MAL-2026-12275 Malicious code in tinkoff-statist-browser-typed-client-sme.rko.origsmartphonepaytb.common.mobile.events (npm)

The package's index.js unconditionally requires./loader, which on load fetches a platform-specific executable from Cloudflare Workers endpoints (oob-worker.cf10{0-3}-*.workers.dev) with a DNS TXT fallback under *.dl.well1.site. Destination hostnames are reconstructed at runtime from arrays of substrings joined together to evade static analysis. The fetched binary is written to /tmp or %TEMP% under decoy names (dotnet_diag*.exe, analytics_state), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe, granting the remote operator arbitrary code execution on any host that installs or imports this package. The package name is a long typosquat-shaped identifier impersonating internal Tinkoff namespacing.

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.