MAL-2026-12238 Malicious code in tinkoff-component-limits (npm)

The package presents itself as a Tinkoff SDK but ships no legitimate functionality. On require(), index.js loads shim.js, which selects a platform-specific payload path, downloads a binary over HTTPS from hardcoded, string-split Cloudflare Workers subdomains (oob-worker.cf1030-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT fallback across tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The fetched bytes are written to /var/tmp or %TEMP% under disguised names such as.cache<hex> and dotnet_diag_<hex>.exe, chmod 0755'd, and spawned detached via /bin/sh -c or cmd. Hostnames are assembled from split fragments at runtime to evade string scanning.

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.