MAL-2026-13525 Malicious code in bigops-security (npm)
Malicious package
Published
MAL-2026-13525 is a malicious package: bigops-security (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-2026-13525/ (Markdown: https://insights.sbomify.com/MAL-2026-13525/index.md)
- Package
- bigops-security
- Registry
- npm
What is MAL-2026-13525?
MAL-2026-13525 is a malicious package in bigops-security, published on 7 Aug 2026.
Official description
On require('bigops-security'), index.js loads bridge.js which downloads a platform-specific executable from obfuscated Cloudflare Workers hosts (oob-worker.cf10{0..3}-*.workers.dev) with a DNS-TXT chunked-base64 fallback via *.dl.wel1.ru subdomains. Destination hostnames are reconstructed at runtime from split string arrays (e.g. ['sdk','.dl.','wel1.','ru'].join('')) rather than appearing as plain literals. The fetched bytes are written to /tmp or %TEMP% under disguised names such as dotnet_diag<hex>.exe and.cache_<hex>, chmod 755'd, and detach-spawned via spawn('/bin/sh',…) or spawn('cmd',…) at _bridge.js:121-127. Cover-story identifiers ("analytics", "telemetry", "CDN", "Respect opt-out") frame the code as benign while the actual behavior is fetch-and-execute of an opaque binary from author-controlled infrastructure. No native-build purpose is present in the tarball; the package advertises itself as a security module.
What should I do about MAL-2026-13525?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.