Fritzl

Fritzl

• Frida hooks and helpers mostly aimed at finding crypto functions.

How to use

• Modify the index.js to suit your needs.
• Use npm install to install the dependencies.

Option 1: Modify Fritzl directly:

• Use frida-compile: node_modules/.bin/frida-compile index.js -o compiled.js.
• Load the compiled file: frida -f </path/to/someapplication> -F -l compiled.js.

Option 2: Include Fritzl

mkdir myproject \
    && cd myproject \
    && npm init -y \
    && npm install --save-dev frida-compile \
    && npm install --save-dev git+https://github.com/FrankSpierings/fritzl.git \
    && touch index.js

Example index.js:

"use strict";

const Fritzl = require('fritzl');

var Utils = Fritzl.Utils;
var Golang = Fritzl.Golang;

Fritzl.disablePinning();
Fritzl.hookDecryption();
Fritzl.hookEncryption();
Fritzl.hookHMAC();
Fritzl.hookKeygen();
Fritzl.hookGoEncryption();

global.Fritzl = Fritzl;
global.hd = Fritzl.hd;
global.ts = Fritzl.ts;

console.log('Regex example: ' + JSON.stringify(Golang.findSymbolsByPattern(/decrypt/i), null, 1));

• Compile: node_modules/.bin/frida-compile index.js -o compiled.js.
• Usage example: frida --no-pause -l compiled.js -f $(which curl) -- https://www.google.com

Notice

• Use the Utils.telescope and Utils.hexdump to find pointers in memory.
• You might be able to use the golang.js module to hook Golang executables (as long as that binary is linked to libc).

Steal

• Grab whatever you want or need from this code. I am a lousy developer, so I am sure you will improve it ;)

Screenshot