屏幕录像专家20041209版的破解思路

主程序没有加壳

用 OD 载入，停在了软件的入口
00437D20 /. 55 push ebp
00437D21 |. 8BEC mov ebp,esp
00437D23 |. 81C4 CCFEFFFF add esp,-134
00437D29 |. 53 push ebx
00437D2A |. 8995 44FFFFFF mov dword ptr ss:[ebp-BC],edx
00437D30 |. 8985 48FFFFFF mov dword ptr ss:[ebp-B8],eax
00437D36 |. B8 FCBA5000 mov eax,屏录专家.0050BAFC
00437D3B |. E8 60440A00 call <屏录专家.@__InitExceptBlockLDTC>
00437D40 |. 66:C785 5CFFFFFF 0800 mov word ptr ss:[ebp-A4],8
00437D49 |. 8D45 FC lea eax,dword ptr ss:[ebp-4]
00437D4C |. E8 BF9BFCFF call <屏录专家.unknown_libname_37>
00437D51 |. 8BD0 mov edx,eax
00437D53 |. FF85 68FFFFFF inc dword ptr ss:[ebp-98]
00437D59 |. 8B8D 48FFFFFF mov ecx,dword ptr ss:[ebp-B8]
00437D5F |. 8B81 E4020000 mov eax,dword ptr ds:[ecx+2E4]
00437D65 |. E8 1E860500 call <屏录专家.@TControl@GetText$qqrv> ;取注册码
00437D6A |. 8D55 FC lea edx,dword ptr ss:[ebp-4] ；**edx->注册码

00437D6D |. FF32 push dword ptr ds:[edx]
00437D6F |. 8D45 F8 lea eax,dword ptr ss:[ebp-8]
00437D72 |. E8 999BFCFF call <屏录专家.unknown_libname_37>
00437D77 |. 8BD0 mov edx,eax
00437D79 |. FF85 68FFFFFF inc dword ptr ss:[ebp-98]
00437D7F |. 8B8D 48FFFFFF mov ecx,dword ptr ss:[ebp-B8]
00437D85 |. 8B81 DC020000 mov eax,dword ptr ds:[ecx+2DC]
00437D8B |. E8 F8850500 call <屏录专家.@TControl@GetText$qqrv> ;取注册名
00437D90 |. 8D55 F8 lea edx,dword ptr ss:[ebp-8] ;**edx->注册名

00437D93 |. FF32 push dword ptr ds:[edx]
00437D95 |. FFB5 48FFFFFF push dword ptr ss:[ebp-B8]
00437D9B |. E8 180C0000 call <屏录专家.old_ver> ;关于老版本
00437DA0 |. 83C4 0C add esp,0C
00437DA3 |. 3C 01 cmp al,1
00437DA5 |. 0F94C1 sete cl
00437DA8 |. 83E1 01 and ecx,1
00437DAB |. 51 push ecx
00437DAC |. FF8D 68FFFFFF dec dword ptr ss:[ebp-98]
00437DB2 |. 8D45 F8 lea eax,dword ptr ss:[ebp-8]
00437DB5 |. BA 02000000 mov edx,2
00437DBA |. E8 11F70A00 call <屏录专家.@System@AnsiString@$bdtr$qqrv>
00437DBF |. FF8D 68FFFFFF dec dword ptr ss:[ebp-98]
00437DC5 |. 8D45 FC lea eax,dword ptr ss:[ebp-4]
00437DC8 |. BA 02000000 mov edx,2
00437DCD |. E8 FEF60A00 call <屏录专家.@System@AnsiString@$bdtr$qqrv>
00437DD2 |. 59 pop ecx
00437DD3 |. 84C9 test cl,cl
00437DD5 |. 74 48 je short 屏录专家.00437E1F ；不是老版本

00437DD7 |. 66:C785 5CFFFFFF 1400 mov word ptr ss:[ebp-A4],14 ；注册码是老版本
00437DE0 |. BA DCB75000 mov edx,屏录专家.0050B7DC
00437DE5 |. 8D45 F4 lea eax,dword ptr ss:[ebp-C]
00437DE8 |. E8 ABF40A00 call <屏录专家.sub_4E7298>
00437DED |. FF85 68FFFFFF inc dword ptr ss:[ebp-98]
00437DF3 |. 8B00 mov eax,dword ptr ds:[eax]
00437DF5 |. E8 46310500 call <屏录专家.@Dialogs@ShowMessage$qqrx17System@AnsiString>
00437DFA |. FF8D 68FFFFFF dec dword ptr ss:[ebp-98]
00437E00 |. 8D45 F4 lea eax,dword ptr ss:[ebp-C]
00437E03 |. BA 02000000 mov edx,2
00437E08 |. E8 C3F60A00 call <屏录专家.@System@AnsiString@$bdtr$qqrv>
00437E0D |. 8B8D 4CFFFFFF mov ecx,dword ptr ss:[ebp-B4]
00437E13 |. 64:890D 00000000 mov dword ptr fs:[0],ecx
00437E1A |. E9 7E0B0000 jmp 屏录专家.0043899D ；返回

不是老版本：
00437E1F |> 6A 14 push 14
00437E21 |. 6A 00 push 0
00437E23 |. 8D85 00FFFFFF lea eax,dword ptr ss:[ebp-100]
00437E29 |. 50 push eax
00437E2A |. E8 A13F0A00 call <屏录专家._memset>
00437E2F |. 83C4 0C add esp,0C
00437E32 |. 33D2 xor edx,edx
00437E34 |. 8995 40FFFFFF mov dword ptr ss:[ebp-C0],edx
00437E3A |. 6A 14 push 14
00437E3C |. 6A 00 push 0
00437E3E |. 8D8D 18FFFFFF lea ecx,dword ptr ss:[ebp-E8]
00437E44 |. 51 push ecx
00437E45 |. E8 863F0A00 call <屏录专家._memset>
00437E4A |. 83C4 0C add esp,0C
00437E4D |. 6A 14 push 14
00437E4F |. 6A 00 push 0
00437E51 |. 8D85 E8FEFFFF lea eax,dword ptr ss:[ebp-118]
00437E57 |. 50 push eax
00437E58 |. E8 733F0A00 call <屏录专家._memset>
00437E5D |. 83C4 0C add esp,0C
00437E60 |. 66:C785 5CFFFFFF 2000 mov word ptr ss:[ebp-A4],20
00437E69 |. 8D45 F0 lea eax,dword ptr ss:[ebp-10]
00437E6C |. E8 9F9AFCFF call <屏录专家.unknown_libname_37>
00437E71 |. 8BD0 mov edx,eax
00437E73 |. FF85 68FFFFFF inc dword ptr ss:[ebp-98]
00437E79 |. 8B8D 48FFFFFF mov ecx,dword ptr ss:[ebp-B8]
00437E7F |. 8B81 DC020000 mov eax,dword ptr ds:[ecx+2DC]
00437E85 |. E8 FE840500 call <屏录专家.@TControl@GetText$qqrv> ；取注册名
00437E8A |. 8D45 F0 lea eax,dword ptr ss:[ebp-10]
**eax->取注册名
00437E8D |. E8 46DEFCFF call <屏录专家.@System@AnsiString@c_str$xqqrv>
00437E92 |. 50 push eax
00437E93 |. 8D95 E8FEFFFF lea edx,dword ptr ss:[ebp-118]
00437E99 |. 52 push edx
00437E9A |. E8 5D400A00 call <屏录专家._strcpy> ;copy 注册名
00437E9F |. 83C4 08 add esp,8
00437EA2 |. FF8D 68FFFFFF dec dword ptr ss:[ebp-98]
00437EA8 |. 8D45 F0 lea eax,dword ptr ss:[ebp-10]
00437EAB |. BA 02000000 mov edx,2
00437EB0 |. E8 1BF60A00 call <屏录专家.@System@AnsiString@$bdtr$qqrv>
00437EB5 |. 66:C785 5CFFFFFF 2C00 mov word ptr ss:[ebp-A4],2C
00437EBE |. 8D45 EC lea eax,dword ptr ss:[ebp-14]
00437EC1 |. E8 4A9AFCFF call <屏录专家.unknown_libname_37>
00437EC6 |. 8BD0 mov edx,eax
00437EC8 |. FF85 68FFFFFF inc dword ptr ss:[ebp-98]
00437ECE |. 8B8D 48FFFFFF mov ecx,dword ptr ss:[ebp-B8]
00437ED4 |. 8B81 F0020000 mov eax,dword ptr ds:[ecx+2F0]
00437EDA |. E8 A9840500 call <屏录专家.@TControl@GetText$qqrv> ;取机器码
00437EDF |. 8D45 EC lea eax,dword ptr ss:[ebp-14]
;**eax->机器码
00437EE2 |. E8 F1DDFCFF call <屏录专家.@System@AnsiString@c_str$xqqrv>
00437EE7 |. 50 push eax
00437EE8 |. 8D95 00FFFFFF lea edx,dword ptr ss:[ebp-100]
00437EEE |. 52 push edx
00437EEF |. E8 08400A00 call <屏录专家._strcpy> ;copy 机器码
00437EF4 |. 83C4 08 add esp,8
00437EF7 |. FF8D 68FFFFFF dec dword ptr ss:[ebp-98]
00437EFD |. 8D45 EC lea eax,dword ptr ss:[ebp-14]
00437F00 |. BA 02000000 mov edx,2
00437F05 |. E8 C6F50A00 call <屏录专家.@System@AnsiString@$bdtr$qqrv>
00437F0A |. 33C9 xor ecx,ecx
00437F0C |. 898D 3CFFFFFF mov dword ptr ss:[ebp-C4],ecx

；**********************************************************************************************
00437F12 |> 8B85 3CFFFFFF /mov eax,dword ptr ss:[ebp-C4]
00437F18 |. 8A9405 E8FEFFFF |mov dl,byte ptr ss:[ebp+eax-118] ；[ebp+eax-118]=注册名
00437F1F |. 8B8D 3CFFFFFF |mov ecx,dword ptr ss:[ebp-C4]
00437F25 |. 32940D 00FFFFFF |xor dl,byte ptr ss:[ebp+ecx-100] ；[ebp+ecx-100h]=机器码
00437F2C |. 8B85 3CFFFFFF |mov eax,dword ptr ss:[ebp-C4]
00437F32 |. 889405 18FFFFFF |mov byte ptr ss:[ebp+eax-E8],dl
00437F39 |. 8B95 3CFFFFFF |mov edx,dword ptr ss:[ebp-C4]
00437F3F |. 0FBE8C15 18FFFFFF |movsx ecx,byte ptr ss:[ebp+edx-E8]
00437F47 |. 898D CCFEFFFF |mov dword ptr ss:[ebp-134],ecx
00437F4D |. DB85 CCFEFFFF |fild dword ptr ss:[ebp-134]
00437F53 |. 83C4 F8 |add esp,-8
00437F56 |. DD1C24 |fstp qword ptr ss:[esp]
00437F59 |. E8 02840A00 |call <屏录专家._fabs> ；st=|[ebp-134h]|
00437F5E |. 83C4 08 |add esp,8
00437F61 |. DB85 3CFFFFFF |fild dword ptr ss:[ebp-C4] ；st=[ebp-0C4h]
00437F67 |. DEC9 |fmulp st(1),st ; st=|[ebp-134h]|*[ebp-0C4h]
00437F69 |. DB85 40FFFFFF |fild dword ptr ss:[ebp-C0] ；st=[ebp-0C0h]
00437F6F |. DEC1 |faddp st(1),st ; st=|[ebp-134h]|*[ebp-0C4h]+[ebp-0C0h]
00437F71 |. E8 12840A00 |call <屏录专家.@_ftol$qv> ; eax=st
00437F76 |. 8985 40FFFFFF |mov dword ptr ss:[ebp-C0],eax
00437F7C |. FF85 3CFFFFFF |inc dword ptr ss:[ebp-C4]
00437F82 |. 83BD 3CFFFFFF 14 |cmp dword ptr ss:[ebp-C4],14 ;20位
00437F89 |.^ 7C 87 \jl short 屏录专家.00437F12

;假设这段程序输出为temp_H
static char n[14]="123"//注册名
static char m[14]="38289378"//机器码
int count;
int temp_H;

temp_H=0;
for count=0 to 14h do
{
temp_H=|n[count] xor m[count]|*count+temp_H
}

；************************************************************************************************
00437F8B |. 8185 40FFFFFF 39300000 add dword ptr ss:[ebp-C0],3039
00437F95 |. FFB5 40FFFFFF push dword ptr ss:[ebp-C0]
00437F9B |. 68 57B85000 push 屏录专家.0050B857
00437FA0 |. 8D95 18FFFFFF lea edx,dword ptr ss:[ebp-E8]
00437FA6 |. 52 push edx
00437FA7 |. E8 F8690A00 call <屏录专家._sprintf> ；把temp_H转为十进制temp_D
(十六进)temp_H------->(十进制)temp_D
；**********************************************************************************************
00437FAC |. 83C4 0C add esp,0C
00437FAF |. 66:C785 5CFFFFFF 3800 mov word ptr ss:[ebp-A4],38
00437FB8 |. 8D45 E8 lea eax,dword ptr ss:[ebp-18]
00437FBB |. E8 5099FCFF call <屏录专家.unknown_libname_37>
00437FC0 |. 8BD0 mov edx,eax
00437FC2 |. FF85 68FFFFFF inc dword ptr ss:[ebp-98]
00437FC8 |. 8B8D 48FFFFFF mov ecx,dword ptr ss:[ebp-B8]
00437FCE |. 8B81 E4020000 mov eax,dword ptr ds:[ecx+2E4]
00437FD4 |. E8 AF830500 call <屏录专家.@TControl@GetText$qqrv> ;取注册码
00437FD9 |. 8D45 E8 lea eax,dword ptr ss:[ebp-18]
;**EAX-> 注册码
00437FDC |. E8 F7DCFCFF call <屏录专家.@System@AnsiString@c_str$xqqrv>
00437FE1 |. 50 push eax
00437FE2 |. 8D95 D0FEFFFF lea edx,dword ptr ss:[ebp-130]
00437FE8 |. 52 push edx
00437FE9 |. E8 0E3F0A00 call <屏录专家._strcpy> ;COPY 取注册码

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