MAL-2026-12150 Malicious code in bigops-auth-cache (npm)
Malicious package
Published
MAL-2026-12150 is a malicious package: bigops-auth-cache (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-2026-12150/ (Markdown: https://insights.sbomify.com/MAL-2026-12150/index.md)
- Package
- bigops-auth-cache
- Registry
- npm
What is MAL-2026-12150?
MAL-2026-12150 is a malicious package in bigops-auth-cache, published on 5 Aug 2026.
Official description
On require('bigops-auth-cache'), index.js loads compat.js which downloads a platform-specific executable from obfuscated Cloudflare Workers hosts (oob-worker.cf*.workers.dev) and *.dl.wel1.ru domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), writes it to a temp file with a disguised name (dotnet_diag.exe /.cache_), chmods 0755, and spawns it detached via cmd.exe or /bin/sh (_compat.js line 124-130). Hostnames are assembled at runtime from split-string arrays (['sdk.dl.w','el1','.ru'].join('')) to evade static detection. A DNS TXT-record covert channel serves as fallback payload delivery: a count record at c.<domain> and chunked base64 payload at N.<domain> are reassembled and executed. No hash or signature verification. Cover-story comments describe the code as 'analytics' / 'telemetry' / 'session management', contradicting the observed dropper behavior.
What should I do about MAL-2026-12150?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.