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静态库破解方法——skinmagic

[ 来源:http://www.91now.com/down/ | 作者: | 时间:2007-5-18 17:43:13 | 浏览: 人次 ]


静态库可以直接硬链接到可执行文件中,虽然体积大了些,运行效率并不差,另外由于运行时不需要该静态库,用静态库编译生成的exe文件就看不出使用像skinmagic之类的库的痕迹了:) 。不过与动态库不同,静态库是COFF格式的,无法像可执行文件那样被直接反编译,给破解带来了一定的难度,本文提供了skinmagic静态库的破解过程,不失一般性,文中所用的方法可以用在其它静态库的破解中。
SkinMagic的静态库包括:
===============Visual C++ 6.0===============SkinMagicLibMT6Trial.lib       For Visual C++ 6.0 link with multithreaded run-time library.SkinMagicLibMD6Trial.lib       For Visual C++ 6.0 link with multithreaded DLL run-time library.
===============Visual C++ 7.0===============SkinMagicLibMT7Trial.lib       For Visual C++ 7.0 link with multithreaded run-time library.SkinMagicLibMD7Trial.lib       For Visual C++ 7.0 link with multithreaded DLL run-time library.
其中的MT代表multithreaded,而MD代表multithreaded DLL,需要在msdev的Project/Setting的C++/CodeGeneration标签下选择,如果你的工程要用MT类型的静态库,则debug版要选择"Debug Multithreaded",release版要选择"Multithreaded";如果要用MD类型的静态库,则debug版需要选择"Debug Multithreaded DLL",release版要选择"Multithreaded DLL"。
数字6代表for Visual C++ 6.0, 7代表for Visual C++ 7.0
我个人用msvc6,因此这里以SkinMagicLibMT6Trial.lib为例进行破解,其它静态库文件破法相同。
首先选择debug版,将静态库包含在stdAfx.h中:
#include "SkinMagicLib.h"#pragma comment(lib, "SkinMagicLibMT6Trial.lib")
然后按照skinmagic帮助在你的工程中添加代码,编译运行后弹出消息框提示未注册,点击确定后发现皮肤正常加载。这当然不是我们希望看到的,需要去掉这个讨厌的消息框。该消息框是由User32.dll中的函数MessageBox产生的(其实是个宏,真正会调用MessageBoxA或MessageBoxW拉)。MessageBoxA(或MessageBoxW,为了行文方便,不再提它了)在静态库SkinMagicLibMT6Trial.lib中属于导入(import)函数,因此首先想到的是将静态库IAT中的MessageBoxA symbol给搞掉。
方法一(失败):
用UtraEdit将静态库打开(HEX模式),alt+F3 查找ASCII字符串:"MessageBoxA",直到找到:
__imp__MessageBoxA@16">__imp__MessageBoxA@16 _C@_0N@FCOF@Unregistered?$AA">??_C@_0N@FCOF@Unregistered?$AA
__imp__XXX是一个Symbol(注意不是地址,这也是失败原因),能够定位到import library(User32.dll)中正确的IAT entry,当你自己写动态库时,定义函数:__declspec(dllimport) __stdcall void Fun(void);会产生类似效果。@16表示参数占16个字节,我们知道MessageBoxA有四个参数,函数原型:
WINUSERAPI int WINAPI MessageBoxA(    HWND hWnd ,    LPCSTR lpText,    LPCSTR lpCaption,    UINT uType);    其实就是:
__declspec(dllimport) int __stdcall MessageBoxA(    HWND hWnd ,    LPCSTR lpText,    LPCSTR lpCaption,    UINT uType);
我把UtraEdit定位的代码改成了其它函数(比如Sleep),列举如下:
__imp__Sleep@4">__imp__Sleep@4
注意其它未被覆盖的地方一律用0x00填充,保存后将修改后的静态库重新编译链接到工程,运行后OK了,不再弹那个NAG了,这么简单就搞定了!!!
没高兴太久就发现Debug版虽然OK了,可是Release版运行时会出错!这种野蛮的方式行不通。
方法二(成功):
需要用到msdev提供的两个命令行方式的工具:lib管理器和dumpbin, 要想在任何地方都可以运行最好确保以下批处理文件已经被执行过了:
"install path"\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT
要查看lib管理器的版本,在console中运行"lib"后,提示:Microsoft (R) Library Manager Version 6.00.8168
要查看dumpbin的版本,在console中运行"dumpbin"后,提示:Microsoft (R) COFF Binary File Dumper Version 6.00.8168
破解流程如下:我们需要用lib管理器定位并导出静态库中那个产生消息框的obj,然后用dumpbin分析该obj文件,用hex编辑器(这里用的是hiew)屏蔽掉该obj文件中调用MessageBox的代码,最后将修改后的obj再导入到静态库中,这就是整个破解过程。
步骤1 --导出obj,定位需要被破解的obj:
首先运行以下命令将静态库中的所有*.obj文件导出到一个文件中:lib /LIST SkinMagicLibMT6Trial.lib > liblist.txt
内容如下(总共124个obj文件,不一一列举了):
\WORKING\temp\vc6\Trial_Release\AnimateCtrlSkinData.obj\WORKING\temp\vc6\Trial_Release\AnimEffect.obj\WORKING\temp\vc6\Trial_Release\ApplicationSkinData.obj\WORKING\temp\vc6\Trial_Release\AreaSkinData.obj... ...
然后利用UltraEdit编辑liblist.txt,用Column菜单的Insert/Fill column功能做一个批处理文件dumpobj.bat,形如:
lib SkinMagicLibMT6Trial.lib /EXTRACT:\WORKING\temp\vc6\Trial_Release\AnimateCtrlSkinData.objlib SkinMagicLibMT6Trial.lib /EXTRACT:\WORKING\temp\vc6\Trial_Release\AnimEffect.objlib SkinMagicLibMT6Trial.lib /EXTRACT:\WORKING\temp\vc6\Trial_Release\ApplicationSkinData.objlib SkinMagicLibMT6Trial.lib /EXTRACT:\WORKING\temp\vc6\Trial_Release\AreaSkinData.obj... ...
运行该批处理文件会将静态库中的所有obj文件导出到当前目录下,此时再用UltraEdit将所有obj文件打开,选择"search / Find in Files",查找关键字"__imp__MessageBoxA",发现只有在SkinMagicLib.obj中找到了它,需要破解的obj文件找到了!就是SkinMagicLib.obj。
步骤2 --分析需要被破解的obj:
运行以下命令dump出SkinMagicLib.obj中尽可能详细的信息:dumpbin /ALL SkinMagicLib.obj > dumpcrackingobj.txt
在该文件中查找__imp__MessageBoxA,发现以下信息:
... ...
RELOCATIONS #38                                                Symbol    Symbol Offset    Type              Applied To         Index     Name --------  ----------------  -----------------  --------  ------ ... ...
00000149  DIR32             00000000           C6        __imp__MessageBoxA@16">__imp__MessageBoxA@16  ... ...   表示在RELOCATIONS #38的00000149处调用了MessageBoxA函数,向上滚屏,看一下 SECTION HEADER #38的信息:  SECTION HEADER #38   .text name       0 physical address       0 virtual address     291 size of raw data    3690 file pointer to raw data    3921 file pointer to relocation table       0 file pointer to line numbers      3A number of relocations       0 number of line numbers60101020 flags         Code         Communal; sym= "int __stdcall InitSkinMagicLib(struct HINSTANCE__ *,char const *,         char const *,char const *)" (__@@PBD11@Z">?InitSkinMagicLib@@YGHPAUHINSTANCE__@@PBD11@Z)         1 byte align         Execute Read
RAW DATA #38  00000000: B8 00 00 00 00 E8 00 00 00 00 83 EC 20 A1 0C 00  ............ ...  00000010: 00 00 53 33 DB 56 57 8B 3D 00 00 00 00 3B C3 BE  ..S3.VW.=....;..  00000020: 00 00 00 00 0F 85 2A 01 00 00 56 FF 15 00 00 00  ......*...V.....  00000030: 00 56 89 75 EC FF D7 8B 45 08 68 00 00 00 00 89  .V.u....E.h.....  00000040: 5D FC A3 00 00 00 00 FF 15 00 00 00 00 68 00 00  ]............h..  00000050: 00 00 50 FF 15 00 00 00 00 A3 00 00 00 00 E8 00  ..P.............  00000060: 00 00 00 85 C0 75 2C FF 15 00 00 00 00 89 45 E4  .....u,.......E.  00000070: 8D 45 E4 50 89 5D E8 8D 45 DC 50 B9 00 00 00 00  .E.P.]..E.P.....  00000080: E8 00 00 00 00 8B 00 C7 40 10 01 00 00 00 E9 8F  ........@.......  00000090: 00 00 00 E8 00 00 00 00 85 C0 75 15 FF 15 00 00  ..........u.....  000000A0: 00 00 89 45 E4 8D 45 E4 50 89 5D E8 8D 45 DC EB  ...E..E.P.]..E..  000000B0: C9 E8 00 00 00 00 8B C8 53 89 4D F0 E8 00 00 00  ........S.M.....  000000C0: 00 FF 75 08 8B 4D F0 E8 00 00 00 00 E8 00 00 00  ..u..M..........  000000D0: 00 3B C3 A3 00 00 00 00 7C 05 83 F8 03 7E 0A E8  .;......|....~..  000000E0: 00 00 00 00 A1 00 00 00 00 83 F8 07 75 42 FF 75  ............uB.u  000000F0: 08 E8 00 00 00 00 85 C0 59 75 35 FF 15 00 00 00  ........Yu5.....  00000100: 00 89 45 E4 8D 45 E4 50 8D 45 DC 50 B9 00 00 00  ..E..E.P.E.P....  00000110: 00 89 5D E8 E8 00 00 00 00 8B 00 C7 40 10 11 00  ..].........@...  00000120: 00 00 56 FF 15 00 00 00 00 33 C0 E9 50 01 00 00  ..V......3..P...  00000130: 6A 40 68 00 00 00 00 68 00 00 00 00 53 C7 05 00  j@h....h....S...  00000140: 00 00 00 01 00 00 00 FF 15 00 00 00 00 56 FF 15  .............V..  00000150: 00 00 00 00 56 89 75 E8 FF D7 8B 3D 00 00 00 00  ....V.u....=....  00000160: C7 45 FC 01 00 00 00 FF D7 89 45 08 8D 45 08 50  .E........E..E.P  00000170: 8D 45 F0 BB 00 00 00 00 50 8B CB E8 00 00 00 00  .E......P.......  00000180: 8B 45 F0 3B 05 04 00 00 00 75 3E FF 75 08 FF 35  .E.;.....u>.u..5  00000190: 00 00 00 00 68 00 00 00 00 6A 04 FF 15 00 00 00  ....h....j......  000001A0: 00 85 C0 89 45 EC 74 72 8B 45 08 83 65 E0 00 89  ....E.tr.E..e...  000001B0: 45 DC 8D 45 DC 50 8D 45 D4 50 8B CB E8 00 00 00  E..E.P.E.P......  000001C0: 00 8B 00 8B 4D EC 89 48 10 8D 45 08 BB 00 00 00  ....M..H..E.....  000001D0: 00 50 8D 45 EC 50 8B CB E8 00 00 00 00 8B 45 EC  .P.E.P........E.  000001E0: 3B 05 04 00 00 00 89 45 F0 75 73 FF 75 08 FF 35  ;......E.us.u..5  000001F0: 00 00 00 00 68 00 00 00 00 6A 02 FF 15 00 00 00  ....h....j......  00000200: 00 85 C0 89 45 EC 74 39 8D 45 08 8B CB 50 E8 00  ....E.t9.E...P..  00000210: 00 00 00 8B 4D EC 89 08 EB 44 FF D7 89 45 DC 8D  ....M....D...E..  00000220: 45 DC 50 8D 45 D4 33 FF 50 B9 00 00 00 00 89 7D  E.P.E.3.P......}  00000230: E0 E8 00 00 00 00 8B 00 C7 40 10 02 00

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