devplatform-nx-reactnpm

The package advertises itself as 'reusable nx react components' but its index.js unconditionally requires support.js, which fetches and executes an attacker-controlled binary on load. Hostnames are assembled at runtime from split character arrays to evade static analysis: HTTPS mirrors resolve to oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, and oob-worker.cf103-070.workers.dev on Cloudflare Workers, with a DNS-TXT chunked fallback against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru (a count is read from c.<domain>, then N base64 TXT chunks are reassembled into an executable). The downloaded payload is written to a temp path with a randomized name, chmodded 0755, and spawned detached via spawn('/bin/sh', ['-c', fp+' &']) on Unix or cmd.exe /c start /b fp on Windows. Comments and identifiers ('analytics_state', 'dotnet_diag', 'telemetry', 'Cross-platform path resolution') act as cover for the loader. The dropper has no relation to the package's stated purpose, and no integrity check, pinning, or publisher-controlled source is present.

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.