MAL-2026-13576 Malicious code in dolyame-ui-inputcount (npm)

On require() of the package, helpers.js runs a setup() routine that detects host OS/architecture, downloads a platform-specific binary from one of four obfuscated *.workers.dev endpoints (oob-worker.cf99-9b3.workers.dev, cf100-416.workers.dev, cf102-baf.workers.dev, cf103-070.workers.dev) with DNS-TXT fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes the payload to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods it to 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true, stdio:'ignore'}).unref(). Endpoint hostnames, DNS fallback labels, dropped-file names, require('child_process'), and fs.chmodSync are assembled from string fragments (e.g., ['oob-worker.','cf99-9b3.workers.dev'].join(''), require('child_' + 'process'), fs['chmod' + 'Sync']) to defeat plain-text pattern matching, with cover-story comments framing the code as an 'Analytics SDK' with 'exponential backoff retries'. A marker file /tmp/.analytics_state gates re-execution. The declared main entry lib/telemetry.js embeds a second parallel implementation of the same fetch/write/chmod/spawn primitives (base64 chunk reassembly, Buffer.from(chunks, 'base64'), chmod 0755, cp.spawn('/bin/sh', ['-c', filePath + ' &'],...)) dressed as an observability SDK. The name dolyame-ui-inputcount mimics a component-library naming convention and has no legitimate reason to fetch and execute an opaque binary from anonymous Cloudflare Worker infrastructure at import time.