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Dragodis

Dragodis is a Python framework which allows for the creation of universal disassembler scripts. Dragodis currently only supports IDA and Ghidra, but has plans to support additional disassemblers in the future. Dragodis only supports Python 3.

The name Dragodis comes from the combination of Dragoman, a professional interpreter, and Disassembler.

Dragodis was created due to a need of the ability to run IDA scripts in Ghidra. Many scripts for automated analysis will work fine in most disassemblers. Eliminating the need to use disassemblers which require licenses for automated analysis is ideal.

There are other benefits of a universal disassembler API as well. Many reverse engineers have a preferred disassembler. Dragodis allows for simple transfers of scripts between users of different disassemblers. Dragodis also aims to provide a cleaner and easier to use API than those provided by other disassemblers.

Install

Use pip to install dragodis:

pip install dragodis

Then follow the instructions here to install a backend disassembler.

Usage

To use Dragodis, simply pass in the path to your input binary file into either the IDA or Ghidra class. This will create an instance of the disassembler with the given input file analyzed.

import dragodis

with dragodis.Ghidra(r"C:\strings.exe") as ghidra:
    print(ghidra.get_dword(0x401000))

import dragodis

with dragodis.IDA(r"C:\strings.exe") as ida:
    print(ida.get_dword(0x401000))

A disassembler can also be run without using a context manager using the start() and stop() functions.

import dragodis

ghidra = dragodis.Ghidra(r"C:\strings.exe")
ghidra.start()
ghidra.get_dword(0x401000)
ghidra.stop()

Alternatively, you can use open_program() to choose the disassembler more dynamically by providing the disassembler name in the disassembler parameter or by setting the DRAGODIS_DISASSEMBLER environment variable.

import dragodis

with dragodis.open_program(r"C:\strings.exe", disassembler="ida") as ida:
    print(ida.get_dword(0x401000))

It is highly recommended to use the DRAGODIS_DISASSEMBLER environment variable to ensure your scripts are cross compatible without any modification. As well, to give the user the power to choose which disassembler they would like to use.

A "NotInstalledError" will be thrown if the disassembler chosen is not properly installed.

import os
os.environ["DRAGODIS_DISASSEMBLER"] = "ida"

import dragodis

with dragodis.open_program(r"C:\strings.exe") as dis:
    print(f"Disassembler used: {dis.name}")
    print(dis.get_dword(0x401000))

If you are locally within the disassembler's interpreter (the output window for IDA or pyhidraw interpreter in Ghidra) then you can initialize a disassembler object by directly acccessing the object:

# If in IDA
import dragodis
dis = dragodis.IDA()

# If in Ghidra
import dragodis
dis = dragodis.Ghidra()

We can also directly call scripts using the open_program() function locally in the disassembler. When this happens, the input file path provided must match the detected input file path by the disassembler.

Specifying Processor Type

The processor type can be specified during initialization of the Disassembler object or through open_program(). This can be useful when loading shellcode.

When using open_program() with any backend disassembler supported, use a dragodis.PROCESSOR_* flag which will get converted to a sane default for the respective disassembler.

import dragodis
with dragodis.open_program(r"C:\input.exe", processor=dragodis.PROCESSOR_ARM) as dis:
    ...

If using a specific disassembler, any option that disassembler supports can be passed in. (Consult the documentation for the respective disassembler to know how to format the argument.)

# IDA
import dragodis
ida = dragodis.IDA(r"C:\input", processor="arm:ARMv7-M")

# Ghidra
import dragodis
ghidra = dragodis.Ghidra(r"C:\input", processor="ARM:LE:32:v7")

Alternatively, we can automatically choose the correct processor for the default disassembler chosen by the user with some initial checks.

import dragodis

PROCESSOR = {
    dragodis.BACKEND_IDA: "arm:ARMv7-M",
    dragodis.BACKEND_GHIDRA: "ARM:LE:32:v7",
}[dragodis.BACKEND_DEFAULT]

with dragodis.open_program(r"C:\input", processor=PROCESSOR) as dis:
    ...

Disassembler API Translation Map

As a reference, the following tables provide a rough mapping between the general equivalent API calls for Dragodis and each supported disassembler.

NOTE: These are rough translations between equivalent disassembler API functions to help you transition from using either IDA or Ghidra to using Dragodis. They are not always direct translations. For brevity, some details and differences in results get glossed over here. Please see the source code for more information.

Basics

Data

Cross-References

Imports/Exports

Functions

Instructions

Operands

insn pulled as described above

Registers

Segments

Strings

* dis in the dragodis column represents the open disassembler object retrieved from dragodis.open_program()