MAL-2026-12245 Malicious code in tinkoff-pfp-atom-desktop-carousel (npm)

On require of this package, index.js loads loader.js which selects a platform-specific asset path, downloads a native binary over HTTPS from randomized Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT chunked base64 fallback via tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The downloaded bytes are written to /tmp or %TEMP% under disguised names (.cache<hex>, dotnet_diag_<hex>.exe), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start. Host names, the child_process module reference (require("child_" + "process")), and the chmodSync call are reconstructed at runtime via string-split/join to defeat static scanners. A second dropper implementation is bundled at lib/telemetry.js (~81KB) reimplementing the same fetch-write-chmod-spawn chain with base64 chunk assembly. The package name impersonates a Tinkoff Bank internal scope. Installing or requiring this package yields remote code execution on the installer's host by attacker-controlled native binaries.

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.