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 (9ff3bed0d9c04b7357e684ac9feee57efd9dcfc6c5834dc352089b425e7577dc)
On require/import of the package, index.js loads setup.js at module top level, which assembles attacker-controlled hostnames from split string fragments (Cloudflare Workers subdomains such as oob-worker.cf10x-*.workers.dev, with a DNS-TXT fallback channel over *.dl.wel1.ru that reassembles a base64 payload from numbered TXT records). setup.js downloads a platform-specific binary via https.get with no hash or signature verification, writes it to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods it to 0755, and spawns it detached via /bin/sh -c or cmd. Innocuous filenames and telemetry/analytics framing mask the dropper behavior.