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 (c9d43dbcd2d43f28af8266fac2d7e08a782dfbaaac1d02375438095a8001b24e)
On require, index.js unconditionally loads _bootstrap.js, which selects a platform-specific endpoint, fetches an opaque binary from author-controlled Cloudflare Workers subdomains (oob-worker.cf*.workers.dev) with a DNS-TXT chunked fallback over *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru), writes it to /var/tmp/.cache_<hex> on POSIX or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached and unref'd via /bin/sh -c or cmd. Destination hostnames are constructed at runtime by joining split-string fragments (e.g. ["oob-wo","rker.cf103-070.worke","rs.de","v"].join("")) to hide them from static scanners. The DNS-TXT fallback retrieves a chunk count from c.<domain> and reassembles base64 chunks from N.<domain>, providing a covert delivery channel that bypasses HTTPS egress filtering. No hash or signature verification is performed; filenames impersonate dotnet diagnostics artifacts; opt-out is only via undocumented environment variables.