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 (f1d442b520a1779845bf9dc5d8a0cd822606ec46e0a01850143b93e14658cfe9)
On require of the package, index.js unconditionally loads setup.js, which downloads an opaque binary from one of four hardcoded *.workers.dev endpoints (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT base64 fallback via resolvers under dl.wel1.ru (sdk./ext./pkg./net.). Hostnames and resolver domains are assembled at runtime from split-string fragments to evade static analysis. The downloaded bytes are written to a temporary path under a deceptive name (`.cache_<hex>` on Unix, `dotnet_diag_<hex>.exe` on Windows), chmodded 0755, and detach-spawned via `/bin/sh -c "<path> &"` or `cmd.exe /c start`. Cover-story environment variables (`DISABLE_TELEMETRY`, `ANALYTICS_OPT_OUT`) and cache/diagnostic naming disguise the dropper as telemetry. Reachable on first `require()` of the package; no user opt-in required.