If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
Source: amazon-inspector (0ec351f143fde732be84b60d329ba254cda918df3ebb25882371a8c5d96a3dd0)
On require of the package, index.js loads _ext.js which downloads an opaque platform-specific binary from one of four hardcoded Cloudflare Workers hosts (oob-worker.cf*.workers.dev), with a DNS-TXT chunked base64 fallback via *.dl.wel1.ru resolvers. Hostnames are reassembled at runtime via Array.join to evade static inspection. The fetched payload is written to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755'd, and spawned detached via /bin/sh -c "<path> &" or cmd.exe /c start /b, then unref()'d. A second module lib/telemetry.js bundles the same dropper primitives (child_process spawn, fs.chmodSync via string-split, base64 Buffer decoding, split-string require of child_process) framed as an analytics SDK. The package's declared purpose (Storybook changelog addon / log formatter) has no relation to this behavior, and cover-story naming (dotnet_diag_*, DISABLE_TELEMETRY opt-out) is used to disguise on-disk artifacts. Package name resembles legitimate Storybook addons.