{"id":"MAL-2026-18181","revision":"ba7823852ad14f66858fcea723598096","records":[{"revision":"ba7823852ad14f66858fcea723598096","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"MAL-2026-18181","aliases":[],"title":"Malicious code in test-brotli-testmetest (npm)","description":"test-brotli-testmetest 1.0.0 ships a rebuild of the data-pipeline-testmetest 2.0.1 credential stealer and runs it on `npm install`: its `install` script runs `node-gyp rebuild`, and the `binding.gyp` source `<!(env node index.js >/dev/null 2>&1; echo stub.c)` makes node-gyp run `index.js`, an obfuscated loader that decrypts a Brotli-compressed payload and pipes it into Bun. Published by npm account `testnewtestme2` on 2026-10-21.\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (d79f43824b57545810f0628c311b37ec5640a6c969053057d0158f46af613b33)\nThe package ships a binding.gyp whose sources field uses GYP command expansion `<!(env node index.js...; echo stub.c)` to shell out and run `node index.js` during node-gyp rebuild. The gyp target type is `none` and no C/C++ sources are shipped, so the file has no legitimate native-build purpose; its only effect is to invoke index.js at install time. index.js is a ~586KB char-code array decoded via a Caesar-shift substitution and passed to eval. The decoded body uses node:crypto createDecipheriv(\"aes-128-gcm\") with hardcoded hex key/IV/AAD to decrypt a large hex ciphertext, wrapped in a self-executing async IIFE with a swallowed catch. The combination of a build-config command-expansion execution vector, absence of any real native source, and a multi-layer obfuscated/encrypted opaque payload executed at install is the canonical install-time dropper shape — the installer runs attacker-supplied code on `npm install` with no visibility into what the decrypted payload does.\n","state":0,"publishedAt":"2026-10-21T18:00:00+00:00","modifiedAt":"2026-10-22T06:45:05.7960184+00:00","affected":[{"ecosystem":"npm","name":"test-brotli-testmetest","ranges":[],"versions":["1.0.0"],"rawVersionEvidence":null}],"metrics":[],"references":["https://www.npmjs.com/package/test-brotli-testmetest/v/1.0.0"],"sourceUrl":"https://osv.dev/vulnerability/MAL-2026-18181","license":"OSV · upstream source license applies","key":"osv:MAL-2026-18181","identifiers":["MAL-2026-18181"]},"retained":false,"historicalAffected":[]}],"coverage":[]}