一次苦中作乐的追码过程(下)

004EFD55 |. 8D45 CC lea eax,[local.13]

004EFD58 |. 8B4D EC mov ecx,[local.5] ; 假码第5位

004EFD5B |. BA E0FF4E00 mov edx,PrivacyE.004EFFE0 ; $

004EFD60 |. E8 0B4DF1FF call PrivacyE.00404A70

004EFD65 |. 8B45 CC mov eax,[local.13] ; 合并后$5

004EFD68 |. BA FFFF0000 mov edx,0xFFFF

004EFD6D |. E8 0298F1FF call PrivacyE.00409574

004EFD72 |. 8BF0 mov esi,eax ; 5转16进制 记为M2

004EFD74 |. 81FE FFFF0000 cmp esi,0xFFFF

004EFD7A |. 0F84 FC010000 je PrivacyE.004EFF7C

004EFD80 |. 8B45 F8 mov eax,[local.2] ; 机器码

004EFD83 |. E8 9C4CF1FF call PrivacyE.00404A24

004EFD88 |. 3BF0 cmp esi,eax ; 机器码长度和M2对比

004EFD8A |. 74 15 je short PrivacyE.004EFDA1

004EFD8C |. 8B45 F8 mov eax,[local.2] ; 机器码

004EFD8F |. E8 904CF1FF call PrivacyE.00404A24

004EFD94 |. 83F8 10 cmp eax,0x10 ; 机器码长度和16对比

004EFD97 |. 7E 08 jle short PrivacyE.004EFDA1 ; 这里必须要跳走

004EFD99 |. 85F6 test esi,esi

004EFD9B |. 0F85 DB010000 jnz PrivacyE.004EFF7C

004EFDA1 |> 8D45 E0 lea eax,[local.8]

004EFDA4 |. 8B55 F4 mov edx,[local.3] ; 假码

004EFDA7 |. 8A52 06 mov dl,byte ptr ds:[edx+0x6] ; 假码[7]

004EFDAA |. 8850 01 mov byte ptr ds:[eax+0x1],dl

004EFDAD |. C600 01 mov byte ptr ds:[eax],0x1 ; [eax]指向下一位假码

004EFDB0 |. 8D55 E0 lea edx,[local.8]

004EFDB3 |. 8D45 DC lea eax,[local.9]

004EFDB6 |. E8 5133F1FF call PrivacyE.0040310C

004EFDBB |. 8D45 D8 lea eax,[local.10]

004EFDBE |. 8B55 F4 mov edx,[local.3]

004EFDC1 |. 8A52 08 mov dl,byte ptr ds:[edx+0x8] ; 假码[9]

004EFDC4 |. 8850 01 mov byte ptr ds:[eax+0x1],dl

004EFDC7 |. C600 01 mov byte ptr ds:[eax],0x1

004EFDCA |. 8D55 D8 lea edx,[local.10]

004EFDCD |. 8D45 DC lea eax,[local.9]

004EFDD0 |. B1 02 mov cl,0x2

004EFDD2 |. E8 0533F1FF call PrivacyE.004030DC

004EFDD7 |. 8D55 DC lea edx,[local.9] ; 假码[7] 和假码[9]合并 这里为79

004EFDDA |. 8D45 D4 lea eax,[local.11]

004EFDDD |. E8 2A33F1FF call PrivacyE.0040310C

004EFDE2 |. 8D45 D8 lea eax,[local.10]

004EFDE5 |. 8B55 F4 mov edx,[local.3] ; 假码

004EFDE8 |. 8A52 0A mov dl,byte ptr ds:[edx+0xA] ; 假码[11]

004EFDEB |. 8850 01 mov byte ptr ds:[eax+0x1],dl

004EFDEE |. C600 01 mov byte ptr ds:[eax],0x1

004EFDF1 |. 8D55 D8 lea edx,[local.10]

004EFDF4 |. 8D45 D4 lea eax,[local.11]

004EFDF7 |. B1 03 mov cl,0x3

004EFDF9 |. E8 DE32F1FF call PrivacyE.004030DC

004EFDFE |. 8D55 D4 lea edx,[local.11] ; 假码[7] 假码[9] 假码[11] 合并 79B

004EFE01 |. 8D45 F0 lea eax,[local.4]

004EFE04 |. E8 BF4BF1FF call PrivacyE.004049C8

004EFE09 |. 8D45 C8 lea eax,[local.14]

004EFE0C |. 8B4D F0 mov ecx,[local.4] ; 79B

004EFE0F |. BA E0FF4E00 mov edx,PrivacyE.004EFFE0 ; $

004EFE14 |. E8 574CF1FF call PrivacyE.00404A70

004EFE19 |. 8B45 C8 mov eax,[local.14] ; $79B

004EFE1C |. BA FFFF0000 mov edx,0xFFFF

004EFE21 |. E8 4E97F1FF call PrivacyE.00409574

004EFE26 |. 8945 E8 mov [local.6],eax ; $79B转16进制 0000079B 记为M3

004EFE29 |. 817D E8 FFFF0>cmp [local.6],0xFFFF ; M3和0xFFFF对比

004EFE30 |. 0F84 46010000 je PrivacyE.004EFF7C

004EFE36 |. 33F6 xor esi,esi

004EFE38 |. 8B45 F8 mov eax,[local.2] ; 机器码

004EFE3B |. E8 E44BF1FF call PrivacyE.00404A24

004EFE40 |. 85C0 test eax,eax ; 对比机器码长度是否为空

004EFE42 |. 7E 13 jle short PrivacyE.004EFE57

004EFE44 |. BB 01000000 mov ebx,0x1

004EFE49 |> 8B55 F8 /mov edx,[local.2] ; 机器码

004EFE4C |. 0FB6541A FF |movzx edx,byte ptr ds:[edx+ebx-0x1] ; 指向机器码的每一个字节

004EFE51 |. 03F2 |add esi,edx ; esi=机器码相加后的结果 记为K k=203

004EFE53 |. 43 |inc ebx

004EFE54 |. 48 |dec eax

004EFE55 |.^ 75 F2 \jnz short PrivacyE.004EFE49

004EFE57 |> C1E6 04 shl esi,0x4 ; 00000203左移4位 等于00002030 记为K1

004EFE5A |. 8B45 FC mov eax,[local.1]

004EFE5D |. 3370 74 xor esi,dword ptr ds:[eax+0x74] ; 03C9642B和K1 xor 结果记为K2 K2=03C9441B

004EFE60 |. 81E6 FF0F0000 and esi,0xFFF ; K2和0xFFFand 记为K3

004EFE66 |. 8975 E4 mov [local.7],esi ; K3=41B

004EFE69 |. 8B45 E4 mov eax,[local.7]

004EFE6C |. 3B45 E8 cmp eax,[local.6] ; K3和M3比较 不相等就跳

004EFE6F |. 0F85 07010000 jnz PrivacyE.004EFF7C ; 所以一定要K3=M3

 

小结:

1.假码[5]转16进制 记为M2

2.Len和M2对比,

3.假码[7] 假码[9] 假码[11] 合并 记为M3 M3=79B

4.M3转16进制后和K3对比 一定要实现M3=K3

5.K3=41B 所以M3=41B 得出 假码[7]=4 假码[9]=1 假码[11]=B

假码更新为:E2D255481AB3DEFG

004EFE75 |. 8B45 F4 mov eax,[local.3] ; 假码

004EFE78 |. E8 A74BF1FF call PrivacyE.00404A24 ; 获取注册码长度

004EFE7D |. 83F8 0C cmp eax,0xC ; 注册码长度和12比较

004EFE80 |. 0F8E E9000000 jle PrivacyE.004EFF6F

004EFE86 |. 8D45 EC lea eax,[local.5]

004EFE89 |. E8 D648F1FF call PrivacyE.00404764

004EFE8E |. 33C0 xor eax,eax

004EFE90 |. 8945 E4 mov [local.7],eax

004EFE93 |. 8B45 F8 mov eax,[local.2] ; 机器码

004EFE96 |. E8 894BF1FF call PrivacyE.00404A24

004EFE9B |. 85C0 test eax,eax ; 对比机器码长度是否为空

004EFE9D |. 7E 14 jle short PrivacyE.004EFEB3

004EFE9F |. BB 01000000 mov ebx,0x1

004EFEA4 |> 8B55 F8 /mov edx,[local.2] ; 机器码

004EFEA7 |. 0FB6541A FF |movzx edx,byte ptr ds:[edx+ebx-0x1]

004EFEAC |. 0155 E4 |add [local.7],edx ; 机器码所有字节相加存到一个变量中 变量=203

004EFEAF |. 43 |inc ebx

004EFEB0 |. 48 |dec eax

004EFEB1 |.^ 75 F1 \jnz short PrivacyE.004EFEA4

004EFEB3 |> B8 FFFFFF07 mov eax,0x7FFFFFF ; x

004EFEB8 |. 99 cdq

004EFEB9 |. F77D E4 idiv [local.7] ; 134217727÷515=260616.....487

004EFEBC |. F76D E4 imul [local.7] ; 260616×515=134217240

004EFEBF |. 8945 E4 mov [local.7],eax

004EFEC2 |. 8B45 F4 mov eax,[local.3] ; 注册码

004EFEC5 |. E8 5A4BF1FF call PrivacyE.00404A24

004EFECA |. 83E8 0C sub eax,0xC ; 注册码长度-12=4

004EFECD |. 8945 E8 mov [local.6],eax

004EFED0 |. 8D45 F0 lea eax,[local.4]

004EFED3 |. 50 push eax

004EFED4 |. 8B4D E8 mov ecx,[local.6]

004EFED7 |. BA 0D000000 mov edx,0xD

004EFEDC |. 8B45 F4 mov eax,[local.3] ; 注册码

004EFEDF |. E8 A04DF1FF call PrivacyE.00404C84

004EFEE4 |. BF 1F000000 mov edi,0x1F

004EFEE9 |. BB 01000000 mov ebx,0x1

004EFEEE |> 8BCB /mov ecx,ebx

004EFEF0 |. 8B45 FC |mov eax,[local.1]

004EFEF3 |. 8B40 78 |mov eax,dword ptr ds:[eax+0x78]

004EFEF6 |. 8BF0 |mov esi,eax

004EFEF8 |. D3E6 |shl esi,cl

004EFEFA |. 8BCF |mov ecx,edi

004EFEFC |. D3E8 |shr eax,cl

004EFEFE |. 0BF0 |or esi,eax

004EFF00 |. 8BC6 |mov eax,esi

004EFF02 |. 99 |cdq

004EFF03 |. 33C2 |xor eax,edx

004EFF05 |. 2BC2 |sub eax,edx

004EFF07 |. 8BF0 |mov esi,eax

004EFF09 |. 3B75 E4 |cmp esi,[local.7] ; PrivacyE.004F0611

004EFF0C |. 7E 0A |jle short PrivacyE.004EFF18

004EFF0E |. 8BC6 |mov eax,esi

004EFF10 |. 99 |cdq

004EFF11 |. F77D E4 |idiv [local.7] ; PrivacyE.004F0611

004EFF14 |. 8BF2 |mov esi,edx

004EFF16 |. EB 08 |jmp short PrivacyE.004EFF20

004EFF18 |> 8B45 E4 |mov eax,[local.7] ; PrivacyE.004F0611

004EFF1B |. 99 |cdq

004EFF1C |. F7FE |idiv esi

004EFF1E |. 8BF2 |mov esi,edx

004EFF20 |> 8D4D C4 |lea ecx,[local.15]

004EFF23 |. 8BC6 |mov eax,esi

004EFF25 |. 25 FF0F0000 |and eax,0xFFF

004EFF2A |. BA 03000000 |mov edx,0x3

004EFF2F |. E8 DC95F1FF |call PrivacyE.00409510 这段主要循环计算得出一堆字符串 这堆字符串后面有用

004EFF34 |. 8B55 C4 |mov edx,[local.15] ; 0F40F46C86C80881104089F85400999E65B3B658B17CFF9EBDCC9F4DA9B4550C880208F174E083105727CCAF9DBDEF7F 记为str

004EFF37 |. 8D45 EC |lea eax,[local.5]

004EFF3A |. E8 ED4AF1FF |call PrivacyE.00404A2C

004EFF3F |. 4F |dec edi

004EFF40 |. 43 |inc ebx

004EFF41 |. 83FB 21 |cmp ebx,0x21 循环33次

004EFF44 |.^ 75 A8 \jnz short PrivacyE.004EFEEE

004EFF46 |. 8D45 EC lea eax,[local.5]

004EFF49 |. 50 push eax

004EFF4A |. 8B45 FC mov eax,[local.1]

004EFF4D |. 8B48 6C mov ecx,dword ptr ds:[eax+0x6C] ; 14

004EFF50 |. 83E9 0C sub ecx,0xC ; 14-C=8

004EFF53 |. BA 01000000 mov edx,0x1

004EFF58 |. 8B45 EC mov eax,[local.5] ; str=0F40F46C86C80881104089F85400999E65B3B658B17CFF9EBDCC9F4DA9B4550C880208F174E083105727CCAF9DBDEF7F

004EFF5B |. E8 244DF1FF call PrivacyE.00404C84 ; 拿出str 8位字符寸

004EFF60 |. 8B55 EC mov edx,[local.5] ; 0F40F46C 记为str1

004EFF63 |. 8B45 F0 mov eax,[local.4] ; 拿出假码第13位以后的字符 DFEG记为M4

004EFF66 |. E8 2990F1FF call PrivacyE.00408F94 ; str1和M4比较 不一样的话就实现跳转 这里不能跳,所以得出str1=M4

004EFF6B |. 85C0 test eax,eax

004EFF6D |. 75 0D jnz short PrivacyE.004EFF7C

004EFF6F |> 8B45 08 mov eax,[arg.1] ; PrivacyE.004F0C8F

004EFF72 |. BA ECFF4E00 mov edx,PrivacyE.004EFFEC ; 645364631365423154824

004EFF77 |. E8 3C48F1FF call PrivacyE.004047B8

004EFF7C |> 33C0 xor eax,eax

004EFF7E |. 5A pop edx ; PrivacyE.004F05C4

004EFF7F |. 59 pop ecx ; PrivacyE.004F05C4

004EFF80 |. 59 pop ecx ; PrivacyE.004F05C4

004EFF81 |. 64:8910 mov dword ptr fs:[eax],edx

004EFF84 |. 68 ABFF4E00 push PrivacyE.004EFFAB

004EFF89 |> 8D45 C4 lea eax,[local.15]

004EFF8C |. BA 04000000 mov edx,0x4

004EFF91 |. E8 F247F1FF call PrivacyE.00404788

004EFF96 |. 8D45 EC lea eax,[local.5]

004EFF99 |. BA 04000000 mov edx,0x4

004EFF9E |. E8 E547F1FF call PrivacyE.00404788

004EFFA3 \. C3 retn

004EFFA4 .^ E9 3340F1FF jmp PrivacyE.00403FDC

004EFFA9 .^ EB DE jmp short PrivacyE.004EFF89

004EFFAB . 5F pop edi ; PrivacyE.004F05C4

004EFFAC . 5E pop esi ; PrivacyE.004F05C4

004EFFAD . 5B pop ebx ; PrivacyE.004F05C4

004EFFAE . 8BE5 mov esp,ebp

004EFFB0 . 5D pop ebp ; PrivacyE.004F05C4

004EFFB1 . C2 0400 retn 0x4

 

小结:其实这段可以很清楚的看到假码第13位以后的字符一定要和str1相等,否则的话就注册失败。

所以最终注册码为 :E2D255481AB30F40F46C

一次苦中作乐的追码过程(下) - a103368520 - 星空之上学crack

 

关于这个注册机问题,因为这个软件的算法设计到其他未知变量,所以写注册机比较麻烦,要知道的参数比较多才行,比如str这个字符串是怎么计算出来的,因为最后会用到这个,所以写注册机的问题自己解决吧,

其实追码的教程也是一种享受!苦中作乐。

 

 

总结:完成这个追码教程弄了我几天,不过都是断断续续的再研究,每次研究不超过一小时,虽然有参考别人的文章,但是现在你所看到的整篇算法分析都是我自己写的,比原作者还要详细,当然这里肯定要先感谢原作者,

提供了一篇很好的分析文章,其实要有耐心,其实纵观全篇文章,其实这个算法并不难,主要还是有耐心分析下去才行,一开始我看原作者的前面的年月日的分析,我也搞不明白是什么意思,但是经过自己多次调试

和分析后,终于弄明白了,而且弄明白后,后面的问题也是迎刃而解,软件作者写的算法是一步接着一步来的,第一步走错了,就会全盘皆输。还有这个软件不是直接出真码的,是把真码拆分开来,一步一步来进行

对比。至此,研究了这么一个软件,令我收益颇多。

 

高清文档下载地址:http://www.vdisk.cn/down/index/19613980

posted @ 2018-09-06 20:50  Sendige  阅读(225)  评论(0编辑  收藏  举报