp file at /tmp/.analytics_state suppresses re-runs. The staged filename mimics dotnet diagnostic tooling and the behavior is framed as analytics with an env-var opt-out. Hostnames are not publisher-controlled infrastructure and the delivered bytes are opaque and unverifiable.
What should I do about MAL-2026-12157?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.