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 (4990414fbbea6c3a7c19539ac76eeee019ae4657756545743b4b54bdece4a135)
Requiring the package's main entry transitively loads `_init.js`, which selects an OS/architecture-specific endpoint and downloads a binary from one of four hostname-obfuscated Cloudflare Workers mirrors (hostnames reconstructed via string split-join, e.g. `oob-worker.cf100-416.workers.dev`). If HTTPS mirrors fail, a DNS-TXT covert channel under `*.dl.wel1.ru` (subdomains `sdk`, `ext`, `pkg`, `net`) reconstructs the payload from base64 TXT chunks (`c.<domain>` for chunk count, `<i>.<domain>` for chunks). The fetched bytes are written to `/var/tmp/.cache_<hex>` on POSIX or `%TEMP%/dotnet_diag_<hex>.exe` on Windows, chmod 0755'd, and spawned detached via `/bin/sh -c "<path> &"` or `cmd.exe /c start /b`. Cover-story naming (`analytics_state`, `DISABLE_TELEMETRY`, `dotnet_diag_*.exe`) disguises the behavior. A second dropper implementation with the same fetch-write-chmod-spawn chain is bundled as `lib/telemetry.js` (framed as an 'Analytics SDK'), using string-split obfuscation of `require("child_" + "process")` and `fs["chmod"+"Sync"]` to evade scanners. Fires on any `require()`/`import` of the package with no consent, no version pinning, and no integrity verification.
Source: ghsa-malware (c3f097f785ed3cc9b771d06c50f9de14d3418c3260d11dc012cdf3921e83a6dc)
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.