Python代码封装的可执行exe文件反编译为Py脚本

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起因是笔者有个课，教图形图像学，作业的代码调不出老师的效果，于是就又有了hack的想法，把老师给的用来演示的exe文件反编译。主要是根据这篇文章的方法来的。将 exe 文件反编译成 Python 脚本_py_IA&IM的博客-CSDN博客

第一步

首先，在要反编译的exe文件所在路径，新建一个py脚本，然后把下面的代码复制进去，命名随便，记得住就行，比如我这里起名111.py

#!/usr/bin/python

"""
PyInstaller Extractor v1.8 (Supports pyinstaller 3.2, 3.1, 3.0, 2.1, 2.0)
Author : Extreme Coders
E-mail : extremecoders(at)hotmail(dot)com
Web    : https://0xec.blogspot.com
Date   : 28-April-2017
Url    : https://sourceforge.net/projects/pyinstallerextractor/

For any suggestions, leave a comment on
https://forum.tuts4you.com/topic/34455-pyinstaller-extractor/

This script extracts a pyinstaller generated executable file.
Pyinstaller installation is not needed. The script has it all.

For best results, it is recommended to run this script in the
same version of python as was used to create the executable.
This is just to prevent unmarshalling errors(if any) while
extracting the PYZ archive.

Usage : Just copy this script to the directory where your exe resides
        and run the script with the exe file name as a parameter

C:\path\to\exe\>python pyinstxtractor.py <filename>
$ /path/to/exe/python pyinstxtractor.py <filename>

Licensed under GNU General Public License (GPL) v3.
You are free to modify this source.

CHANGELOG
================================================

Version 1.1 (Jan 28, 2014)
-------------------------------------------------
- First Release
- Supports only pyinstaller 2.0

Version 1.2 (Sept 12, 2015)
-------------------------------------------------
- Added support for pyinstaller 2.1 and 3.0 dev
- Cleaned up code
- Script is now more verbose
- Executable extracted within a dedicated sub-directory

(Support for pyinstaller 3.0 dev is experimental)

Version 1.3 (Dec 12, 2015)
-------------------------------------------------
- Added support for pyinstaller 3.0 final
- Script is compatible with both python 2.x & 3.x (Thanks to Moritz Kroll @ Avira Operations GmbH & Co. KG)

Version 1.4 (Jan 19, 2016)
-------------------------------------------------
- Fixed a bug when writing pyc files >= version 3.3 (Thanks to Daniello Alto: https://github.com/Djamana)

Version 1.5 (March 1, 2016)
-------------------------------------------------
- Added support for pyinstaller 3.1 (Thanks to Berwyn Hoyt for reporting)

Version 1.6 (Sept 5, 2016)
-------------------------------------------------
- Added support for pyinstaller 3.2
- Extractor will use a random name while extracting unnamed files.
- For encrypted pyz archives it will dump the contents as is. Previously, the tool would fail.

Version 1.7 (March 13, 2017)
-------------------------------------------------
- Made the script compatible with python 2.6 (Thanks to Ross for reporting)

Version 1.8 (April 28, 2017)
-------------------------------------------------
- Support for sub-directories in .pyz files (Thanks to Moritz Kroll @ Avira Operations GmbH & Co. KG)


"""

"""
Author: In Ming Loh
Email: inming.loh@countercept.com

Changes have been made to Version 1.8 (April 28, 2017).

CHANGELOG
================================================
- Function extractFiles(self, custom_dir=None) has been modfied to allow custom output directory.

"""

import os
import struct
import marshal
import zlib
import sys
import imp
import types
from uuid import uuid4 as uniquename


class CTOCEntry:
    def __init__(self, position, cmprsdDataSize, uncmprsdDataSize, cmprsFlag, typeCmprsData, name):
        self.position = position
        self.cmprsdDataSize = cmprsdDataSize
        self.uncmprsdDataSize = uncmprsdDataSize
        self.cmprsFlag = cmprsFlag
        self.typeCmprsData = typeCmprsData
        self.name = name


class PyInstArchive:
    PYINST20_COOKIE_SIZE = 24           # For pyinstaller 2.0
    PYINST21_COOKIE_SIZE = 24 + 64      # For pyinstaller 2.1+
    MAGIC = b'MEI\014\013\012\013\016'  # Magic number which identifies pyinstaller

    def __init__(self, path):
        self.filePath = path


    def open(self):
        try:
            self.fPtr = open(self.filePath, 'rb')
            self.fileSize = os.stat(self.filePath).st_size
        except:
            print('[*] Error: Could not open {0}'.format(self.filePath))
            return False
        return True


    def close(self):
        try:
            self.fPtr.close()
        except:
            pass


    def checkFile(self):
        print('[*] Processing {0}'.format(self.filePath))
        # Check if it is a 2.0 archive
        self.fPtr.seek(self.fileSize - self.PYINST20_COOKIE_SIZE, os.SEEK_SET)
        magicFromFile = self.fPtr.read(len(self.MAGIC))

        if magicFromFile == self.MAGIC:
            self.pyinstVer = 20     # pyinstaller 2.0
            print('[*] Pyinstaller version: 2.0')
            return True

        # Check for pyinstaller 2.1+ before bailing out
        self.fPtr.seek(self.fileSize - self.PYINST21_COOKIE_SIZE, os.SEEK_SET)
        magicFromFile = self.fPtr.read(len(self.MAGIC))

        if magicFromFile == self.MAGIC:
            print('[*] Pyinstaller version: 2.1+')
            self.pyinstVer = 21     # pyinstaller 2.1+
            return True

        print('[*] Error : Unsupported pyinstaller version or not a pyinstaller archive')
        return False


    def getCArchiveInfo(self):
        try:
            if self.pyinstVer == 20:
                self.fPtr.seek(self.fileSize - self.PYINST20_COOKIE_SIZE, os.SEEK_SET)

                # Read CArchive cookie
                (magic, lengthofPackage, toc, tocLen, self.pyver) = \
                struct.unpack('!8siiii', self.fPtr.read(self.PYINST20_COOKIE_SIZE))

            elif self.pyinstVer == 21:
                self.fPtr.seek(self.fileSize - self.PYINST21_COOKIE_SIZE, os.SEEK_SET)

                # Read CArchive cookie
                (magic, lengthofPackage, toc, tocLen, self.pyver, pylibname) = \
                struct.unpack('!8siiii64s', self.fPtr.read(self.PYINST21_COOKIE_SIZE))

        except:
            print('[*] Error : The file is not a pyinstaller archive')
            return False

        print('[*] Python version: {0}'.format(self.pyver))

        # Overlay is the data appended at the end of the PE
        self.overlaySize = lengthofPackage
        self.overlayPos = self.fileSize - self.overlaySize
        self.tableOfContentsPos = self.overlayPos + toc
        self.tableOfContentsSize = tocLen

        print('[*] Length of package: {0} bytes'.format(self.overlaySize))
        return True


    def parseTOC(self):
        # Go to the table of contents
        self.fPtr.seek(self.tableOfContentsPos, os.SEEK_SET)

        self.tocList = []
        parsedLen = 0

        # Parse table of contents
        while parsedLen < self.tableOfContentsSize:
            (entrySize, ) = struct.unpack('!i', self.fPtr.read(4))
            nameLen = struct.calcsize('!iiiiBc')

            (entryPos, cmprsdDataSize, uncmprsdDataSize, cmprsFlag, typeCmprsData, name) = \
            struct.unpack( \
                '!iiiBc{0}s'.format(entrySize - nameLen), \
                self.fPtr.read(entrySize - 4))

            name = name.decode('utf-8').rstrip('\0')
            if len(name) == 0:
                name = str(uniquename())
                print('[!] Warning: Found an unamed file in CArchive. Using random name {0}'.format(name))

            self.tocList.append( \
                                CTOCEntry(                      \
                                    self.overlayPos + entryPos, \
                                    cmprsdDataSize,             \
                                    uncmprsdDataSize,           \
                                    cmprsFlag,                  \
                                    typeCmprsData,              \
                                    name                        \
                                ))

            parsedLen += entrySize
        print('[*] Found {0} files in CArchive'.format(len(self.tocList)))


    def extractFiles(self, custom_dir=None):
        print('[*] Beginning extraction...please standby')
        if custom_dir is None:
            extractionDir = os.path.join(os.getcwd(), os.path.basename(self.filePath) + '_extracted')

            if not os.path.exists(extractionDir):
                os.mkdir(extractionDir)

            os.chdir(extractionDir)
        else:
            if not os.path.exists(custom_dir):
                os.makedirs(custom_dir)
            os.chdir(custom_dir)

        for entry in self.tocList:
            basePath = os.path.dirname(entry.name)
            if basePath != '':
                # Check if path exists, create if not
                if not os.path.exists(basePath):
                    os.makedirs(basePath)

            self.fPtr.seek(entry.position, os.SEEK_SET)
            data = self.fPtr.read(entry.cmprsdDataSize)

            if entry.cmprsFlag == 1:
                data = zlib.decompress(data)
                # Malware may tamper with the uncompressed size
                # Comment out the assertion in such a case
                assert len(data) == entry.uncmprsdDataSize # Sanity Check

            with open(entry.name, 'wb') as f:
                f.write(data)

            if entry.typeCmprsData == b'z':
                self._extractPyz(entry.name)


    def _extractPyz(self, name):
        dirName =  name + '_extracted'
        # Create a directory for the contents of the pyz
        if not os.path.exists(dirName):
            os.mkdir(dirName)

        with open(name, 'rb') as f:
            pyzMagic = f.read(4)
            assert pyzMagic == b'PYZ\0' # Sanity Check

            pycHeader = f.read(4) # Python magic value

            if imp.get_magic() != pycHeader:
                print('[!] Warning: The script is running in a different python version than the one used to build the executable')
                print('    Run this script in Python{0} to prevent extraction errors(if any) during unmarshalling'.format(self.pyver))

            (tocPosition, ) = struct.unpack('!i', f.read(4))
            f.seek(tocPosition, os.SEEK_SET)

            try:
                toc = marshal.load(f)
            except:
                print('[!] Unmarshalling FAILED. Cannot extract {0}. Extracting remaining files.'.format(name))
                return

            print('[*] Found {0} files in PYZ archive'.format(len(toc)))

            # From pyinstaller 3.1+ toc is a list of tuples
            if type(toc) == list:
                toc = dict(toc)

            for key in toc.keys():
                (ispkg, pos, length) = toc[key]
                f.seek(pos, os.SEEK_SET)

                fileName = key
                try:
                    # for Python > 3.3 some keys are bytes object some are str object
                    fileName = key.decode('utf-8')
                except:
                    pass

                # Make sure destination directory exists, ensuring we keep inside dirName
                destName = os.path.join(dirName, fileName.replace("..", "__"))
                destDirName = os.path.dirname(destName)
                if not os.path.exists(destDirName):
                    os.makedirs(destDirName)

                try:
                    data = f.read(length)
                    data = zlib.decompress(data)
                except:
                    print('[!] Error: Failed to decompress {0}, probably encrypted. Extracting as is.'.format(fileName))
                    open(destName + '.pyc.encrypted', 'wb').write(data)
                    continue

                with open(destName + '.pyc', 'wb') as pycFile:
                    pycFile.write(pycHeader)      # Write pyc magic
                    pycFile.write(b'\0' * 4)      # Write timestamp
                    if self.pyver >= 33:
                        pycFile.write(b'\0' * 4)  # Size parameter added in Python 3.3
                    pycFile.write(data)


def main():
    if len(sys.argv) < 2:
        print('[*] Usage: pyinstxtractor.py <filename>')

    else:
        arch = PyInstArchive(sys.argv[1])
        if arch.open():
            if arch.checkFile():
                if arch.getCArchiveInfo():
                    arch.parseTOC()
                    arch.extractFiles()
                    arch.close()
                    print('[*] Successfully extracted pyinstaller archive: {0}'.format(sys.argv[1]))
                    print('')
                    print('You can now use a python decompiler on the pyc files within the extracted directory')
                    return

            arch.close()


if __name__ == '__main__':
    main()

然后在exe所在路径cmd，执行下面这个格式的命令

Python 脚本名 要反编译的exe

例如我的脚本命名111.py，需要编译jiqiren.exe，如下图所示

第二步

执行上面的命令之后，结果如下图所示，并且当前路径出现一个文件夹【jiqiren.exe_extracted】
进入这个文件夹，找到jiqiren这个文件，定义文件类型为.pyc

第三步

安装uncompyle6库，命令行运行安装

pip install uncompyle6

然后在刚刚.pyc的路径cmd执行以下命令，把这个pyc反编译为jiqirenceshi1.py

uncompyle6 jiqiren.pyc>jiqirenceshi1.py

然后有的人可能，编译出来就不对了，如下图。那就要多一步了。

第四步

用UltraEdit32修改以下刚刚的pyc文件。打开之后是这样
 然后如下图步骤

走完上图步骤之后，第一行变成一堆20 20 20…..，把前面四个，改成42 0D 0D 0A，然后保存，再做一次文章的第三步，就上面那个uncompyle6那一步，就反编译好了，不过如果文件里面有中文，中文会变成问号。