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 (91399b954849c3483787f47cb7a54ed5784aba889c1ccafc13ff2f037b21af64)
On require of the package's main entry, _loader.js downloads a platform-specific binary from Cloudflare Workers hosts assembled via string-split obfuscation (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS TXT-record fallback channel over sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru that reconstructs a base64 payload from numbered subdomains. The fetched bytes are written to a disguised path (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c '<file> &' or cmd.exe /c start /b. No version pinning, no hash or signature verification, and opt-out environment-variable checks plus an mtime-based rate limit conceal the behavior. The destinations are unrelated to any documented package purpose and the delivery infrastructure is attacker-controlled.