239 lines
16 KiB
Markdown
239 lines
16 KiB
Markdown
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serial计算方法
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1. 首先看到程序的printf、scanf部分
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```assembly
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00401428 | 83C4 10 | add esp,10 |
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0040142B | 83C4 F4 | add esp,FFFFFFF4 |
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0040142E | 68 70124000 | push babylon keygenme.401270 | 401270:"[x][x] Babylon KeygenMe [x][x] coded by haiklr\n\n"
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00401433 | E8 48040000 | call <JMP.&_printf> |
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00401438 | 83C4 10 | add esp,10 |
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0040143B | 83C4 F4 | add esp,FFFFFFF4 |
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0040143E | 68 A1124000 | push babylon keygenme.4012A1 | 4012A1:"[x] Name : "
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00401443 | E8 38040000 | call <JMP.&_printf> |
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00401448 | 83C4 10 | add esp,10 |
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0040144B | 83C4 F8 | add esp,FFFFFFF8 |
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0040144E | 8D85 E0FEFFFF | lea eax,dword ptr ss:[ebp-120] |
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00401454 | 50 | push eax |
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00401455 | 68 AD124000 | push babylon keygenme.4012AD | 4012AD:"%s"
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0040145A | E8 19040000 | call <JMP.&_scanf> |
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```
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这里让用户输入Name值
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2. 接下来是对Name长度的检查，可以看到Name要求4~14位长度
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```assembly
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0040145F | 83C4 10 | add esp,10 |
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00401462 | 83C4 F4 | add esp,FFFFFFF4 |
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00401465 | 8D85 E0FEFFFF | lea eax,dword ptr ss:[ebp-120] | ebp-120: Name
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0040146B | 50 | push eax |
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0040146C | E8 FF030000 | call <JMP.&_strlen> |
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00401471 | 83C4 10 | add esp,10 |
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00401474 | 8945 E8 | mov dword ptr ss:[ebp-18],eax | ebp-18: Name.Length
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00401477 | 837D E8 03 | cmp dword ptr ss:[ebp-18],3 |
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0040147B | 7E 08 | jle babylon keygenme.401485 | length > 3
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0040147D | 837D E8 0E | cmp dword ptr ss:[ebp-18],E |
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00401481 | 7F 02 | jg babylon keygenme.401485 | length <=14
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00401483 | EB 2B | jmp babylon keygenme.4014B0 |
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00401485 | 83C4 F4 | add esp,FFFFFFF4 | fail
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...
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004014A7 | E9 B4020000 | jmp <babylon keygenme.Bye> |
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004014AC | 8D7426 00 | lea esi,dword ptr ds:[esi] | esi:"悙悙悙悙悙悙悙悙悙悙悙悙悙悙怺x][x] Babylon KeygenMe [x][x] coded by haiklr\n\n"
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004014B0 | 83C4 F4 | add esp,FFFFFFF4 |
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```
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3. 接收用户输入的Serial
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```assembly
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004014B3 | 68 D2124000 | push babylon keygenme.4012D2 | 4012D2:"[x] Serial : "
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004014B8 | E8 C3030000 | call <JMP.&_printf> |
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004014BD | 83C4 10 | add esp,10 |
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004014C0 | 83C4 F8 | add esp,FFFFFFF8 |
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004014C3 | 8D85 A0FAFFFF | lea eax,dword ptr ss:[ebp-560] | ebp-560: Serial
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004014C9 | 50 | push eax |
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004014CA | 68 AD124000 | push babylon keygenme.4012AD | 4012AD:"%s"
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004014CF | E8 A4030000 | call <JMP.&_scanf> |
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```
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4. 接下来开始计算正确的Serial，首先在每位name字符间加入空格
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```assembly
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004014D7 | C745 FC 00000000 | mov dword ptr ss:[ebp-4],0 |
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004014DE | 89F6 | mov esi,esi |
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004014E0 | 8B45 E8 | mov eax,dword ptr ss:[ebp-18] | name每个字符之间插入0x20空格(包括末尾)
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004014E3 | 89C2 | mov edx,eax | edx: Name length
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004014E5 | 8D0412 | lea eax,dword ptr ds:[edx+edx] |
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004014E8 | 3945 FC | cmp dword ptr ss:[ebp-4],eax | 循环条件，ebp-4<2*edx
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004014EB | 7C 03 | jl babylon keygenme.4014F0 |
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004014ED | EB 31 | jmp babylon keygenme.401520 |
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004014EF | 90 | nop |
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004014F0 | 8D85 A0FDFFFF | lea eax,dword ptr ss:[ebp-260] |
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004014F6 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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004014F9 | 8D8D E0FEFFFF | lea ecx,dword ptr ss:[ebp-120] | ecx:_printf+67
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004014FF | 8B5D F8 | mov ebx,dword ptr ss:[ebp-8] |
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00401502 | 8A0C0B | mov cl,byte ptr ds:[ebx+ecx] |
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00401505 | 880C02 | mov byte ptr ds:[edx+eax],cl |
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00401508 | 8B45 FC | mov eax,dword ptr ss:[ebp-4] |
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0040150B | 40 | inc eax |
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0040150C | 8D95 A0FDFFFF | lea edx,dword ptr ss:[ebp-260] | edx:_KiFastSystemCallRet@0
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00401512 | C60410 20 | mov byte ptr ds:[eax+edx],20 | 20:' '
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00401516 | FF45 F8 | inc dword ptr ss:[ebp-8] |
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00401519 | 8345 FC 02 | add dword ptr ss:[ebp-4],2 |
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0040151D | EB C1 | jmp babylon keygenme.4014E0 |
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0040151F | 90 | nop |
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00401520 | 90 | nop |
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```
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5. 这里出场了第二组数据，现在只是每位+1
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```assembly
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00401521 | C745 FC 00000000 | mov dword ptr ss:[ebp-4],0 |
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00401528 | 83C4 F4 | add esp,FFFFFFF4 | 将某串字符串（-[#]]=}&&&+(=$*,,)&.*/+++[][;/..§0)每个字符+1
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0040152B | 8D85 A0FEFFFF | lea eax,dword ptr ss:[ebp-160] |
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00401531 | 50 | push eax |
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00401532 | E8 39030000 | call <JMP.&_strlen> |
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00401537 | 83C4 10 | add esp,10 |
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0040153A | 89C0 | mov eax,eax |
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0040153C | 3945 FC | cmp dword ptr ss:[ebp-4],eax |
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0040153F | 72 02 | jb babylon keygenme.401543 |
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00401541 | EB 2D | jmp babylon keygenme.401570 |
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00401543 | 8D85 A0FEFFFF | lea eax,dword ptr ss:[ebp-160] |
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00401549 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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0040154C | 8D8D A0FEFFFF | lea ecx,dword ptr ss:[ebp-160] | ecx:_printf+67
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00401552 | 8B5D FC | mov ebx,dword ptr ss:[ebp-4] |
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00401555 | 899D 9CFAFFFF | mov dword ptr ss:[ebp-564],ebx |
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0040155B | 8BB5 9CFAFFFF | mov esi,dword ptr ss:[ebp-564] |
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00401561 | 8A1C0E | mov bl,byte ptr ds:[esi+ecx] |
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00401564 | FEC3 | inc bl |
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00401566 | 881C02 | mov byte ptr ds:[edx+eax],bl |
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00401569 | FF45 FC | inc dword ptr ss:[ebp-4] |
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0040156C | EB BA | jmp babylon keygenme.401528 |
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0040156E | 89F6 | mov esi,esi |
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00401570 | 90 | nop |
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```
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6. 第二组数据 Xor 加空格的Name
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```assembly
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00401571 | C745 FC 00000000 | mov dword ptr ss:[ebp-4],0 |
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00401578 | 83C4 F4 | add esp,FFFFFFF4 | 加了空格的Name Xor 加了1的奇怪字符串 放字符串原位
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0040157B | 8D85 A0FDFFFF | lea eax,dword ptr ss:[ebp-260] |
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00401581 | 50 | push eax |
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00401582 | E8 E9020000 | call <JMP.&_strlen> |
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00401587 | 83C4 10 | add esp,10 |
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0040158A | 89C0 | mov eax,eax |
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0040158C | 3945 FC | cmp dword ptr ss:[ebp-4],eax |
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0040158F | 72 02 | jb babylon keygenme.401593 |
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00401591 | EB 41 | jmp babylon keygenme.4015D4 |
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00401593 | 8D85 A0FEFFFF | lea eax,dword ptr ss:[ebp-160] |
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00401599 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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0040159C | 8D8D A0FDFFFF | lea ecx,dword ptr ss:[ebp-260] | ecx:_printf+67
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004015A2 | 8B7D FC | mov edi,dword ptr ss:[ebp-4] |
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004015A5 | 89BD 9CFAFFFF | mov dword ptr ss:[ebp-564],edi |
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004015AB | 8DB5 A0FEFFFF | lea esi,dword ptr ss:[ebp-160] |
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004015B1 | 8B5D FC | mov ebx,dword ptr ss:[ebp-4] |
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004015B4 | 899D 8CFAFFFF | mov dword ptr ss:[ebp-574],ebx |
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004015BA | 8BBD 9CFAFFFF | mov edi,dword ptr ss:[ebp-564] |
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004015C0 | 8A1C0F | mov bl,byte ptr ds:[edi+ecx] |
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004015C3 | 8BBD 8CFAFFFF | mov edi,dword ptr ss:[ebp-574] |
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004015C9 | 321C37 | xor bl,byte ptr ds:[edi+esi] |
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004015CC | 881C02 | mov byte ptr ds:[edx+eax],bl |
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004015CF | FF45 FC | inc dword ptr ss:[ebp-4] |
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004015D2 | EB A4 | jmp babylon keygenme.401578 |
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004015D4 | 90 | nop |
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```
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7. 反转上一步的结果
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```assembly
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004015D8 | 8D85 A0FEFFFF | lea eax,dword ptr ss:[ebp-160] |
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004015DE | 50 | push eax |
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004015DF | E8 8C020000 | call <JMP.&_strlen> |
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004015E4 | 83C4 10 | add esp,10 |
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004015E7 | 89C0 | mov eax,eax |
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004015E9 | 8D50 FF | lea edx,dword ptr ds:[eax-1] | edx:_KiFastSystemCallRet@0
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004015EC | 8955 FC | mov dword ptr ss:[ebp-4],edx | edx:_KiFastSystemCallRet@0
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004015EF | 90 | nop |
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004015F0 | 837D FC 00 | cmp dword ptr ss:[ebp-4],0 | 反转
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004015F4 | 7D 02 | jge babylon keygenme.4015F8 |
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004015F6 | EB 20 | jmp babylon keygenme.401618 |
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004015F8 | 8D85 A0FCFFFF | lea eax,dword ptr ss:[ebp-360] |
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004015FE | 8B55 F4 | mov edx,dword ptr ss:[ebp-C] | edx:_KiFastSystemCallRet@0
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00401601 | 8D8D A0FEFFFF | lea ecx,dword ptr ss:[ebp-160] | ecx:_printf+67
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00401607 | 8B5D FC | mov ebx,dword ptr ss:[ebp-4] |
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0040160A | 8A0C0B | mov cl,byte ptr ds:[ebx+ecx] |
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0040160D | 880C02 | mov byte ptr ds:[edx+eax],cl |
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00401610 | FF45 F4 | inc dword ptr ss:[ebp-C] |
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00401613 | FF4D FC | dec dword ptr ss:[ebp-4] |
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00401616 | EB D8 | jmp babylon keygenme.4015F0 |
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00401618 | 90 | nop |
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```
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8. 反转和没反转的插空放 (如:反转前"abcd" 反转后"dcba" 结果"dacb")
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```assembly
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00401619 | C745 FC 00000000 | mov dword ptr ss:[ebp-4],0 |
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00401620 | 83C4 F4 | add esp,FFFFFFF4 | 将前面未反转的内容插空放进反转内容中
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00401623 | 8D85 A0FCFFFF | lea eax,dword ptr ss:[ebp-360] |
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00401629 | 50 | push eax |
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0040162A | E8 41020000 | call <JMP.&_strlen> |
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0040162F | 83C4 10 | add esp,10 |
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00401632 | 89C0 | mov eax,eax |
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00401634 | 3945 FC | cmp dword ptr ss:[ebp-4],eax |
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00401637 | 72 07 | jb babylon keygenme.401640 |
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00401639 | EB 45 | jmp babylon keygenme.401680 |
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0040163B | 90 | nop |
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0040163C | 8D7426 00 | lea esi,dword ptr ds:[esi] | esi:"悙悙悙悙悙悙悙悙悙悙悙悙悙悙怺x][x] Babylon KeygenMe [x][x] coded by haiklr\n\n"
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00401640 | 8D85 A0FBFFFF | lea eax,dword ptr ss:[ebp-460] |
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00401646 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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00401649 | 8D8D A0FCFFFF | lea ecx,dword ptr ss:[ebp-360] | ecx:_printf+67
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0040164F | 8B5D F0 | mov ebx,dword ptr ss:[ebp-10] |
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00401652 | 8A0C0B | mov cl,byte ptr ds:[ebx+ecx] |
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00401655 | 880C02 | mov byte ptr ds:[edx+eax],cl |
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00401658 | 8B45 FC | mov eax,dword ptr ss:[ebp-4] |
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0040165B | 40 | inc eax |
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0040165C | 8D95 A0FBFFFF | lea edx,dword ptr ss:[ebp-460] | edx:_KiFastSystemCallRet@0
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00401662 | 8D8D A0FEFFFF | lea ecx,dword ptr ss:[ebp-160] | ecx:_printf+67
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00401668 | 8B5D EC | mov ebx,dword ptr ss:[ebp-14] |
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0040166B | 8A0C0B | mov cl,byte ptr ds:[ebx+ecx] |
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0040166E | 880C10 | mov byte ptr ds:[eax+edx],cl |
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00401671 | FF45 F0 | inc dword ptr ss:[ebp-10] |
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00401674 | FF45 EC | inc dword ptr ss:[ebp-14] |
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00401677 | 8345 FC 02 | add dword ptr ss:[ebp-4],2 |
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0040167B | EB A3 | jmp babylon keygenme.401620 |
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0040167D | 8D76 00 | lea esi,dword ptr ds:[esi] | esi:"悙悙悙悙悙悙悙悙悙悙悙悙悙悙怺x][x] Babylon KeygenMe [x][x] coded by haiklr\n\n"
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00401680 | 90 | nop |
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```
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9. 将不可打印字符转成0x36
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```assembly
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00401681 | C745 FC 00000000 | mov dword ptr ss:[ebp-4],0 |
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00401688 | 83C4 F4 | add esp,FFFFFFF4 | 把所有不可打印字符替换成0x36
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0040168B | 8D85 A0FBFFFF | lea eax,dword ptr ss:[ebp-460] |
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00401691 | 50 | push eax |
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00401692 | E8 D9010000 | call <JMP.&_strlen> |
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00401697 | 83C4 10 | add esp,10 |
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0040169A | 89C0 | mov eax,eax |
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0040169C | 3945 FC | cmp dword ptr ss:[ebp-4],eax |
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0040169F | 72 02 | jb babylon keygenme.4016A3 |
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004016A1 | EB 32 | jmp babylon keygenme.4016D5 |
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004016A3 | 8D85 A0FBFFFF | lea eax,dword ptr ss:[ebp-460] |
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004016A9 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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004016AC | 803C02 1F | cmp byte ptr ds:[edx+eax],1F | <=0x1F则替换成0x36
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004016B0 | 7E 11 | jle babylon keygenme.4016C3 |
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004016B2 | 8D85 A0FBFFFF | lea eax,dword ptr ss:[ebp-460] |
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004016B8 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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004016BB | 803C02 7A | cmp byte ptr ds:[edx+eax],7A | 7A:'z'
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004016BF | 7F 02 | jg babylon keygenme.4016C3 | >0x7A则替换成0x36
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004016C1 | EB 0D | jmp babylon keygenme.4016D0 |
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004016C3 | 8D85 A0FBFFFF | lea eax,dword ptr ss:[ebp-460] |
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004016C9 | 8B55 FC | mov edx,dword ptr ss:[ebp-4] | edx:_KiFastSystemCallRet@0
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004016CC | C60402 36 | mov byte ptr ds:[edx+eax],36 | 36:'6'
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004016D0 | FF45 FC | inc dword ptr ss:[ebp-4] |
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004016D3 | EB B3 | jmp babylon keygenme.401688 |
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004016D5 | 90 | nop |
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```
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判断就不放了
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