boxy-webpack-test-utils

{"modified":"2026-08-05T14:22:57Z","published":"2026-08-05T14:22:57Z","schema_version":"1.7.4","id":"MAL-2026-13097","summary":"Malicious code in boxy-webpack-test-utils (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (0c209d103503640b71c427b13bc614b157bc1cbcd371c3a35a0f0b060d7f39de)\nOn 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.\n","affected":[{"package":{"ecosystem":"npm","name":"boxy-webpack-test-utils"},"versions":["35.2.1"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"evidence_files":[{"path":"_polyfill.js","sha256":"dfc9b3cef8f9a35f977be671c885ed729d1cd62da908e0912a61dea91e424f61","tlsh":"9ca1b696019570094bb0dbe4ca178815f65ff6a33780c298fb9c64895f7352483b2efc"}],"package_integrity":[{"filename":"boxy-webpack-test-utils-35.2.1.tgz","hashes":{"sha1":"7ea45eded12a52aab4ea1c48257f718ba0aca75f","sha512_sri":"sha512-cm3zBvuXVhk6ZtTWrRBKxOhT73G1pN4YjuO06sHFJ6BHtDBxgFzIiRksf60dl9d4D/2SSFckMfY8577MK3+hVg=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/boxy-webpack-test-utils/v/35.2.1"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015279","import_time":"2026-08-05T15:19:42.210249316Z","modified_time":"2026-08-05T14:22:57Z","sha256":"0c209d103503640b71c427b13bc614b157bc1cbcd371c3a35a0f0b060d7f39de","source":"amazon-inspector","versions":["35.2.1"]}]}}