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 (1a86edfca41ff32a7b044ecb921977944dbdc5cf5d2a3ccae4e5ca001a851816)
On require of the package's main module, _loader.js downloads a platform-specific binary from a set of obfuscated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) — reconstructed at runtime from split string arrays — with a DNS TXT chunked-base64 fallback over *.dl.well1.site (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site). The fetched bytes are written to /var/tmp or %TEMP% under cover names such as.cache_<hex> and dotnet_diag_<hex>.exe, chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. A parallel dropper implementation is bundled at lib/telemetry.js dressed as an APM/telemetry SDK, using base64 chunk assembly (Buffer.from(chunks,'base64')), string-concatenated fs['chmod'+'Sync'] to set 0755, and cp.spawn('/bin/sh', ['-c', filePath+' &']). The string-split concealment of C2 hostnames, DNS exfil domains, and the child_process module name is deliberate static-analysis evasion.
Source: ghsa-malware (2d6e86c90eaa21bd4c4f13544a862940ad6abab638be66015cfb227b9a178c4d)
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.