MAL-2026-6451
Malicious code in simple-node-calc-a (npm)
Details
--- _-= Per source details. Do not edit below this line.=-_
## Source: amazon-inspector (f9a86d4aeac1d4f5fc458b3058f4b13229cd2097c9d8e5cf3e4d45aa24980ad8) simple-node-calc-a@1.0.0 advertises itself as a pure-JS calculator but ships a binding.gyp that triggers node-gyp automatically during `npm install`. binding.gyp line 6 uses gyp's shell-expansion directive `"<!(node lodash-compiler.js && echo stub.c)"`, which executes the sibling file `lodash-compiler.js` in the installer's environment at configure time, before any user code runs. lodash-compiler.js is an 87 KB obfuscator.io-packed file (rotated 510-entry `_0x` string array, control-flow flattening, 2906 deobfuscation transforms) presented with a lodash custom-build banner but never declared as a dependency and never imported by index.js. The deobfuscated trailer resolves to `require('fs').writeFileSync('poc.txt', 'POC...')`, writing a file into the installer's current working directory outside the package's own folder. The combination — undocumented native-build hook in a package with no native code, heavily obfuscated payload reachable only via that hook, and a write to the installer's CWD — is a working install-time arbitrary-code-execution primitive. Today's payload drops a PoC marker file; the same channel can deliver any code the author chooses on subsequent versions.
Are you affected?
Enter the version of the package you're using.
Affected packages
No fixed version published yet for simple-node-calc-a (npm). Pin to a known-safe version or switch to an alternative.