MAL-2026-13097
Dashboard / Malicious Package / MAL-2026-13097
MAL-2026-13097
Summary: Malicious code in boxy-webpack-test-utils (npm)
Details: Source: amazon-inspector (0c209d103503640b71c427b13bc614b157bc1cbcd371c3a35a0f0b060d7f39de) On require() of the package, index.js loads _polyfill.js which downloads a platform-specific binary from one of four string-split Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, cf102-baf.workers.dev, cf103-070.workers.dev, cf99-9b3.workers.dev), with a DNS TXT-record fallback channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru that reconstructs a base64 payload from chunked TXT queries. The fetched binary is written to /tmp or %TEMP% under a disguised name (.cache_<hex> or dotnet_diag_<hex>.exe), chmod 0755, and spawned detached via /bin/sh -c or cmd. Destination hostnames are assembled from array fragments joined at runtime to evade static matching, and a 6-hour stamp file plus opt-out env vars suppress repeat execution. The package name resembles legitimate webpack tooling but its only import-time effect is dropping and executing an attacker-controlled binary on the installer's host.
Affected packages
Package
Name: boxy-webpack-test-utils
Purl: pkg:npm/boxy-webpack-test-utils
Affected ranges
Type: N/A
Events:
