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 (4b04bc16010479f488969366f0af5596c33f668da075e09d5d1b8fad737f03cd)
On require of the package's main entry, _support.js executes at import time: it selects a platform-specific path, fetches an opaque native binary from one of four hardcoded Cloudflare workers.dev hosts (oob-worker.cf101-adf/99-9b3/100-416/103-070.workers.dev), with a DNS TXT covert-channel fallback at *.dl.wel1.ru, writes the bytes to /var/tmp or %TEMP% under disguised filenames (.cache_<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), sets mode 0755, and spawns the dropped file detached via /bin/sh -c or cmd.exe /c start. C2 hostnames are assembled from split string arrays (e.g. ['oob-worker.cf101-adf.worker','s.de','v'].join('')) to defeat static IOC extraction, and telemetry opt-out env vars are checked as cover. Dropped filenames impersonate system diagnostics artifacts. Requiring or installing this package results in download-and-execute of attacker-controlled native code on the installer's host.
Source: ghsa-malware (4cdb0ba7c13eb96c82c29d53786642ef0c7d738d10d0e2af5036b95740d24b3c)
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.