MAL-2026-12230 Malicious code in tinkoff-boxy-desktop-two-panel-right-image (npm)

On require of this package, index.js loads vendor.js which detects the host OS/arch, assembles destination hostnames from split string fragments (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), downloads a platform-specific binary via https.get, and falls back to a covert channel that reconstructs a base64 payload from numbered DNS TXT records under tin.dl.well1.site / tina.dl.well1.site / ldr.dl.well1.site / win.dl.well1.site. The retrieved bytes are written to /tmp or %TEMP% under decoy names such as.cache<hex> or dotnet_diag_<hex>.exe, chmod 0755, and spawned detached via spawn('/bin/sh', ['-c', <path>+' &']) or cmd.exe /c start /b. A second module lib/telemetry.js, framed as an analytics SDK, ships the same base64-decode / chmodSync 0755 / detached spawn chain. The destinations are anonymous Cloudflare Workers subdomains and an unrelated DDNS-style domain; the fetched content is opaque native code executed on the installer's host with no verification.

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.