🛡️ MAL-2026-12274 — tinkoff-statist-browser-typed-client-sme

Malicious code in tinkoff-statist-browser-typed-client-sme.rko.conversionpayments.web (npm)

Source: amazon-inspector

On require of the package, index.js loads _bridge.js which selects a platform-specific binary URL and races HTTP GETs across three Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS TXT fallback via tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The destination hostnames are assembled at runtime by splitting strings and joining them to evade static scanners. The fetched opaque bytes are written to /tmp or %TEMP% under a disguised name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmod 0755'd, and detached-spawned via /bin/sh -c or cmd.exe /c start. lib/telemetry.js ships a second copy of the same write-chmod-spawn dropper, additionally hiding child_process behind require("child_" + "process") and fs["chmod" + "Sync"] method-name concatenation, and framing the payload as an analytics SDK. There is no pinning, no hash or signature verification of the fetched executable, and the destinations are author-controlled Cloudflare Workers subdomains obfuscated in source — behavior consistent with a supply-chain dropper delivering arbitrary attacker-controlled code to the installer's host on require.