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Data Theft Repackaged: A Case Study in Malicious Wrapper Packages on npm
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
browserify-zlib
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The browserify-zlib npm package is a JavaScript implementation of zlib for the browser. It uses the pako library under the hood and is designed to be used with Browserify. It allows you to compress and decompress data using the zlib library in a way that is compatible with browser environments.
Compression
This feature allows you to compress data using deflate compression. The code sample demonstrates how to compress a string and encode it in base64.
var zlib = require('browserify-zlib');
var input = 'Hello World';
var compressed = zlib.deflateSync(input).toString('base64');
console.log(compressed);
Decompression
This feature allows you to decompress data that was compressed using deflate compression. The code sample demonstrates how to decode a base64 string and decompress it.
var zlib = require('browserify-zlib');
var compressed = 'eJzT0yMAAGTvBe8=';
var decompressed = zlib.inflateSync(Buffer.from(compressed, 'base64'));
console.log(decompressed.toString());
Pako is a high-speed zlib port to pure javascript that works in the browser. It is the underlying library used by browserify-zlib. Pako is generally faster than browserify-zlib because it is a lower-level library and does not include the additional Browserify wrapper.
This package is a backport of Node.js's zlib module for older versions of Node. It provides similar compression and decompression functionalities but is intended for server-side use in Node.js rather than in browsers.
Fflate is a high-performance, low-level compression library for JavaScript. It offers similar compression and decompression capabilities as browserify-zlib but focuses on speed and efficiency, often outperforming pako in benchmarks.
Emulates Node's zlib module for the browser. Can be used as a drop in replacement with Browserify and webpack.
The heavy lifting is done using pako. The code in this module is modeled closely after the code in the source of Node core to get as much compatability as possible.
https://nodejs.org/api/zlib.html
The following options/methods are not supported because pako does not support them yet.
params
methodMIT
FAQs
Full zlib module for the browser
We found that browserify-zlib demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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