有声有色 3.10

标题：how to write patch for 有声有色 3.10.txt (4千字)
作者：dREAMtHEATER
时间：2000-8-20 20:24:26
链接：http://bbs.pediy.com

今天我cracking了有声有色 3.10，下载地点http://www.newhua.com.cn/down/you310.zip, 它是用aspack 2.1加的壳，我已成功地将它unpack, crack down, 但我想现在想写一个patch, 一个直接在它的原文件MusRea.exe上写上patch代码，即在.Aspack section最后的无代码部分加上我的patch代码，但似乎不成功，望高手能赐教：

分析过程如下：

在.Aspack section一节, 最后要返回原程序entry point前的反汇编代码如下：

:004CC4F3 61 popad
:004CC4F4 7508 jne 004CC4FE

* Possible Reference to String Resource ID=00001: "櫃橠DDD櫃櫃DDA櫃櫃橠D櫃櫃橠D櫃櫃橠D櫃櫃煓D櫉櫃�檻D?鶛�?
|
:004CC4F6 B801000000 mov eax, 00000001
:004CC4FB C20C00 ret 000C

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004CC4F4(C)
|
:004CC4FE 6800000000 push 00000000 <==将此处改为E99D1F0000
:004CC503 C3 ret <==从此返回原程序entry point

我的思路将:004CC4FE处代码改为 jmp 004ce434, :004ce434为.Aspack section一节无代码处，在此处我写入我的patch代码，即:
mov dword ptr [0048A4E1], 90E98002
push 00000000
ret

HEX值：C705E1A448000280E9906800000000C3,
这种思路我在老外的tutor里看到过，但我的测试未通过，请高人指点。

附：我写的关于如何破解有声有色 3.10的tutor

Target file : MusRea.exe
Packer: Aspack 2.1
Compiler: Delphi 5.0

cracking tutorial:

1.unpacking target file with your favorite tools , eg. softice or trw, I prefer to use UnAspack 1.0.9.1
2.Using ProcDump change the Section Characteristics for the CODE section to 0xE0000020. (you must master PE file format, or you don't understand it. :-()
3.Disassemble the target file
4.anlysis the source code:
:0048A4D4 8B8318050000 mov eax, dword ptr [ebx+00000518]
:0048A4DA 83B8380100001E cmp dword ptr [eax+00000138], 0000001E <== see if you have used 30 times
:0048A4E1 0F8498000000 je 0048A57F
:0048A4E7 8B831C050000 mov eax, dword ptr [ebx+0000051C]
:0048A4ED 8B10 mov edx, dword ptr [eax]
:0048A4EF FF92B4000000 call dword ptr [edx+000000B4]
:0048A4F5 3C01 cmp al, 01
:0048A4F7 0F8482000000 je 0048A57F
:0048A4FD 8B8324050000 mov eax, dword ptr [ebx+00000524]
:0048A503 8B10 mov edx, dword ptr [eax]
:0048A505 FF92B4000000 call dword ptr [edx+000000B4]
:0048A50B 3C01 cmp al, 01
:0048A50D 7470 je 0048A57F
:0048A50F 8B8328050000 mov eax, dword ptr [ebx+00000528]
:0048A515 8B10 mov edx, dword ptr [eax]
:0048A517 FF92B4000000 call dword ptr [edx+000000B4]
:0048A51D 3C01 cmp al, 01
:0048A51F 745E je 0048A57F
:0048A521 8B832C050000 mov eax, dword ptr [ebx+0000052C]
:0048A527 8B10 mov edx, dword ptr [eax]
:0048A529 FF92B4000000 call dword ptr [edx+000000B4]
:0048A52F 3C01 cmp al, 01
:0048A531 744C je 0048A57F
:0048A533 8B8330050000 mov eax, dword ptr [ebx+00000530]
:0048A539 8B10 mov edx, dword ptr [eax]
:0048A53B FF92B4000000 call dword ptr [edx+000000B4]
:0048A541 3C01 cmp al, 01
:0048A543 743A je 0048A57F
:0048A545 8B8330050000 mov eax, dword ptr [ebx+00000530]
:0048A54B 8B10 mov edx, dword ptr [eax]
:0048A54D FF92B4000000 call dword ptr [edx+000000B4]
:0048A553 3C01 cmp al, 01
:0048A555 7428 je 0048A57F
:0048A557 8B8334050000 mov eax, dword ptr [ebx+00000534]
:0048A55D 8B10 mov edx, dword ptr [eax]
:0048A55F FF92B4000000 call dword ptr [edx+000000B4]
:0048A565 3C01 cmp al, 01
:0048A567 7416 je 0048A57F
:0048A569 8B833C050000 mov eax, dword ptr [ebx+0000053C]
:0048A56F 8B10 mov edx, dword ptr [eax]
:0048A571 FF92B4000000 call dword ptr [edx+000000B4]
:0048A577 3C01 cmp al, 01
:0048A579 0F85E2010000 jne 0048A761 <==if everything OK, you should jump to 0048A761 from it.

Through the analysis, you can change the code at :0048A4DA to jmp 0048A761, I think you know how to modify HEX value, do it yourself. Do you understand? let me know.
5.run the target file again, see what happen? Bingo! The limit use 30 times is removed.

DO NOT USE THIS TUTOR FOR COMMERICAL PURPOSE, IF YOU LIKE THIS PROGRAM, PLEASE PAY THE AUTHOR'S HARD WORK, THE REGISTER FEE IS ONLY TEN YUAN.