Xori - Custom disassembly framework

Xori is an automation-ready disassembly and static analysis library that consumes shellcode or PE binaries and provides triage analysis data.

Architectures:

• i386
• x86-64

File Formats

• PE, PE+
• Plain shellcode

Current Features

• Outputs json of the 1) Disassembly, 2) Functions, and 3) Imports.
• Manages Image and Stack memory.
• 2 modes:
  • Light Emulation - meant to enumerate all paths (Registers, Stack, Some Instructions).
  • Full Emulation - only follows the code’s path (Slow performance).
• Simulated TEB & PEB structures.
• Evaluates functions based on DLL exports.
• Displays strings based on referenced memory locations.
• Uses FLIRT style signatures (Fast Library Identification and Recognition Technology).
• Allows you to use your own exports for simulating the PEB.
• Will detect padding after a non-returning call.
• Will try to identify function references from offsets.

What it doesn't do yet:

• The engine is interactive.
• Does not dump strings.
• Does not process non-executable sections.
• TEB and PEB are not enabled for non-pe files.
• Only some x86 instructions are emulated, not all.
• Patching and assembling.
• No plugins or scripting.

Documentation

Requirements

rustc 1.27.0

Install rust for OSX & Linux Distros

curl https://sh.rustup.rs -sSf | sh

Install rust for Windows

https://www.rust-lang.org/en-US/other-installers.html

Select:

• x86_64-pc-windows-gnu or
• x86_64-pc-windows-msvc (Visual Studio Build Tools Required)

Installation

1. Build Xori

This command will also create other binaries such as pesymbols ans peinfo.

git clone https://github.com/endgameinc/xori.git
cd xori
cargo build --release

2. Create xori.json config file

cp xori.json.example xori.json
[edit if desired]

3. (Optional) Build the symbols files

If you want to create your own symbol files you need to set the dll folders to where you stored your windows dlls.

"function_symbol32": "./src/analysis/symbols/generated_user_syswow64.json",
"function_symbol64": "./src/analysis/symbols/generated_user_system32.json",
"symbol_server": {
	"dll_folder32": "./dlls/32bit",
	"dll_folder64": "./dlls/64bit"

Run pesymbols to overwrite the function_symbol json

 ./target/release/pesymbols

Run

./target/release/xori -f test.exe

Run all tests

cargo test

Browser GUI

Chrome	Firefox	Safari	IE	Opera
Latest ✔	Latest ✔	Latest ✔	x	Latest ✔

Requirements

nodejs

yarn (optional for UI dev)

• On Ubuntu 18.04 you may need to apt install the following: curl git libssl-dev pkg-config build-essential npm

Build

cd gui
npm install

Run

In one terminal

cd gui
node src/server.js

In another terminal

cd gui
npm start

It will open your default browser to http://localhost:3000/. The backend API is listening on localhost:5000.