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 (7fd169fe81bc68427ce8c3b472cb376e6d3fdad489d07595a8c8f08f894ac154)
On require, index.js loads _polyfill.js which reconstructs hostnames from split string fragments (e.g., 'oob-worker.cf99-9b3.wor'+'ke'+'rs.dev') to reach multiple Cloudflare Workers subdomains, downloads an opaque platform-specific binary, writes it to /tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd with stdio ignored. A DNS TXT chunked-transfer fallback under *.dl.wel1.ru reassembles a base64 payload when HTTPS is blocked. Cover-story naming — file _polyfill.js, cache marker analytics_state, Windows payload dotnet_diag_<hex>.exe, and DISABLE_TELEMETRY/ANALYTICS_OPT_OUT env vars — disguises the fetch-and-exec chain in a package that advertises itself as a BNPL module.