如何反編譯微信小程序

查找wxapkg文件

wxapkg無論是debug版還是release版，是小程序還是小遊戲，都在這個目錄下,一串星號是小程序的hash。

/data/data/com.tencent.mm/MicroMsg/***********/appbrand/pkg

debug版文件後綴並不是.wxapkg，但是打開文件可見第一個字節爲0xBE

反編譯

運行如下python腳本，就會解包。

# -*- coding: utf-8 -*-
# @Author: saidyou
# @Date:   2020-03-24 12:55:49
# @Last Modified by:   saidyou
# @Last Modified time: 2020-03-24 14:54:06
import os
import sys      
    
class wxapkg:
    wxapkg_path = ""
    out_path = ""

    def __init__(self,wxapkg_path):
        self.wxapkg_path =wxapkg_path
        if wxapkg_path.endswith('.wxapkg'):
            self.out_path =wxapkg_path[:wxapkg_path.rfind('.wxapkg')]
        else:
            self.out_path = wxapkg_path+'_decode'
    
    def open_wxapkg(self):
        fd = open(self.wxapkg_path,"rb")
        if self.is_wxapkg() == False:
            fd.close()
            return
        #header
        self.get_header(fd)
        #get file name
        file_num = self.get_file_num(fd)
        #file resource
        for i in range(0,file_num):
            self.get_file(fd)
        
        
    def close_wxapkg(self):
        self.close()
        
    def is_wxapkg(self):
        fd = open(self.wxapkg_path,"rb")
        key = fd.read(1)
        if ord(key)==0xbe:
            # print(" right format")
            return True
        else:
            print("not wxapkg format")
            return False
        
    def bytesToInt(self ,byte_array):
        num = (byte_array[0]<<24) + (byte_array[1]<<16) + (byte_array[2]<<8) + byte_array[3]
        return num

    def get_int(self,fd,length):
        num = 0
        for i in range(0,length):
            num = (num<<8) + (ord(fd.read(1)))
        return num

    def create_path(self,path):
        if path.find(os.sep):
            dir_path = path[:path.rfind(os.sep)]
            if not os.path.exists(dir_path):
                os.makedirs(dir_path)


    #read wxapkg
    def get_header(self,fd):
        header = fd.read(0x10)

    def get_file_num(self,fd):
        file_num = self.get_int(fd,2)
        return file_num


    #read file
    def get_file(self,fd):
        file_name_length = self.get_int(fd,4)
        file_name = fd.read(file_name_length).decode().replace('/',os.sep,)
        file_path = self.out_path+file_name
        file_start =self.get_int(fd,4)
        file_length = self.get_int(fd,4)
        tmp_seek = fd.tell()
        fd.seek(file_start, os.SEEK_SET)
        file_content = fd.read(file_length)
        print("[start] %4x [length] %4x [file_name] %s"%(file_start,file_length,file_name))
        self.create_path(file_path)
        open(file_path,"wb").write(file_content)
        fd.seek(tmp_seek, os.SEEK_SET)

        
if __name__ == '__main__':
    if len(sys.argv)<2:
        print("Please input wxapkg file path")
        exit(0) 
    apk = wxapkg(sys.argv[1])
    apk.open_wxapkg()