強大反調試cm的奇葩破解

系統 ： Windows xp

程序 ： Crackme-xp

程序下載地址 ：http://pan.baidu.com/s/1slUwmVr

要求 ： 編寫註冊機

使用工具 ： OD & IDA

可在看雪論壇中查找關於此程序的破文：傳送門

 

這是一個擁有強大反調試機制的cm，沒法查詢到關鍵子串、下獲取窗口文本的斷點沒用，設置對按鈕下消息斷點都沒用。

而後用IDA打開後卻發現了函數表裏有：

 

。。。。。。。。。。。。。。。。。。

這個懂點英文的人都能看出來是 註冊按鈕的處理函數吧？因此前面那麼多防禦機制是爲了什麼？

 

直接定位關鍵代碼：

00401444  /.  55            push    ebp                              ; btn_click
00401445  |.  8BEC          mov ebp, esp 00401447  |.  81C4 70FFFFFF add     esp, -90
0040144D  |.  8995 78FFFFFF mov     dword ptr [ebp-88], edx 00401453  |.  8985 7CFFFFFF mov     dword ptr [ebp-84], eax 00401459  |.  B8 04654300   mov     eax, 00436504
0040145E  |.  E8 71CC0200   call    0042E0D4
00401463  |.  66:C745 90 08>mov     word ptr [ebp-70], 8
00401469  |.  8D45 FC       lea     eax, dword ptr [ebp-4] 0040146C  |.  E8 87050000   call    004019F8
00401471  |.  FF45 9C       inc     dword ptr [ebp-64] 00401474  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
0040147A  |.  66:C745 90 20>mov     word ptr [ebp-70], 20
00401480  |.  8D45 F8       lea     eax, dword ptr [ebp-8] 00401483  |.  E8 70050000   call    004019F8
00401488  |.  FF45 9C       inc     dword ptr [ebp-64] 0040148B  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
00401491  |.  66:C745 90 2C>mov     word ptr [ebp-70], 2C 00401497  |.  8D45 F4       lea eax, dword ptr [ebp-C] 0040149A  |.  E8 59050000   call    004019F8
0040149F  |.  FF45 9C       inc     dword ptr [ebp-64] 004014A2  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
004014A8  |.  66:C745 90 38>mov     word ptr [ebp-70], 38
004014AE  |.  8D45 F0       lea     eax, dword ptr [ebp-10] 004014B1  |.  E8 42050000   call    004019F8
004014B6  |.  FF45 9C       inc     dword ptr [ebp-64] 004014B9  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
004014BF  |.  66:C745 90 44>mov     word ptr [ebp-70], 44
004014C5  |.  8D45 EC       lea     eax, dword ptr [ebp-14] 004014C8  |.  E8 2B050000   call    004019F8
004014CD  |.  FF45 9C       inc     dword ptr [ebp-64] 004014D0  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
004014D6  |.  66:C745 90 50>mov     word ptr [ebp-70], 50
004014DC  |.  8D45 E8       lea     eax, dword ptr [ebp-18] 004014DF  |.  E8 14050000   call    004019F8
004014E4  |.  FF45 9C       inc     dword ptr [ebp-64] 004014E7  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
004014ED  |.  66:C745 90 5C>mov     word ptr [ebp-70], 5C 004014F3  |.  8D45 E4       lea eax, dword ptr [ebp-1C] 004014F6  |.  E8 FD040000   call    004019F8
004014FB  |.  8BD0          mov edx, eax 004014FD  |.  FF45 9C       inc     dword ptr [ebp-64] 00401500  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 00401506  |.  8B81 F0010000 mov eax, dword ptr [ecx+1F0] 0040150C  |.  E8 8B940000   call    0040A99C
00401511  |.  8D55 E4       lea edx, dword ptr [ebp-1C] 00401514  |.  8D45 EC       lea     eax, dword ptr [ebp-14] 00401517  |.  E8 0BE20000   call    0040F727
0040151C  |.  FF4D 9C       dec     dword ptr [ebp-64] 0040151F  |.  8D45 E4       lea eax, dword ptr [ebp-1C] 00401522  |.  BA 02000000   mov     edx, 2
00401527  |.  E8 CCE10000   call    0040F6F8
0040152C  |.  66:C745 90 68>mov     word ptr [ebp-70], 68
00401532  |.  8D45 E0       lea     eax, dword ptr [ebp-20] 00401535  |.  E8 BE040000   call    004019F8
0040153A  |.  8BD0          mov edx, eax 0040153C  |.  FF45 9C       inc     dword ptr [ebp-64] 0040153F  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 00401545  |.  8B81 F4010000 mov eax, dword ptr [ecx+1F4] 0040154B  |.  E8 4C940000   call    0040A99C
00401550  |.  8D55 E0       lea     edx, dword ptr [ebp-20] 00401553  |.  8D45 E8       lea     eax, dword ptr [ebp-18] 00401556  |.  E8 CCE10000   call    0040F727
0040155B  |.  FF4D 9C       dec     dword ptr [ebp-64] 0040155E  |.  8D45 E0       lea     eax, dword ptr [ebp-20] 00401561  |.  BA 02000000   mov     edx, 2
00401566  |.  E8 8DE10000   call    0040F6F8
0040156B  |.  66:C745 90 74>mov     word ptr [ebp-70], 74
00401571  |.  8D45 DC       lea     eax, dword ptr [ebp-24] 00401574  |.  E8 7F040000   call    004019F8
00401579  |.  8BD0          mov edx, eax 0040157B  |.  FF45 9C       inc     dword ptr [ebp-64] 0040157E  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 00401584  |.  8B81 D0010000 mov eax, dword ptr [ecx+1D0] 0040158A  |.  E8 0D940000   call    0040A99C
0040158F  |.  8D55 DC       lea     edx, dword ptr [ebp-24] 00401592  |.  8D45 FC       lea     eax, dword ptr [ebp-4] 00401595  |.  E8 8DE10000   call    0040F727
0040159A  |.  FF4D 9C       dec     dword ptr [ebp-64] 0040159D  |.  8D45 DC       lea     eax, dword ptr [ebp-24] 004015A0  |.  BA 02000000   mov     edx, 2
004015A5  |.  E8 4EE10000   call    0040F6F8
004015AA  |.  66:C745 90 80>mov     word ptr [ebp-70], 80
004015B0  |.  8D45 D8       lea     eax, dword ptr [ebp-28] 004015B3  |.  E8 40040000   call    004019F8
004015B8  |.  8BD0          mov edx, eax 004015BA  |.  FF45 9C       inc     dword ptr [ebp-64] 004015BD  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 004015C3  |.  8B81 D4010000 mov eax, dword ptr [ecx+1D4] 004015C9  |.  E8 CE930000   call    0040A99C
004015CE  |.  8D55 D8       lea     edx, dword ptr [ebp-28] 004015D1  |.  8D45 F8       lea     eax, dword ptr [ebp-8] 004015D4  |.  E8 4EE10000   call    0040F727
004015D9  |.  FF4D 9C       dec     dword ptr [ebp-64] 004015DC  |.  8D45 D8       lea     eax, dword ptr [ebp-28] 004015DF  |.  BA 02000000   mov     edx, 2
004015E4  |.  E8 0FE10000   call    0040F6F8
004015E9  |.  66:C745 90 8C>mov     word ptr [ebp-70], 8C 004015EF  |.  8D45 D4       lea eax, dword ptr [ebp-2C] 004015F2  |.  E8 01040000   call    004019F8
004015F7  |.  50            push eax 004015F8  |.  FF45 9C       inc     dword ptr [ebp-64] 004015FB  |.  8D45 F8       lea     eax, dword ptr [ebp-8] 004015FE  |.  B9 03000000   mov     ecx, 3
00401603  |.  33D2          xor edx, edx 00401605  |.  E8 69EB0000   call    00410173
0040160A  |.  8D45 D4       lea     eax, dword ptr [ebp-2C]          ; (initial cpu selection)
0040160D  |.  8D55 EC       lea     edx, dword ptr [ebp-14] 00401610  |.  E8 C3E10000   call    0040F7D8                         ; 判斷call
00401615  |.  50            push    eax                              ; 壓入函數結果
00401616  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401619  |.  8D45 D4       lea eax, dword ptr [ebp-2C] 0040161C  |.  BA 02000000   mov     edx, 2
00401621  |.  E8 D2E00000   call    0040F6F8
00401626  |.  59            pop ecx 00401627  |.  84C9          test    cl, cl                           ; 測試的是棧頂元素，因此壓入元素的函數就是判斷函數
00401629  |.  0F84 26030000 je      00401955
0040162F  |.  66:C745 90 98>mov     word ptr [ebp-70], 98
00401635  |.  8D45 D0       lea     eax, dword ptr [ebp-30] 00401638  |.  E8 BB030000   call    004019F8
0040163D  |.  50            push eax 0040163E  |.  FF45 9C       inc     dword ptr [ebp-64] 00401641  |.  8D45 F8       lea     eax, dword ptr [ebp-8] 00401644  |.  E8 09E30000   call    0040F952
00401649  |.  8BD0          mov edx, eax 0040164B  |.  83C2 FC       add     edx, -4
0040164E  |.  8D45 F8       lea     eax, dword ptr [ebp-8] 00401651  |.  B9 05000000   mov     ecx, 5
00401656  |.  E8 18EB0000   call    00410173
0040165B  |.  8D45 D0       lea     eax, dword ptr [ebp-30] 0040165E  |.  8D55 E8       lea     edx, dword ptr [ebp-18] 00401661  |.  E8 72E10000   call    0040F7D8                         ; 判斷call
00401666  |.  50            push    eax                              ; 壓入函數結果
00401667  |.  FF4D 9C       dec     dword ptr [ebp-64] 0040166A  |.  8D45 D0       lea     eax, dword ptr [ebp-30] 0040166D  |.  BA 02000000   mov     edx, 2
00401672  |.  E8 81E00000   call    0040F6F8
00401677  |.  59            pop ecx 00401678  |.  84C9          test cl, cl 0040167A  |.  0F84 D5020000 je      00401955
00401680  |.  33C0          xor eax, eax 00401682  |.  8985 74FFFFFF mov dword ptr [ebp-8C], eax 00401688  |.  66:C745 90 14>mov     word ptr [ebp-70], 14
0040168E  |.  33D2          xor edx, edx 00401690  |.  8995 70FFFFFF mov     dword ptr [ebp-90], edx 00401696  |.  EB 1E         jmp     short 004016B6
00401698  |>  8D45 FC       /lea     eax, dword ptr [ebp-4] 0040169B  |.  E8 88030000   |call    00401A28
004016A0  |.  8B95 70FFFFFF |mov     edx, dword ptr [ebp-90] 004016A6  |.  0FBE0C10      |movsx   ecx, byte ptr [eax+edx]         ; 迭代用戶名字符串
004016AA  |.  018D 74FFFFFF |add     dword ptr [ebp-8C], ecx         ; 累加
004016B0  |.  FF85 70FFFFFF |inc     dword ptr [ebp-90]              ; 循環變量自增
004016B6  |>  8D45 FC        lea     eax, dword ptr [ebp-4] 004016B9  |.  E8 94E20000   |call    0040F952                        ; 獲取長度
004016BE  |.  3B85 70FFFFFF |cmp     eax, dword ptr [ebp-90]         ; 遍歷完畢？
004016C4  |.^ 7F D2         \jg      short 00401698
004016C6  |.  8B95 74FFFFFF mov     edx, dword ptr [ebp-8C]          ; 獲取累加結果
004016CC  |.  0FAF95 74FFFF>imul edx, dword ptr [ebp-8C] 004016D3  |.  81C2 AC000000 add     edx, 0AC
004016D9  |.  8995 74FFFFFF mov     dword ptr [ebp-8C], edx          ; 保存結果
004016DF  |.  66:C745 90 A4>mov     word ptr [ebp-70], 0A4
004016E5  |.  8D45 CC       lea     eax, dword ptr [ebp-34] 004016E8  |.  8B95 74FFFFFF mov edx, dword ptr [ebp-8C] 004016EE  |.  E8 32DF0000   call    0040F625
004016F3  |.  FF45 9C       inc     dword ptr [ebp-64] 004016F6  |.  8D55 CC       lea     edx, dword ptr [ebp-34] 004016F9  |.  8D45 F4       lea eax, dword ptr [ebp-C] 004016FC  |.  E8 26E00000   call    0040F727
00401701  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401704  |.  8D45 CC       lea     eax, dword ptr [ebp-34] 00401707  |.  BA 02000000   mov     edx, 2
0040170C  |.  E8 E7DF0000   call    0040F6F8
00401711  |.  66:C745 90 B0>mov     word ptr [ebp-70], 0B0
00401717  |.  8D45 C8       lea     eax, dword ptr [ebp-38] 0040171A  |.  E8 D9020000   call    004019F8
0040171F  |.  8BC8          mov ecx, eax 00401721  |.  FF45 9C       inc     dword ptr [ebp-64] 00401724  |.  8D55 F4       lea edx, dword ptr [ebp-C] 00401727  |.  8D45 EC       lea     eax, dword ptr [ebp-14] 0040172A  |.  E8 20E00000   call    0040F74F
0040172F  |.  8D55 C8       lea     edx, dword ptr [ebp-38] 00401732  |.  52            push edx 00401733  |.  8D45 C4       lea eax, dword ptr [ebp-3C] 00401736  |.  E8 BD020000   call    004019F8
0040173B  |.  8BC8          mov ecx, eax 0040173D  |.  FF45 9C       inc     dword ptr [ebp-64] 00401740  |.  8D55 E8       lea     edx, dword ptr [ebp-18] 00401743  |.  58            pop eax 00401744  |.  E8 06E00000   call    0040F74F
00401749  |.  8D55 C4       lea edx, dword ptr [ebp-3C] 0040174C  |.  8D45 F0       lea     eax, dword ptr [ebp-10] 0040174F  |.  E8 D3DF0000   call    0040F727
00401754  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401757  |.  8D45 C4       lea eax, dword ptr [ebp-3C] 0040175A  |.  BA 02000000   mov     edx, 2
0040175F  |.  E8 94DF0000   call    0040F6F8
00401764  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401767  |.  8D45 C8       lea     eax, dword ptr [ebp-38] 0040176A  |.  BA 02000000   mov     edx, 2
0040176F  |.  E8 84DF0000   call    0040F6F8
00401774  |.  8D55 F0       lea     edx, dword ptr [ebp-10] 00401777  |.  8D45 F8       lea     eax, dword ptr [ebp-8] 0040177A  |.  E8 59E00000   call    0040F7D8                         ; 判斷call
0040177F  |.  84C0          test al, al 00401781  |.  0F84 CE010000 je      00401955
00401787  |.  66:C745 90 BC>mov     word ptr [ebp-70], 0BC
0040178D  |.  8D45 C0       lea     eax, dword ptr [ebp-40] 00401790  |.  E8 63020000   call    004019F8
00401795  |.  FF45 9C       inc     dword ptr [ebp-64] 00401798  |.  66:C745 90 C8>mov     word ptr [ebp-70], 0C8
0040179E  |.  66:C745 90 D4>mov     word ptr [ebp-70], 0D4
004017A4  |.  8D45 BC       lea     eax, dword ptr [ebp-44] 004017A7  |.  E8 4C020000   call    004019F8
004017AC  |.  FF45 9C       inc     dword ptr [ebp-64] 004017AF  |.  66:C745 90 C8>mov     word ptr [ebp-70], 0C8
004017B5  |.  66:C745 90 E0>mov     word ptr [ebp-70], 0E0
004017BB  |.  8D45 B8       lea     eax, dword ptr [ebp-48] 004017BE  |.  E8 35020000   call    004019F8
004017C3  |.  FF45 9C       inc     dword ptr [ebp-64] 004017C6  |.  66:C745 90 C8>mov     word ptr [ebp-70], 0C8
004017CC  |.  66:C745 90 EC>mov     word ptr [ebp-70], 0EC
004017D2  |.  8D45 B4       lea eax, dword ptr [ebp-4C] 004017D5  |.  E8 1E020000   call    004019F8
004017DA  |.  FF45 9C       inc     dword ptr [ebp-64] 004017DD  |.  66:C745 90 C8>mov     word ptr [ebp-70], 0C8
004017E3  |.  66:C745 90 F8>mov     word ptr [ebp-70], 0F8
004017E9  |.  8D45 B0       lea     eax, dword ptr [ebp-50] 004017EC  |.  E8 07020000   call    004019F8
004017F1  |.  8BD0          mov edx, eax 004017F3  |.  FF45 9C       inc     dword ptr [ebp-64] 004017F6  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 004017FC  |.  8B81 E0010000 mov eax, dword ptr [ecx+1E0] 00401802  |.  E8 95910000   call    0040A99C
00401807  |.  8D55 B0       lea     edx, dword ptr [ebp-50] 0040180A  |.  8D45 C0       lea     eax, dword ptr [ebp-40] 0040180D  |.  E8 15DF0000   call    0040F727
00401812  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401815  |.  8D45 B0       lea     eax, dword ptr [ebp-50] 00401818  |.  BA 02000000   mov     edx, 2
0040181D  |.  E8 D6DE0000   call    0040F6F8
00401822  |.  66:C745 90 04>mov     word ptr [ebp-70], 104
00401828  |.  8D45 AC       lea     eax, dword ptr [ebp-54] 0040182B  |.  E8 C8010000   call    004019F8
00401830  |.  8BD0          mov edx, eax 00401832  |.  FF45 9C       inc     dword ptr [ebp-64] 00401835  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 0040183B  |.  8B81 E4010000 mov eax, dword ptr [ecx+1E4] 00401841  |.  E8 56910000   call    0040A99C
00401846  |.  8D55 AC       lea     edx, dword ptr [ebp-54] 00401849  |.  8D45 BC       lea     eax, dword ptr [ebp-44] 0040184C  |.  E8 D6DE0000   call    0040F727
00401851  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401854  |.  8D45 AC       lea     eax, dword ptr [ebp-54] 00401857  |.  BA 02000000   mov     edx, 2
0040185C  |.  E8 97DE0000   call    0040F6F8
00401861  |.  66:C745 90 10>mov     word ptr [ebp-70], 110
00401867  |.  8D45 A8       lea     eax, dword ptr [ebp-58] 0040186A  |.  E8 89010000   call    004019F8
0040186F  |.  8BD0          mov edx, eax 00401871  |.  FF45 9C       inc     dword ptr [ebp-64] 00401874  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 0040187A  |.  8B81 E8010000 mov eax, dword ptr [ecx+1E8] 00401880  |.  E8 17910000   call    0040A99C
00401885  |.  8D55 A8       lea     edx, dword ptr [ebp-58] 00401888  |.  8D45 B8       lea     eax, dword ptr [ebp-48] 0040188B  |.  E8 97DE0000   call    0040F727
00401890  |.  FF4D 9C       dec     dword ptr [ebp-64] 00401893  |.  8D45 A8       lea     eax, dword ptr [ebp-58] 00401896  |.  BA 02000000   mov     edx, 2
0040189B  |.  E8 58DE0000   call    0040F6F8
004018A0  |.  66:C745 90 1C>mov     word ptr [ebp-70], 11C 004018A6  |.  8D45 A4       lea eax, dword ptr [ebp-5C] 004018A9  |.  E8 4A010000   call    004019F8
004018AE  |.  8BD0          mov edx, eax 004018B0  |.  FF45 9C       inc     dword ptr [ebp-64] 004018B3  |.  8B0D E0AE4300 mov ecx, dword ptr [43AEE0] 004018B9  |.  8B81 EC010000 mov eax, dword ptr [ecx+1EC] 004018BF  |.  E8 D8900000   call    0040A99C
004018C4  |.  8D55 A4       lea edx, dword ptr [ebp-5C] 004018C7  |.  8D45 B4       lea eax, dword ptr [ebp-4C] 004018CA  |.  E8 58DE0000   call    0040F727
004018CF  |.  FF4D 9C       dec     dword ptr [ebp-64] 004018D2  |.  8D45 A4       lea eax, dword ptr [ebp-5C] 004018D5  |.  BA 02000000   mov     edx, 2
004018DA  |.  E8 19DE0000   call    0040F6F8
004018DF  |.  6A 00         push    0
004018E1  |.  8D45 BC       lea     eax, dword ptr [ebp-44] 004018E4  |.  E8 3F010000   call    00401A28
004018E9  |.  50            push eax 004018EA  |.  8D45 C0       lea     eax, dword ptr [ebp-40] 004018ED  |.  E8 36010000   call    00401A28
004018F2  |.  50            push    eax                              ; |Text
004018F3  |.  6A 00         push    0                                ; |hOwner = NULL
004018F5  |.  E8 A63A0300   call    <jmp.&USER32.MessageBoxA>        ; \MessageBoxA
004018FA  |.  6A 40         push    40
004018FC  |.  8D45 B4       lea eax, dword ptr [ebp-4C] 004018FF  |.  E8 24010000   call    00401A28
00401904  |.  50            push eax 00401905  |.  8D45 B8       lea     eax, dword ptr [ebp-48] 00401908  |.  E8 1B010000   call    00401A28
0040190D  |.  50            push    eax                              ; |Text
0040190E  |.  6A 00         push    0                                ; |hOwner = NULL
00401910  |.  E8 8B3A0300   call    <jmp.&USER32.MessageBoxA>        ; \MessageBoxA

其中判斷call的代碼：

0040F7D8  /$  55            push ebp 0040F7D9  |.  8BEC          mov ebp, esp 0040F7DB  |.  53            push ebx 0040F7DC  |.  8B00          mov eax, dword ptr [eax] 0040F7DE  |.  8B12          mov edx, dword ptr [edx] 0040F7E0  |.  E8 B7640100   call    00425C9C                         ; 兩個字符串是否相同？
0040F7E5  |.  0F94C0        sete al 0040F7E8  |.  83E0 01       and     eax, 1
0040F7EB  |.  5B            pop ebx 0040F7EC  |.  5D            pop ebp 0040F7ED  \.  C3            retn

就是一個很簡單的加密，直接打開http://www.cnblogs.com/ZRBYYXDM/p/5115596.html中搭建的框架，修改OnBtnDecrypt函數以下：

void CKengen_TemplateDlg::OnBtnDecrypt() { // TODO: Add your control notification handler code here CString str;     GetDlgItemText( IDC_EDIT_NAME,str ); //獲取用戶名字串基本信息。
    int len = str.GetLength();  DWORD Res = 0;     if ( len != 0 ){ //格式控制。 unsigned sum = 0;         for ( int i = 0 ; i != len ; i++ )
            sum += str[i];  CString PassWord;         PassWord.Format( "CA-%d-3914",sum * sum + 0xAC );         SetDlgItemText( IDC_EDIT_PASSWORD,PassWord );  } else MessageBox( "用戶名格式錯誤！" ); }

再在OnInitDialog中添加此代碼修改標題：SetWindowText(_T("Keygen"));

運行效果：