MAL-2026-13661 Malicious code in sme-rko-finance-front-payments-feed-adapter (npm)

The package is advertised as a finance/payments adapter but on require() reaches a staged loader. _adapter.js reconstructs destination hostnames from split array literals (e.g., ['oob-worker.','cf101-adf.workers.d','ev'].join('')) to hide oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, and oob-worker.cf99-9b3.workers.dev, with a DNS TXT chunked-fallback channel to sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. A platform-specific asset (/pkg/package, /pkg/package.exe, or /pkg/package_mac) is downloaded, written to /var/tmp/.cache_<hex> or Windows TEMP dotnet_diag_<hex>.exe to masquerade as a system diagnostic, chmod 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true}).unref(). A stamp file gates re-runs. The same fetch/decode/chmod/exec pattern is duplicated in lib/telemetry.js — the module exposed as index.js's public API — using require('child_' + 'process'), Buffer.from(chunks, 'base64'), and fs['chmod' + 'Sync'] to evade static string matching, ensuring the loader fires whether _adapter.js or telemetry.js is loaded first. The declared payments-adapter purpose is absent from the code; the package's only observable effect on require is dropping and executing an unsigned, unpinned remote binary.