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KO

MAL-2026-12304

Malicious code in twork-mf-sandbox (npm)

Details

--- _-= Per source details. Do not edit below this line.=-_

## Source: amazon-inspector (3c6ce8fa08d31308e00adae0366018f14c4518e234073d99b996212b82cfccd1) On require of twork-mf-sandbox, index.js loads _bridge.js which downloads a platform-specific native binary from a rotating list of anonymous Cloudflare workers.dev hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT base64 fallback to tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The downloaded payload is written to a hidden path (/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh or cmd.exe. Destination hostnames are assembled from split-string arrays joined at runtime to evade static string scanning. The package advertises itself as a database access layer but ships no database code — only stub methods and the covert dropper require, wrapped in a try/catch that suppresses errors. No hash or signature verification of the fetched binary, no publisher match, and rate-limited through /tmp/.analytics_state to reduce detection.

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Affected packages

npm / twork-mf-sandbox

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References