sys-extracter's Introduction

Sys-Extracter

This is the cross platform framework to recover driver's dispatch routine and all constraints for valid IOCTL codes.

It based on IREC and improve the IREC's limitations.

Installation & Getting Start

# make virtual environment
pip uninstall virtualenv
pip install virtualenv
sudo apt install python3-virtualenv -y

virtualenv sangjun
source sangjun/bin/activate

pip install angr

python3 sys-extracter.py -driver target_driver.sys

Example Result

Dispatch Routine

Recovered IOCTL Constraints

Implements of IREC

Recovering IOCTL as well as other dispatch routine

Fix the finding method of Recovering OutputBufferLength & InputBufferLength Constraints

When OutputBufferLength < 8, it is invalid constraints but IREC have mistake analyze it.

Sys-Extracter

    {   'InBufferLength': ['0-inf'],
        'IoControlCode': '0x7405c',
        'OutBufferLength': ['8-inf']},

IREC

  {   'InBufferLength': ['0-inf'],
        'IoControlCode': '0x7405c',
        'OutBufferLength': ['0-7']},

I fix this issue, so it can discover untainted code blocks.

IREC find the ended first Simstate and consider it is invalid constraints. But that has a error when All Simstate end same level.

So My Finder check IRP.IoStatus.Status fields and consider invalid constraints based on the NT_STATUS Code

NT_SUCCESS(Status)
Evaluates to TRUE if the return value specified by Status is a success type (0 − 0x3FFFFFFF) or an informational type (0x40000000 − 0x7FFFFFFF).

NT_INFORMATION(Status)
Evaluates to TRUE if the return value specified by Status is an informational type (0x40000000 − 0x7FFFFFFF).

NT_WARNING(Status)
Evaluates to TRUE if the return value specified by Status is a warning type (0x80000000 − 0xBFFFFFFF).

NT_ERROR(Status)
Evaluates to TRUE if the return value specified by Status is an error type (0xC0000000 - 0xFFFFFFFF).

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