Cisco某个学习资料

标题：简单算法——Cisco某个学习资料
作者：fly
时间：2003/04/14 12:36pm
链接：http://bbs.pediy.com

简单算法——某个学习资料(FileOpen保护）

下载地址：http://www.helpexam.com/dow/UpLoad/640-910.exe
软件大小：566K

【软件简介】：某个考试的资料。呵呵，我不考某某认证，没用过。

【软件限制】：必须注册

【作者声明】：初学Crack，只是感兴趣，没有其它目的。失误之处敬请诸位大侠赐教！

【破解工具】：TRW2000娃娃修改版、Ollydbg1.09、PEiD、W32Dasm 10修改版

—————————————————————————————————
【过程】：

640-910.exe 无壳。Visual C++编写。

呵呵，终于有足够的时间来看几个程序了。
fnila兄出手真快，早已搞定了这个东东，我所做的只是再记录一下而已。
另外，程序有好几处大幅度的“星际跳跃”，如果没有fnila 兄的指点，我肯定会晕头转向的。

Product ID ：1000630011
Input String：QTMRRMRJT
试炼码：RSTUVWXYZ

—————————————————————————————————

* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:0040779A(C), :00407828(C), :00407831(C)
|
:0040784D 837C241409 cmp dword ptr [esp+14], 00000009
:00407852 7565 jne 004078B9

* Possible StringData Ref from Data Obj ->"692837429"
|
:00407854 68744C4100 push 00414C74
:00407859 BF109E4100 mov edi, 00419E10
====>EDI=QTMRRMRJT Input String

:0040785E C7056440410001000000 mov dword ptr [00414064], 00000001
:00407868 6860724100 push 00417260
:0040786D E8EE0E0000 call 00408760
====>还原我的硬盘序列号！

:00407872 83C408 add esp, 00000008
:00407875 B9FFFFFFFF mov ecx, FFFFFFFF
:0040787A 2BC0 sub eax, eax
:0040787C F2 repnz
:0040787D AE scasb
:0040787E F7D1 not ecx
:00407880 2BF9 sub edi, ecx
:00407882 8BC1 mov eax, ecx
:00407884 C1E902 shr ecx, 02
:00407887 8BF7 mov esi, edi
====>ESI=EDI=555490825

:00407889 BF20A04100 mov edi, 0041A020
:0040788E F3 repz
:0040788F A5 movsd
:00407890 8BC8 mov ecx, eax
:00407892 6820A04100 push 0041A020
:00407897 83E103 and ecx, 00000003
:0040789A 6840B04100 push 0041B040
:0040789F F3 repz
:004078A0 A4 movsb
:004078A1 E8BA0E0000 call 00408760
====>和上面还原硬盘序列号的算法相同！
用我输入的试炼码和硬盘序列号计算得出一组新值！

:004078A6 83C408 add esp, 00000008
:004078A9 68109E4100 push 00419E10
:004078AE 6800B14100 push 0041B100

* Reference To: KERNEL32.lstrcpyA, Ord:0296h
|
:004078B3 FF150CD34100 Call dword ptr [0041D30C]

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00407852(C)
|
:004078B9 682A994100 push 0041992A

* Reference To: KERNEL32.lstrlenA, Ord:029Ch
|
:004078BE FF1510D34100 Call dword ptr [0041D310]
:004078C4 83F802 cmp eax, 00000002
:004078C7 7E4A jle 00407913
====>跳走！

…… ……省略…… ……

:00407B3F BE00B14100 mov esi, 0041B100
====>ESI=789;7A:A?

:00407B44 BFB6874100 mov edi, 004187B6
====>EDI=000630011 是Product ID的后9位

:00407B49 B909000000 mov ecx, 00000009
:00407B4E F3 repz
:00407B4F A6 cmpsb
====>比较是否相同！

:00407B50 7525 jne 00407B77
====>跳则OVER！

:00407B52 6A01 push 00000001
:00407B54 53 push ebx

* Reference To: USER32.EndDialog, Ord:00B4h
|
:00407B55 FF154CD44100 Call dword ptr [0041D44C]
:00407B5B C7058840410000000000 mov dword ptr [00414088], 00000000
:00407B65 6A00 push 00000000

* Reference To: USER32.PostQuitMessage, Ord:01B3h
|
:00407B67 FF1558D44100 Call dword ptr [0041D458]
:00407B6D B801000000 mov eax, 00000001
:00407B72 E9F80A0000 jmp 0040866F

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00407B50(C)
|
:00407B77 BE00B14100 mov esi, 0041B100
:00407B7C BFB6874100 mov edi, 004187B6
:00407B81 B909000000 mov ecx, 00000009
:00407B86 F3 repz
:00407B87 A6 cmpsb
:00407B88 746E je 00407BF8
:00407B8A 6A01 push 00000001
:00407B8C 53 push ebx

* Reference To: USER32.EndDialog, Ord:00B4h
|
:00407B8D FF154CD44100 Call dword ptr [0041D44C]
:00407B93 833D4440410001 cmp dword ptr [00414044], 00000001
:00407B9A 7530 jne 00407BCC
:00407B9C 6A10 push 00000010

* Possible StringData Ref from Data Obj ->"Authorization Failure"
|
:00407B9E 68644B4100 push 00414B64

* Possible StringData Ref from Data Obj ->"22"
|
:00407BA3 68004B4100 push 00414B00
:00407BA8 6A00 push 00000000
:00407BAA FFD5 call ebp
:00407BAC 6A10 push 00000010

* Possible StringData Ref from Data Obj ->"OldstyleExpAuthString"
|
:00407BAE 68E84A4100 push 00414AE8
:00407BB3 6800B14100 push 0041B100
:00407BB8 6A00 push 00000000
:00407BBA FFD5 call ebp
:00407BBC 6A10 push 00000010

* Possible StringData Ref from Data Obj ->"fo.OldstyleServiceNumberString"
|
:00407BBE 68C84A4100 push 00414AC8
:00407BC3 68B6874100 push 004187B6
:00407BC8 6A00 push 00000000
:00407BCA FFD5 call ebp

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00407B9A(C)
|
:00407BCC 6A10 push 00000010

* Possible StringData Ref from Data Obj ->"Authorization Failure"
|
:00407BCE 68644B4100 push 00414B64

* Possible StringData Ref from Data Obj ->"The string you entered is incorrect."
====>BAD BOY！

—————————————————————————————————
两次进入call 00408760

* Referenced by a CALL at Addresses:
|:00403FD5 , :004040A1 , :0040786D , :004078A1 , :004078DD
|:00407935 , :00407969 , :00407990 , :004079C4 , :00407A0C
|:00407A33 , :00407A6E , :00407DA6
|
:00408760 8B542404 mov edx, dword ptr [esp+04]
====>EDX=QTMRRMRJT

:00408764 83EC04 sub esp, 00000004
:00408767 53 push ebx
:00408768 56 push esi
:00408769 57 push edi
:0040876A 33DB xor ebx, ebx
:0040876C 55 push ebp
:0040876D 85D2 test edx, edx
:0040876F 746A je 004087DB
:00408771 8B74241C mov esi, dword ptr [esp+1C]
====>ESI=692837429

:00408775 3BF3 cmp esi, ebx
:00408777 7462 je 004087DB
:00408779 8BFA mov edi, edx
====>EDI=EDX=QTMRRMRJT

:0040877B B9FFFFFFFF mov ecx, FFFFFFFF
:00408780 2BC0 sub eax, eax
:00408782 F2 repnz
:00408783 AE scasb
:00408784 F7D1 not ecx
:00408786 49 dec ecx
:00408787 8BFE mov edi, esi
:00408789 2BC0 sub eax, eax
:0040878B 894C2410 mov dword ptr [esp+10], ecx
:0040878F B9FFFFFFFF mov ecx, FFFFFFFF
:00408794 F2 repnz
:00408795 AE scasb
:00408796 F7D1 not ecx
:00408798 49 dec ecx
:00408799 33FF xor edi, edi
:0040879B 395C2410 cmp dword ptr [esp+10], ebx
:0040879F 7E26 jle 004087C7

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004087C5(C)
|
:004087A1 3BF9 cmp edi, ecx
:004087A3 7C02 jl 004087A7
:004087A5 33FF xor edi, edi

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004087A3(C)
|
:004087A7 0FBE041A movsx eax, byte ptr [edx+ebx]
一、 ====>依次取QTMRRMRJT字符的HEX值
1、 ====>EAX=51
2、 ====>EAX=54
3、 ====>EAX=4D
4、 ====>EAX=52
5、 ====>EAX=52
6、 ====>EAX=4D
7、 ====>EAX=52
8、 ====>EAX=4A
9、 ====>EAX=54
———————————————————————————
二、 ====>依次取RSTUVWXYZ字符的HEX值
…… ……省略…… ……

:004087AB 0FBE2C3E movsx ebp, byte ptr [esi+edi]
一、 ====>依次取692837429字符的HEX值
1、 ====>EBP=36
2、 ====>EBP=39
3、 ====>EBP=32
4、 ====>EBP=38
5、 ====>EBP=33
6、 ====>EBP=37
7、 ====>EBP=34
8、 ====>EBP=32
9、 ====>EBP=39
———————————————————————————
二、 ====>依次取555490825字符的HEX值
…… ……省略…… ……

:004087AF 2BC5 sub eax, ebp
一、 1、 ====>EAX=51 - 36=1B
2、 ====>EAX=54 - 39=1B
3、 ====>EAX=4D - 32=1B
4、 ====>EAX=52 - 38=1A
5、 ====>EAX=52 - 33=1F
6、 ====>EAX=4D - 37=16
7、 ====>EAX=52 - 34=1E
8、 ====>EAX=4A - 32=18
9、 ====>EAX=54 - 39=1B
———————————————————————————
二、 1、 ====>EAX=52 - 35=1D
2、 ====>EAX=53 - 35=1E
3、 ====>EAX=54 - 35=1F
4、 ====>EAX=55 - 34=21
5、 ====>EAX=56 - 39=1D
6、 ====>EAX=57 - 30=27
7、 ====>EAX=58 - 38=20
8、 ====>EAX=59 - 32=27
9、 ====>EAX=5A - 35=25

:004087B1 83F841 cmp eax, 00000041
:004087B4 7D03 jge 004087B9
:004087B6 83C01A add eax, 0000001A
一、 1、 ====>EAX=1B + 1A=35
2、 ====>EAX=1B + 1A=35
3、 ====>EAX=1B + 1A=35
4、 ====>EAX=1A + 1A=34
5、 ====>EAX=1F + 1A=39
6、 ====>EAX=16 + 1A=30
7、 ====>EAX=1E + 1A=38
8、 ====>EAX=18 + 1A=32
9、 ====>EAX=1B + 1A=35
———————————————————————————
二、 1、 ====>EAX=1D + 1A=37
2、 ====>EAX=1E + 1A=38
3、 ====>EAX=1F + 1A=39
4、 ====>EAX=21 + 1A=3B
5、 ====>EAX=1D + 1A=37
6、 ====>EAX=27 + 1A=41
7、 ====>EAX=20 + 1A=3A
8、 ====>EAX=27 + 1A=41
9、 ====>EAX=25 + 1A=3F

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004087B4(C)
|
:004087B9 8883109E4100 mov byte ptr [ebx+00419E10], al
====>AL 保存在 [ebx+00419E10]处
一、 ====>循环9次后得出555490825，呵呵，正是我硬盘序列号！
———————————————————————————
二、 ====>循环9次后得出789;7A:A? 这组字符进行比较！

:004087BF 47 inc edi
:004087C0 43 inc ebx
:004087C1 3B5C2410 cmp ebx, dword ptr [esp+10]
:004087C5 7CDA jl 004087A1
====>循环9次！

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040879F(C)
|
:004087C7 B801000000 mov eax, 00000001
:004087CC 5D pop ebp
:004087CD C683109E410000 mov byte ptr [ebx+00419E10], 00
:004087D4 5F pop edi
:004087D5 5E pop esi
:004087D6 5B pop ebx
:004087D7 83C404 add esp, 00000004
:004087DA C3 ret

—————————————————————————————————
【简单求逆】：

程序将硬盘序列号和我输入的试炼码进行简单运算，然后与产品ID的后9位比较，若相同就OK了！
因此，我的目标是：000630011

:004087B6 83C01A add eax, 0000001A

1、 ====>EAX=1D + 1A=37 ①、30 - 1A=16
2、 ====>EAX=1E + 1A=38 ②、30 - 1A=16
3、 ====>EAX=1F + 1A=39 ③、30 - 1A=16
4、 ====>EAX=21 + 1A=3B ④、36 - 1A=1C
5、 ====>EAX=1D + 1A=37 ⑤、33 - 1A=19
6、 ====>EAX=27 + 1A=41 ⑥、30 - 1A=16
7、 ====>EAX=20 + 1A=3A ⑦、30 - 1A=16
8、 ====>EAX=27 + 1A=41 ⑧、31 - 1A=17
9、 ====>EAX=25 + 1A=3F ⑨、31 - 1A=17

:004087AF 2BC5 sub eax, ebp

1、 ====>EAX=52 - 35=1D ①、16 + 35=4B
2、 ====>EAX=53 - 35=1E ②、16 + 35=4B
3、 ====>EAX=54 - 35=1F ③、16 + 35=4B
4、 ====>EAX=55 - 34=21 ④、1C + 34=50
5、 ====>EAX=56 - 39=1D ⑤、19 + 39=52
6、 ====>EAX=57 - 30=27 ⑥、16 + 30=46
7、 ====>EAX=58 - 38=20 ⑦、16 + 38=4E
8、 ====>EAX=59 - 32=27 ⑧、17 + 32=49
9、 ====>EAX=5A - 35=25 ⑨、17 + 35=4C

所以，我的注册码应为：KKKPRFNIL

—————————————————————————————————
【注册信息保存】：

注册成功后会在目录下生成一个同名的pdf文件。

—————————————————————————————————
【整理】：

Product ID：1000630011
Input String：QTMRRMRJT
Authorization：KKKPRFNIL

—————————————————————————————————

Cracked By 巢水工作坊——fly【OCN】

2003-10-11 0:38