287 lines
16 KiB
Markdown
287 lines
16 KiB
Markdown
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算密钥
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先上算法：
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```c#
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//判断空判断长度这里省略
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public static string CalcSerial(string name)
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{
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int name_length = name.Length;
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int esi = 0x18;
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int ebx = 0x400;
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int ebp = 0x32;
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int ecx = name_length;
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int eax, edx, edi, v10 = 0;
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foreach (char c in name)
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{
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eax = c;
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eax += 0x56B;
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edx = eax;
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edx ^= 0x890428;
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esi += edx;
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edx = name[3];
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if (ecx <= 9)
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{
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edx += ecx;
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edx ^= 0x209;
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edx *= esi;
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ebx += edx;
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}
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else
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{
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edx += ecx;
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edx ^= 0x209;
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edx *= ebx;
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esi += edx;
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}
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edx = eax;
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edx <<= 7;
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edx += eax;
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eax += edx * 8;
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v10 = ebx + eax * 4;
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ebx = v10; //first loop not run
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}
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string temp = name;
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for (edi = 5; edi > 0; edi--)
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{
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eax = temp[edi];
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ebp = eax + ebp + 0x134A;
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temp = Fun_403c80(temp);
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}
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string temp2 = temp; //edx
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edi = 1;
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for (ebx = 5; ebx > 0; ebx--)
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{
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ecx = temp2[0];
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eax = temp2[edi];
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eax += 0x23;
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ebp += ecx + 0x134A;
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ecx = eax * 3;
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ecx *= 5;
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edx = ecx * 5;
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eax += edx * 4;
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esi += eax * 2;
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temp2 = Fun_403c80(temp2);
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edi++;
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}
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edx = temp2[5];
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eax = 0x18;
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ecx = v10;
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eax -= edx;
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ebp += ecx;
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edx = temp2[2];
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eax ^= ebp;
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esi += 0x3c;
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int eax2 = 0x1337;
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eax2 -= edx;
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eax2 ^= esi;
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return $"LNT-{eax2}-{eax}"; //user32._wsprintfA(edx,"%s-%d-%d","LNT",eax2,eax); //esi
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}
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//反转字符串
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public static string Fun_403c80(string name)
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{
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return new string(name.Reverse().ToArray());
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}
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```
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测试密钥：
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```
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chenx221
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LNT-72236375--441384786
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```
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细节：
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```assembly
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00401130 | 0F85 36020000 | jne keygen.40136C |
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00401136 | 8B9424 78010000 | mov edx,dword ptr ss:[esp+178] | edx:EntryPoint
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0040113D | 8D4C24 18 | lea ecx,dword ptr ss:[esp+18] | ecx:EntryPoint
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00401141 | 6A 32 | push 32 |
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00401143 | 51 | push ecx | ecx:EntryPoint
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00401144 | 68 E8030000 | push 3E8 |
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00401149 | 52 | push edx | edx:EntryPoint
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0040114A | FF15 9C404000 | call dword ptr ds:[<GetDlgItemText |
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00401150 | 8D7C24 18 | lea edi,dword ptr ss:[esp+18] | Name
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00401154 | 83C9 FF | or ecx,FFFFFFFF | ecx:EntryPoint
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00401157 | 33C0 | xor eax,eax |
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00401159 | F2:AE | repne scasb |
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0040115B | F7D1 | not ecx | ecx:EntryPoint
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0040115D | 49 | dec ecx | ecx:EntryPoint
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0040115E | 83F9 05 | cmp ecx,5 | ecx:EntryPoint
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00401161 | 7D 29 | jge keygen.40118C | name.length > 4
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00401163 | 8B8424 78010000 | mov eax,dword ptr ss:[esp+178] |
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0040116A | 6A 30 | push 30 |
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0040116C | 68 F0504000 | push keygen.4050F0 | 4050F0:"Cerberus Keygen"
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00401171 | 68 A4504000 | push keygen.4050A4 | 4050A4:"Sorry name must be over 4 characters"
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00401176 | 50 | push eax |
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00401177 | FF15 98404000 | call dword ptr ds:[<MessageBoxA>] |
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0040117D | 5F | pop edi | edi:EntryPoint
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0040117E | 5E | pop esi | esi:EntryPoint
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0040117F | 5D | pop ebp |
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00401180 | 33C0 | xor eax,eax |
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00401182 | 5B | pop ebx |
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00401183 | 81C4 64010000 | add esp,164 |
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00401189 | C2 1000 | ret 10 |
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0040118C | 33FF | xor edi,edi | edi:EntryPoint
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0040118E | 85C9 | test ecx,ecx | ecx:EntryPoint
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00401190 | 7E 56 | jle keygen.4011E8 |
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00401192 | EB 04 | jmp keygen.401198 |
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00401194 | 8B5C24 10 | mov ebx,dword ptr ss:[esp+10] | loop start
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00401198 | 0FBE443C 18 | movsx eax,byte ptr ss:[esp+edi+18] |
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0040119D | 05 6B050000 | add eax,56B |
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004011A2 | 8BD0 | mov edx,eax | edx:EntryPoint
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004011A4 | 81F2 28048900 | xor edx,890428 | edx:EntryPoint
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004011AA | 03F2 | add esi,edx | esi:EntryPoint, edx:EntryPoint
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004011AC | 83F9 09 | cmp ecx,9 | length
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004011AF | 0FBE5424 1B | movsx edx,byte ptr ss:[esp+1B] | edx:EntryPoint
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004011B4 | 7E 0F | jle keygen.4011C5 |
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004011B6 | 03D1 | add edx,ecx | edx:EntryPoint, ecx:EntryPoint
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004011B8 | 81F2 09020000 | xor edx,209 | edx:EntryPoint
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004011BE | 0FAFD3 | imul edx,ebx | edx:EntryPoint
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004011C1 | 03F2 | add esi,edx | esi:EntryPoint, edx:EntryPoint
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004011C3 | EB 0D | jmp keygen.4011D2 |
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004011C5 | 03D1 | add edx,ecx | edx:EntryPoint, ecx:EntryPoint
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004011C7 | 81F2 09020000 | xor edx,209 | edx:EntryPoint
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004011CD | 0FAFD6 | imul edx,esi | edx:EntryPoint, esi:EntryPoint
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004011D0 | 03DA | add ebx,edx | edx:EntryPoint
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004011D2 | 8BD0 | mov edx,eax | edx:EntryPoint
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004011D4 | C1E2 07 | shl edx,7 | edx:EntryPoint
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004011D7 | 03D0 | add edx,eax | edx:EntryPoint
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004011D9 | 47 | inc edi | edi:EntryPoint
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004011DA | 3BF9 | cmp edi,ecx | edi:EntryPoint, ecx:EntryPoint
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004011DC | 8D04D0 | lea eax,dword ptr ds:[eax+edx*8] |
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004011DF | 8D1483 | lea edx,dword ptr ds:[ebx+eax*4] | edx:EntryPoint
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004011E2 | 895424 10 | mov dword ptr ss:[esp+10],edx | [esp+10]:___RtlUserThreadStart@8+2B, edx:EntryPoint
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004011E6 | 7C AC | jl keygen.401194 | next loop
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004011E8 | BF 05000000 | mov edi,5 | edi:EntryPoint
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004011ED | 0FBE443C 18 | movsx eax,byte ptr ss:[esp+edi+18] |
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004011F2 | 8D4C24 18 | lea ecx,dword ptr ss:[esp+18] | ecx:EntryPoint
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004011F6 | 51 | push ecx | ecx:EntryPoint
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004011F7 | 8DAC28 4A130000 | lea ebp,dword ptr ds:[eax+ebp+134A |
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004011FE | E8 7D2A0000 | call keygen.403C80 |
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00401203 | 83C4 04 | add esp,4 |
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00401206 | 4F | dec edi | edi:EntryPoint
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00401207 | 85FF | test edi,edi | edi:EntryPoint
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00401209 | 7F E2 | jg keygen.4011ED |
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0040120B | 8D543C 18 | lea edx,dword ptr ss:[esp+edi+18] | edx:EntryPoint
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0040120F | 8D7C24 19 | lea edi,dword ptr ss:[esp+19] | edi:EntryPoint
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00401213 | 895424 14 | mov dword ptr ss:[esp+14],edx | edx:EntryPoint
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00401217 | BB 05000000 | mov ebx,5 |
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0040121C | 8B4424 14 | mov eax,dword ptr ss:[esp+14] |
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00401220 | 0FBE08 | movsx ecx,byte ptr ds:[eax] | ecx:EntryPoint
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00401223 | 0FBE07 | movsx eax,byte ptr ds:[edi] | edi:EntryPoint
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00401226 | 83C0 23 | add eax,23 |
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00401229 | 8DAC29 4A130000 | lea ebp,dword ptr ds:[ecx+ebp+134A |
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00401230 | 8D0C40 | lea ecx,dword ptr ds:[eax+eax*2] | ecx:EntryPoint
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00401233 | 8D0C89 | lea ecx,dword ptr ds:[ecx+ecx*4] | ecx:EntryPoint
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00401236 | 8D1489 | lea edx,dword ptr ds:[ecx+ecx*4] | edx:EntryPoint
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00401239 | 8D4C24 18 | lea ecx,dword ptr ss:[esp+18] | ecx:EntryPoint
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0040123D | 51 | push ecx | ecx:EntryPoint
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0040123E | 8D0490 | lea eax,dword ptr ds:[eax+edx*4] |
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00401241 | 8D3446 | lea esi,dword ptr ds:[esi+eax*2] | esi:EntryPoint
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00401244 | E8 372A0000 | call keygen.403C80 |
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00401249 | 83C4 04 | add esp,4 |
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0040124C | 47 | inc edi | edi:EntryPoint
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0040124D | 4B | dec ebx |
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0040124E | 75 CC | jne keygen.40121C |
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00401250 | 0FBE5424 1D | movsx edx,byte ptr ss:[esp+1D] | edx:EntryPoint
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00401255 | 8B4C24 10 | mov ecx,dword ptr ss:[esp+10] | ecx:EntryPoint, [esp+10]:___RtlUserThreadStart@8+2B
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00401259 | B8 18000000 | mov eax,18 |
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0040125E | 2BC2 | sub eax,edx | edx:EntryPoint
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00401260 | 03E9 | add ebp,ecx | ecx:EntryPoint
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00401262 | 0FBE5424 1A | movsx edx,byte ptr ss:[esp+1A] | edx:EntryPoint
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00401267 | 33C5 | xor eax,ebp |
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00401269 | 83C6 3C | add esi,3C | esi:EntryPoint
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0040126C | 50 | push eax |
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0040126D | B8 37130000 | mov eax,1337 |
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00401272 | 2BC2 | sub eax,edx | edx:EntryPoint
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00401274 | 8D8C24 B0000000 | lea ecx,dword ptr ss:[esp+B0] | ecx:EntryPoint
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0040127B | 33C6 | xor eax,esi | esi:EntryPoint
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0040127D | 8D9424 14010000 | lea edx,dword ptr ss:[esp+114] | edx:EntryPoint
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00401284 | 50 | push eax |
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00401285 | 51 | push ecx | ecx:EntryPoint
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00401286 | 68 98504000 | push keygen.405098 | 405098:"%s-%d-%d"
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0040128B | 52 | push edx | edx:EntryPoint
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0040128C | FF15 A0404000 | call dword ptr ds:[<wsprintfA>] |
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00401292 | 8BBC24 8C010000 | mov edi,dword ptr ss:[esp+18C] | edi:EntryPoint
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00401299 | 8B35 9C404000 | mov esi,dword ptr ds:[<GetDlgItemT | esi:EntryPoint
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0040129F | 83C4 14 | add esp,14 |
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004012A2 | 8D4424 48 | lea eax,dword ptr ss:[esp+48] |
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004012A6 | 6A 64 | push 64 |
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004012A8 | 50 | push eax |
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004012A9 | 68 EA030000 | push 3EA |
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004012AE | 57 | push edi | edi:EntryPoint
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004012AF | FFD6 | call esi | esi:EntryPoint
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004012B1 | 8D4C24 48 | lea ecx,dword ptr ss:[esp+48] | serial
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004012B5 | 6A 64 | push 64 |
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004012B7 | 51 | push ecx | ecx:EntryPoint
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004012B8 | 68 EA030000 | push 3EA |
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004012BD | 57 | push edi | edi:EntryPoint
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004012BE | FFD6 | call esi | esi:EntryPoint
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004012C0 | 85C0 | test eax,eax |
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004012C2 | 75 22 | jne keygen.4012E6 | serial不能为空
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004012C4 | 6A 30 | push 30 |
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004012C6 | 68 F0504000 | push keygen.4050F0 | 4050F0:"Cerberus Keygen"
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004012CB | 68 7C504000 | push keygen.40507C | 40507C:"You have to enter a serial"
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004012D0 | 57 | push edi | edi:EntryPoint
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004012D1 | FF15 98404000 | call dword ptr ds:[<MessageBoxA>] |
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004012D7 | 5F | pop edi | edi:EntryPoint
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004012D8 | 5E | pop esi | esi:EntryPoint
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004012D9 | 5D | pop ebp |
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004012DA | 33C0 | xor eax,eax |
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004012DC | 5B | pop ebx |
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004012DD | 81C4 64010000 | add esp,164 |
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004012E3 | C2 1000 | ret 10 |
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004012E6 | 8DB424 10010000 | lea esi,dword ptr ss:[esp+110] | esi:EntryPoint
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004012ED | 8D4424 48 | lea eax,dword ptr ss:[esp+48] |
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004012F1 | 8A10 | mov dl,byte ptr ds:[eax] |
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004012F3 | 8A1E | mov bl,byte ptr ds:[esi] | esi:EntryPoint
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004012F5 | 8ACA | mov cl,dl |
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004012F7 | 3AD3 | cmp dl,bl |
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004012F9 | 75 1E | jne keygen.401319 |
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004012FB | 84C9 | test cl,cl |
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004012FD | 74 16 | je keygen.401315 |
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004012FF | 8A50 01 | mov dl,byte ptr ds:[eax+1] |
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00401302 | 8A5E 01 | mov bl,byte ptr ds:[esi+1] |
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00401305 | 8ACA | mov cl,dl |
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00401307 | 3AD3 | cmp dl,bl |
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00401309 | 75 0E | jne keygen.401319 |
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0040130B | 83C0 02 | add eax,2 |
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0040130E | 83C6 02 | add esi,2 | esi:EntryPoint
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00401311 | 84C9 | test cl,cl |
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00401313 | 75 DC | jne keygen.4012F1 |
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00401315 | 33C0 | xor eax,eax |
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00401317 | EB 05 | jmp keygen.40131E |
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00401319 | 1BC0 | sbb eax,eax |
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0040131B | 83D8 FF | sbb eax,FFFFFFFF |
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0040131E | 85C0 | test eax,eax |
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00401320 | 75 25 | jne keygen.401347 |
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00401322 | 6A 40 | push 40 |
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00401324 | 68 F0504000 | push keygen.4050F0 | 4050F0:"Cerberus Keygen"
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00401329 | 68 44504000 | push keygen.405044 | 405044:"Good job cracker!\n\nNow write a keygen and a tutorial."
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0040132E | 57 | push edi | edi:EntryPoint
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0040132F | FF15 98404000 | call dword ptr ds:[<MessageBoxA>] |
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00401335 | 5F | pop edi | edi:EntryPoint
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00401336 | 5E | pop esi | esi:EntryPoint
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00401337 | 5D | pop ebp |
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00401338 | B8 01000000 | mov eax,1 |
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0040133D | 5B | pop ebx |
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0040133E | 81C4 64010000 | add esp,164 |
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00401344 | C2 1000 | ret 10 |
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00401347 | 6A 10 | push 10 |
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00401349 | 68 F0504000 | push keygen.4050F0 | 4050F0:"Cerberus Keygen"
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0040134E | 68 30504000 | push keygen.405030 | 405030:"Wrong!\n\nTry again!"
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00401353 | 57 | push edi | edi:EntryPoint
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00401354 | FF15 98404000 | call dword ptr ds:[<MessageBoxA>] |
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0040135A | 5F | pop edi | edi:EntryPoint
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0040135B | 5E | pop esi | esi:EntryPoint
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0040135C | 5D | pop ebp |
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0040135D | B8 01000000 | mov eax,1 |
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00401362 | 5B | pop ebx |
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00401363 | 81C4 64010000 | add esp,164 |
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00401369 | C2 1000 | ret 10 |
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```
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(按钮事件 EP往上翻一点就到了)
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