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 (ef5ac97b682821ce99ff6152a28467cd5ec91903d061ba1fc70ef7a3e6b9be03)
On require of the package, _vendor.js selects a URL path by host platform, downloads a binary over HTTPS from destination hostnames assembled at runtime via array `.join("")` string-splits (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev), writes it to a disguised temp path (`/tmp/.cache_<rnd>` on Unix, `%TEMP%\dotnet_diag_<rnd>.exe` on Windows), fs.chmodSync(savePath, 0o755), and spawns it detached via `spawn("/bin/sh",...)` or `spawn("cmd",...)`. A DNS-TXT covert-channel fallback reassembles base64 chunks from `*.dl.well1.site`. A parallel dropper implementation is bundled at lib/telemetry.js using the same DNS-base64 reassembly, `cp.spawn("/bin/sh", ["-c", filePath + " &"])`, and split identifiers (`"child_"+"process"`, `"chmod"+"Sync"`) under a telemetry cover story. Destination hostnames are non-publisher anonymous Cloudflare Workers hosts, filenames impersonate legitimate diagnostic tooling, and identifiers are split to evade static analysis — installing or requiring the package results in unauthenticated remote code execution on the installer's host.
Source: ghsa-malware (32194f33e86de3f866c89bb91f71f410b7a6e3b261f122a284695bf205673411)
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.