# MAL-2026-12171: Malicious code in bigops-informer (npm) - **Type:** Malicious package - **Package:** `bigops-informer` (npm) - **Published:** 5 Aug 2026 ## What is MAL-2026-12171? MAL-2026-12171 is a malicious package in bigops-informer, published on 5 Aug 2026. ### Official description On require(), index.js loads _bootstrap.js which reconstructs a set of destination hostnames from string-array joins (resolving to oob-worker.cf99-9b3.workers.dev, cf101-adf/cf102-baf/cf103-070.workers.dev, and sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru), downloads a platform-specific executable via https.get, writes it to a temp path under disguised names (dotnet_diag_*.exe /.cache_*), chmods it 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp+' &']) or spawn('cmd',...) on Windows. If the HTTPS mirrors fail, _bootstrap.js falls back to a DNS TXT covert channel: it resolves c. to get a chunk count, then resolves N. for each chunk, concatenates the base64 chunks, decodes them to a binary buffer, and writes+executes the result. The module also includes a TTL stamp and env-based opt-out checks consistent with hostile staging. ## What should I do about MAL-2026-12171? Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed. ## Fix prompt for AI coding agents ```text MAL-2026-12171 is a malicious package: bigops-informer (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-2026-12171/ (Markdown: https://insights.sbomify.com/MAL-2026-12171/index.md) ``` ## Sources - OSV: https://osv.dev/vulnerability/MAL-2026-12171 --- From sbomify Insights: https://insights.sbomify.com/MAL-2026-12171/ Summaries are generated and may contain mistakes; the official description above is the record.