【破文标题】The Lighthouse Screensaver 1.0 算法分析及算法注册机
【破文作者】zaas[PYG]
【破解工具】OllyICE，PEiD v0.94
【破解平台】WinXP
【软件类别】：屏幕保护
【软件授权】：共享版
【软件介绍】：一个比较酷的夜景灯塔屏保
【破解声明】我是一只小菜鸟，偶得一点心得，愿与大家分享
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【破解内容】
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查壳无壳：Microsoft Visual C++ 6.0 [Overlay]
注册失败无提示，注册成功有提示：
Ultra String Reference, 条目 391 Address=00415F1D
Disassembly=push 0044EF30
Text String=registered ok , please restart the program!
来到
00415DDF . E8 8CCD0100 call 00432B70 ; 取假码
00415DE4 . 8B46 68 mov eax, dword ptr [esi+68]
00415DE7 . 8D7E 68 lea edi, dword ptr [esi+68]
00415DEA . 8378 F8 13 cmp dword ptr [eax-8], 13 ; 注册码0x13位
00415DEE . 0F85 51010000 jnz 00415F45
00415DF4 . 51 push ecx
00415DF5 . 8BCC mov ecx, esp
00415DF7 . 896424 18 mov dword ptr [esp+18], esp
00415DFB . 68 5CEF4400 push 0044EF5C ; regseed没有意义，大概是和其他软件共用的#define
00415E00 . E8 9EE10100 call 00433FA3 ; 得出固定字符串"peterpan@2977"
00415E05 . 8D4C24 14 lea ecx, dword ptr [esp+14]
...........
00415E36 . 52 push edx
00415E37 . C64424 34 01 mov byte ptr [esp+34], 1
00415E3C . E8 69DE0100 call 00433CAA
00415E41 . 885C24 30 mov byte ptr [esp+30], bl
00415E45 . E8 361BFFFF call 00407980 ; 关键call
00415E4A . 83C4 08 add esp, 8
00415E4D . 3BC3 cmp eax, ebx
00415E4F . 0F84 DF000000 je 00415F34 ; 关键跳
00415E55 . 51 push ecx
00415E56 . 8BCC mov ecx, esp
00415E58 . 896424 18 mov dword ptr [esp+18], esp
00415E5C . 68 50EA4400 push 0044EA50 ; cfyscreensaverbuilder24
00415E61 . E8 3DE10100 call 00433FA3
00415E66 . 8B46 60 mov eax, dword ptr [esi+60]
00415E69 . 51 push ecx
00415E6A . 83C0 5C add eax, 5C
00415E6D . 8BCC mov ecx, esp
00415E6F . 896424 20 mov dword ptr [esp+20], esp
00415E73 . 50 push eax
00415E74 . C64424 34 02 mov byte ptr [esp+34], 2
00415E79 . E8 2CDE0100 call 00433CAA
00415E7E . 8D4C24 14 lea ecx, dword ptr [esp+14]
00415E82 . 885C24 30 mov byte ptr [esp+30], bl
00415E86 . 51 push ecx
00415E87 . E8 1417FFFF call 004075A0 ; 二次加密运算出写注册表的内容
00415E8C . 83C4 08 add esp, 8
00415E8F . 8D5424 10 lea edx, dword ptr [esp+10]
00415E93 . 8BCC mov ecx, esp
00415E95 . 896424 1C mov dword ptr [esp+1C], esp
00415E99 . 52 push edx
00415E9A . C64424 30 03 mov byte ptr [esp+30], 3
00415E9F . E8 06DE0100 call 00433CAA
00415EA4 . 8B46 60 mov eax, dword ptr [esi+60]
00415EA7 . 51 push ecx
00415EA8 . 83C0 5C add eax, 5C
00415EAB . 8BCC mov ecx, esp
00415EAD . 896424 1C mov dword ptr [esp+1C], esp
00415EB1 . 50 push eax
00415EB2 . C64424 34 04 mov byte ptr [esp+34], 4
00415EB7 . E8 EEDD0100 call 00433CAA ; 变形出4组，写入注册表
00415EBC . 51 push ecx
00415EBD . 8D5424 18 lea edx, dword ptr [esp+18]
00415EC1 . 8BCC mov ecx, esp
00415EC3 . 896424 28 mov dword ptr [esp+28], esp
00415EC7 . 52 push edx
00415EC8 . 68 34EA4400 push 0044EA34 ; software\microsoft\windows\
00415ECD . 51 push ecx
...........
00415F08 > 33C0 xor eax, eax
00415F0A > 8B40 1C mov eax, dword ptr [eax+1C]
00415F0D . 53 push ebx ; /lParam
00415F0E . 53 push ebx ; |wParam
00415F0F . 68 CE070000 push 7CE ; |Message = MSG(7CE)
00415F14 . 50 push eax ; |hWnd
00415F15 . FF15 20054400 call dword ptr [<&USER32.PostMessageA>; \PostMessageA
00415F1B . 53 push ebx
00415F1C . 53 push ebx
00415F1D . 68 30EF4400 push 0044EF30 ; registered ok , please restart the program!
00415F22 . E8 4D1B0200 call 00437A74 ; (initial cpu selection)
00407A1B |. E8 01700200 call 0042EA21 ; 假码字符串前边加了a
00407A20 |. 8B4424 04 mov eax, dword ptr [esp+4]
00407A24 |. 8A48 01 mov cl, byte ptr [eax+1]
00407A27 |. 884C24 1C mov byte ptr [esp+1C], cl
00407A2B |. 8A48 02 mov cl, byte ptr [eax+2]
00407A2E |. 884C24 2C mov byte ptr [esp+2C], cl
00407A32 |. 8A48 03 mov cl, byte ptr [eax+3]
00407A35 |. 884C24 2D mov byte ptr [esp+2D], cl
00407A39 |. 8A48 04 mov cl, byte ptr [eax+4]
00407A3C |. 884C24 1D mov byte ptr [esp+1D], cl
00407A40 |. 8A48 05 mov cl, byte ptr [eax+5]
00407A43 |. 884C24 2E mov byte ptr [esp+2E], cl
00407A47 |. 8A48 06 mov cl, byte ptr [eax+6]
00407A4A |. 884C24 2F mov byte ptr [esp+2F], cl
00407A4E |. 8A48 07 mov cl, byte ptr [eax+7]
00407A51 |. 884C24 1E mov byte ptr [esp+1E], cl
00407A55 |. 8A48 08 mov cl, byte ptr [eax+8]
00407A58 |. 884C24 1F mov byte ptr [esp+1F], cl
00407A5C |. 8A48 09 mov cl, byte ptr [eax+9]
00407A5F |. 884C24 23 mov byte ptr [esp+23], cl
00407A63 |. 8A48 0A mov cl, byte ptr [eax+A]
00407A66 |. 884C24 20 mov byte ptr [esp+20], cl
00407A6A |. 8A48 0B mov cl, byte ptr [eax+B]
00407A6D |. 884C24 29 mov byte ptr [esp+29], cl
00407A71 |. 8A48 0C mov cl, byte ptr [eax+C]
00407A74 |. 884C24 21 mov byte ptr [esp+21], cl
00407A78 |. 8A48 0D mov cl, byte ptr [eax+D]
00407A7B |. 884C24 2B mov byte ptr [esp+2B], cl
00407A7F |. 8A48 0E mov cl, byte ptr [eax+E]
00407A82 |. 884C24 2A mov byte ptr [esp+2A], cl
00407A86 |. 8A48 0F mov cl, byte ptr [eax+F]
00407A89 |. 884C24 22 mov byte ptr [esp+22], cl
00407A8D |. 8A40 10 mov al, byte ptr [eax+10]
00407A90 |. 884424 28 mov byte ptr [esp+28], al ; 以上对假码其中的16位分2组
00407A94 |. 8D4424 1C lea eax, dword ptr [esp+1C] ; 一组用于运算
00407A98 |. 50 push eax ; 一组用于校验
00407A99 |. 8D4C24 0C lea ecx, dword ptr [esp+C]
00407A9D |. 885C24 28 mov byte ptr [esp+28], bl
...........
00407AB9 |. 8D5424 48 lea edx, dword ptr [esp+48]
00407ABD |. 8BCC mov ecx, esp
00407ABF |. 896424 18 mov dword ptr [esp+18], esp
00407AC3 |. 52 push edx
00407AC4 |. E8 E1C10200 call 00433CAA ; 固定字符串"peterpan@2977"
00407AC9 |. 51 push ecx
00407ACA |. 8D4424 10 lea eax, dword ptr [esp+10]
...........
00407ADF |. 8D4C24 18 lea ecx, dword ptr [esp+18]
00407AE3 |. C64424 44 04 mov byte ptr [esp+44], 4
00407AE8 |. 51 push ecx
00407AE9 |. E8 B2FAFFFF call 004075A0 ; 扩展出一组，算法call
00407AEE |. 83C4 0C add esp, 0C
00407AF1 |. 50 push eax
...........
00407B0E |. 8B5424 0C mov edx, dword ptr [esp+C] ; 校验组
00407B12 |. 8B4424 08 mov eax, dword ptr [esp+8] ; 运算组的结果
00407B16 |. 52 push edx
00407B17 |. 50 push eax
00407B18 |. E8 E5920100 call 00420E02 ; 比较call
00407B1D |. 83C4 08 add esp, 8
00407B20 |. 85C0 test eax, eax
00407B22 |. C64424 3C 03 mov byte ptr [esp+3C], 3
00407B27 |. 8D4C24 0C lea ecx, dword ptr [esp+C]
00407B2B 75 54 jnz short 00407B81 ; 关键跳
00407742 |> /8D5424 34 /lea edx, dword ptr [esp+34]
00407746 |. |8D4C24 10 |lea ecx, dword ptr [esp+10]
0040774A |. |52 |push edx
0040774B |. |E8 FDCB0200 |call 0043434D ; peterpan@2977+peterpan@2977
00407750 |. |8B4424 10 |mov eax, dword ptr [esp+10]
00407754 |. |3970 F8 |cmp dword ptr [eax-8], esi ; 26位
00407757 |.^\7C E9 \jl short 00407742
00407759 |> 56 push esi
0040775A |. 8D4C24 18 lea ecx, dword ptr [esp+18]
0040775E |. 6A 00 push 0
00407760 |. 51 push ecx
00407761 |. 8D4C24 1C lea ecx, dword ptr [esp+1C]
00407765 |. E8 F2740200 call 0042EC5C ; 截取前20位
0040776A |. 50 push eax
0040776B |. 8D4C24 38 lea ecx, dword ptr [esp+38]
0040776F |. C64424 2C 05 mov byte ptr [esp+2C], 5
00407774 |. E8 F5C80200 call 0043406E
00407779 |. 8D4C24 14 lea ecx, dword ptr [esp+14]
0040777D |. C64424 28 03 mov byte ptr [esp+28], 3
00407782 |. E8 AEC70200 call 00433F35
00407787 |. 8B5424 38 mov edx, dword ptr [esp+38] ; 假码第一组
0040778B |. 8D4424 38 lea eax, dword ptr [esp+38]
0040778F |. 50 push eax
00407790 |. 8D4C24 14 lea ecx, dword ptr [esp+14]
00407794 |. 8B7A F8 mov edi, dword ptr [edx-8]
00407797 |. E8 D2C80200 call 0043406E
0040779C |. 3BFE cmp edi, esi
0040779E |. 7D 3B jge short 004077DB
004077A0 |. B3 06 mov bl, 6
004077A2 |> 8D4C24 38 /lea ecx, dword ptr [esp+38]
004077A6 |. 8D5424 10 |lea edx, dword ptr [esp+10]
004077AA |. 51 |push ecx
004077AB |. 8D4424 18 |lea eax, dword ptr [esp+18]
004077AF |. 52 |push edx
004077B0 |. 50 |push eax
004077B1 |. E8 AEC90200 |call 00434164
004077B6 |. 50 |push eax
004077B7 |. 8D4C24 14 |lea ecx, dword ptr [esp+14]
004077BB |. 885C24 2C |mov byte ptr [esp+2C], bl
004077BF |. E8 AAC80200 |call 0043406E
004077C4 |. 8D4C24 14 |lea ecx, dword ptr [esp+14]
004077C8 |. C64424 28 03 |mov byte ptr [esp+28], 3
004077CD |. E8 63C70200 |call 00433F35
004077D2 |. 8B4C24 10 |mov ecx, dword ptr [esp+10]
004077D6 |. 3971 F8 |cmp dword ptr [ecx-8], esi
004077D9 |.^ 7C C7 \jl short 004077A2 ; 扩展长度
004077DB |> 56 push esi
004077DC |. 8D5424 18 lea edx, dword ptr [esp+18]
004077E0 |. 6A 00 push 0
004077E2 |. 52 push edx
004077E3 |. 8D4C24 1C lea ecx, dword ptr [esp+1C]
004077E7 |. E8 70740200 call 0042EC5C ; 截取前20位
004077EC |. 50 push eax
004077ED |. 8D4C24 3C lea ecx, dword ptr [esp+3C]
004077F1 |. C64424 2C 07 mov byte ptr [esp+2C], 7
004077F6 |. E8 73C80200 call 0043406E
004077FB |. 8D4C24 14 lea ecx, dword ptr [esp+14]
004077FF |. C64424 28 03 mov byte ptr [esp+28], 3
00407804 |. E8 2CC70200 call 00433F35
00407809 |. 33FF xor edi, edi
0040780B |. 85F6 test esi, esi
0040780D |. 7E 20 jle short 0040782F
0040780F |> 8B4424 34 /mov eax, dword ptr [esp+34] ; 扩展后的假码第一组
00407813 |. 8B5424 38 |mov edx, dword ptr [esp+38] ; 扩展后的固定字符串
00407817 |. 8A0C07 |mov cl, byte ptr [edi+eax]
0040781A |. 8A0417 |mov al, byte ptr [edi+edx]
0040781D |. 32C1 |xor al, cl ; 不过是xor
0040781F |. 8D4C24 34 |lea ecx, dword ptr [esp+34]
00407823 |. 50 |push eax
00407824 |. 57 |push edi
00407825 |. E8 31CC0200 |call 0043445B ; 写回字符串
0040782A |. 47 |inc edi
0040782B |. 3BFE |cmp edi, esi
0040782D |.^ 7C E0 \jl short 0040780F
0040782F |> 8B5424 34 mov edx, dword ptr [esp+34]
00407833 |. 33F6 xor esi, esi
00407835 |> 32C9 /xor cl, cl ; 每个大循环的初始值为0
00407837 |. 33C0 |xor eax, eax
00407839 |. 85ED |test ebp, ebp
0040783B |. 7E 0A |jle short 00407847
0040783D |> 8A1C02 |/mov bl, byte ptr [edx+eax] ; 变形后的字符串取字符
00407840 |. 02CB ||add cl, bl ; byte类型相加
00407842 |. 40 ||inc eax
00407843 |. 3BC5 ||cmp eax, ebp ; 4个一组作为数值
00407845 |.^ 7C F6 |\jl short 0040783D
00407847 |> 884C34 14 |mov byte ptr [esp+esi+14], cl
0040784B |. 46 |inc esi
0040784C |. 03D5 |add edx, ebp
0040784E |. 83FE 05 |cmp esi, 5 ; 5次
00407851 |.^ 7C E2 \jl short 00407835 ; 这里是一个嵌套的For 循环
00407853 |. 68 701B4500 push 00451B70
00407858 |. 8D4C24 14 lea ecx, dword ptr [esp+14]
0040785C |. E8 5DC80200 call 004340BE
00407861 |. 8B7424 18 mov esi, dword ptr [esp+18] ; 得出2组数值，这是第二组
00407865 |. 8B5C24 14 mov ebx, dword ptr [esp+14] ; 得出2组数值，这是第一组
00407869 |. BF 08000000 mov edi, 8
0040786E |> 8AC3 /mov al, bl ; 转化字符串的过程 select case
00407870 |. 24 1F |and al, 1F ; and 1F --》0B11111
00407872 |. 884424 14 |mov byte ptr [esp+14], al
00407876 |. 7C 08 |jl short 00407880 ; 小于0
00407878 |. 3C 03 |cmp al, 3
0040787A |. 7F 04 |jg short 00407880
0040787C |. 04 49 |add al, 49 ; 《=3，+49
0040787E |. EB 76 |jmp short 004078F6
00407880 |> 3C 04 |cmp al, 4
00407882 |. 7C 0E |jl short 00407892
00407884 |. 3C 07 |cmp al, 7
00407886 |. 7F 0A |jg short 00407892
00407888 |. B1 57 |mov cl, 57
0040788A |. 2AC8 |sub cl, al ; 4-7是 57-
0040788C |. 884C24 14 |mov byte ptr [esp+14], cl
00407890 |. EB 68 |jmp short 004078FA
00407892 |> 3C 08 |cmp al, 8
00407894 |. 7C 08 |jl short 0040789E
00407896 |. 3C 0B |cmp al, 0B
00407898 |. 7F 04 |jg short 0040789E
0040789A |. 04 39 |add al, 39 ; 8-11 ，+39
0040789C |. EB 58 |jmp short 004078F6
0040789E |> 3C 0C |cmp al, 0C
004078A0 |. 7C 0E |jl short 004078B0
004078A2 |. 3C 0F |cmp al, 0F
004078A4 |. 7F 0A |jg short 004078B0
004078A6 |. B2 41 |mov dl, 41
004078A8 |. 2AD0 |sub dl, al
004078AA |. 885424 14 |mov byte ptr [esp+14], dl
004078AE |. EB 4A |jmp short 004078FA
004078B0 |> 3C 10 |cmp al, 10
004078B2 |. 7C 08 |jl short 004078BC
004078B4 |. 3C 13 |cmp al, 13
004078B6 |. 7F 04 |jg short 004078BC
004078B8 |. 04 35 |add al, 35 ; 10,11,12,13 时+35
004078BA |. EB 3A |jmp short 004078F6
004078BC |> 3C 14 |cmp al, 14
004078BE |. 7C 0E |jl short 004078CE
004078C0 |. 3C 17 |cmp al, 17
004078C2 |. 7F 0A |jg short 004078CE
004078C4 |. B1 6B |mov cl, 6B
004078C6 |. 2AC8 |sub cl, al
004078C8 |. 884C24 14 |mov byte ptr [esp+14], cl
004078CC |. EB 2C |jmp short 004078FA
004078CE |> 3C 18 |cmp al, 18
004078D0 |. 7C 08 |jl short 004078DA
004078D2 |. 3C 1B |cmp al, 1B
004078D4 |. 7F 04 |jg short 004078DA
004078D6 |. 04 1E |add al, 1E
004078D8 |. EB 1C |jmp short 004078F6
004078DA |> 3C 1C |cmp al, 1C
004078DC |. 7C 0E |jl short 004078EC
004078DE |. 3C 1D |cmp al, 1D
004078E0 |. 7F 0A |jg short 004078EC
004078E2 |. B2 75 |mov dl, 75
004078E4 |. 2AD0 |sub dl, al
004078E6 |. 885424 14 |mov byte ptr [esp+14], dl
004078EA |. EB 0E |jmp short 004078FA
004078EC |> 3C 1E |cmp al, 1E
004078EE |. 7C 0A |jl short 004078FA
004078F0 |. 3C 1F |cmp al, 1F
004078F2 |. 7F 06 |jg short 004078FA
004078F4 |. 04 2F |add al, 2F
004078F6 |> 884424 14 |mov byte ptr [esp+14], al ; 计算结果放回去
004078FA |> 8B4424 14 |mov eax, dword ptr [esp+14]
004078FE |. 8D4C24 10 |lea ecx, dword ptr [esp+10]
00407902 |. 50 |push eax
00407903 |. E8 30CA0200 |call 00434338 ; 转回字符串
00407908 |. B9 05000000 |mov ecx, 5
0040790D |. 8BC3 |mov eax, ebx ; 两组数据shrd
0040790F |. 8BD6 |mov edx, esi
00407911 |. E8 BA9A0100 |call 004213D0
00407916 |. 4F |dec edi
00407917 |. 8BD8 |mov ebx, eax
00407919 |. 8BF2 |mov esi, edx
0040791B |.^ 0F85 4DFFFFFF \jnz 0040786E
00407921 |. 8B7424 30 mov esi, dword ptr [esp+30]
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谢谢提供好文
