[原创]WinUtilities 2.0 注册算法分析-软件逆向-看雪-安全社区|安全招聘|kanxue.com

[原创]WinUtilities 2.0 注册算法分析

发表于: 2006-1-25 12:01 5029

[原创]WinUtilities 2.0 注册算法分析

koala

2006-1-25 12:01

5029

【破文标题】  WinUtilities 2.0注册算法分析
【破文作者】  koala
【软件名称】  WinUtilities V2.0
【下载地址】  http://www4.skycn.com/soft/25287.html
【软件简介】  WinUtilities是一套Windows优化工具。
【调试环境】  Windows XP+SP2、PEiD、Ollydbg
【作者声明】  只是感兴趣，没有其他目的。失误之处敬请诸位大侠赐教！

春节要到了，祝坛子里的兄弟姐妹们新春愉快，学习进步，工作顺利！

【算法总结】

1、注册码形式为****-****-****-****-****共五部分组成，分别记为sn1、sn2、sn3、sn4、sn5
2、格式化读入字符串"1-3-1-4"，用于验证比较
3、令m=10，则d=sn5%m，m=d+1
4、d=sn1%m与1比较、d=sn2%m与3比较、d=sn3%m与1比较、d=sn4%m与4比较
全部相等则注册码有效。

【破解过程】

PEiD查壳为 Microsoft Visual C++ 6.0 无壳我喜欢^_^

运行程序输入注册信息
License Name:koala
license Code:12345678-12345678-12345678-12345678-12345678
确定，提示“To verify the license information,Please restart the program.”
还生成注册文件\UserData\User.lcs

OD载入程序，搜索-->所有参考文本串，看看有什么可用信息，发现如下内容，OK就在这设断点了，F9运行，程序被断下

文本字符串参考位于 WO:.text，项目 92
地址=0040471F
反汇编=push WO.0041744C
文本字符串=ASCII "\UserData\User.lcs"

0040471F |> \68 4C744100    push WO.0041744C                            ;  ASCII "\UserData\User.lcs"
00404724 |.  8D4C24 24    lea ecx,dword ptr ss:[esp+24]
00404728 |.  53             push ebx
00404729 |.  51             push ecx
0040472A |.  E8 C1280000    call WO.00406FF0
0040472F |.  83C4 08       add esp,8
00404732 |.  8D5424 28    lea edx,dword ptr ss:[esp+28]                ; |
00404736 |.  50             push eax                                     ; |Arg2
00404737 |.  52             push edx                                     ; |Arg1
00404738 |.  E8 F3160000    call WO.00405E30                            ; \WO.00405E30
0040473D |.  8BC8          mov ecx,eax
0040473F |.  E8 5C0E0000    call WO.004055A0
00404744 |.  51             push ecx
00404745 |.  8BF0          mov esi,eax                                  ;  "D:\Program Files\WinUtilities\UserData\User.lcs"
00404747 |.  896424 20    mov dword ptr ss:[esp+20],esp
0040474B |.  8BFC          mov edi,esp
0040474D |.  6A 0C          push 0C
0040474F |.  E8 257A0000    call WO.0040C179
00404754 |.  83C4 04       add esp,4
00404757 |.  3BC3          cmp eax,ebx
00404759 |.  74 0A          je short WO.00404765
0040475B |.  56             push esi
0040475C |.  8BC8          mov ecx,eax
0040475E |.  E8 3D6E0000    call WO.0040B5A0
00404763 |.  EB 02          jmp short WO.00404767
00404765 |>  33C0          xor eax,eax
00404767 |>  3BC3          cmp eax,ebx
00404769 |.  8907          mov dword ptr ds:[edi],eax
0040476B |.  75 0A          jnz short WO.00404777
0040476D |.  68 0E000780    push 8007000E
00404772 |.  E8 2B730000    call WO.0040BAA2
00404777 |>  B9 48A44100    mov ecx,WO.0041A448
0040477C |.  E8 1F0E0000    call WO.004055A0
00404781 |.  8BC8          mov ecx,eax
00404783 |.  E8 586E0000    call WO.0040B5E0
00404788 |.  8B15 44704100 mov edx,dword ptr ds:[417044]                ;  WO.00417048
0040478E |.  8B4424 24    mov eax,dword ptr ss:[esp+24]                ;  "D:\Program Files\WinUtilities\UserData\User.lcs"
00404792 |.  8D48 F4       lea ecx,dword ptr ds:[eax-C]
00404795 |.  3BCA          cmp ecx,edx
00404797 |.  74 1A          je short WO.004047B3
00404799 |.  83C0 F4       add eax,-0C
0040479C |.  50             push eax
0040479D |.  FFD5          call ebp                                     ;  KERNEL32.InterlockedDecrement
0040479F |.  85C0          test eax,eax
004047A1 |.  7F 10          jg short WO.004047B3
004047A3 |.  8B5424 24    mov edx,dword ptr ss:[esp+24]
004047A7 |.  83C2 F4       add edx,-0C
004047AA |.  52             push edx
004047AB |.  E8 24720000    call WO.0040B9D4
004047B0 |.  83C4 04       add esp,4
004047B3 |>  8B4424 20    mov eax,dword ptr ss:[esp+20]
004047B7 |.  8B15 44704100 mov edx,dword ptr ds:[417044]                ;  WO.00417048
004047BD |.  8D48 F4       lea ecx,dword ptr ds:[eax-C]
004047C0 |.  3BCA          cmp ecx,edx
004047C2 |.  74 1A          je short WO.004047DE
004047C4 |.  83C0 F4       add eax,-0C
004047C7 |.  50             push eax
004047C8 |.  FFD5          call ebp                                     ;  KERNEL32.InterlockedDecrement
004047CA |.  85C0          test eax,eax
004047CC |.  7F 10          jg short WO.004047DE
004047CE |.  8B5424 20    mov edx,dword ptr ss:[esp+20]
004047D2 |.  83C2 F4       add edx,-0C
004047D5 |.  52             push edx
004047D6 |.  E8 F9710000    call WO.0040B9D4
004047DB |.  83C4 04       add esp,4
004047DE |>  68 60EA0000    push 0EA60
004047E3 |.  51             push ecx
004047E4 |.  8BCC          mov ecx,esp
004047E6 |.  896424 2C    mov dword ptr ss:[esp+2C],esp
004047EA |.  68 3C744100    push WO.0041743C                            ;  UNICODE "1-3-1-4"
004047EF |.  E8 BC6C0000    call WO.0040B4B0
004047F4 |.  B9 48A44100    mov ecx,WO.0041A448
004047F9 |.  E8 A20D0000    call WO.004055A0
004047FE |.  8BC8          mov ecx,eax
00404800 |.  E8 AB6E0000    call WO.0040B6B0                            ;  算法验证，跟进
00404805 |.  53             push ebx                                     ; /lParam
00404806 |.  53             push ebx                                     ; |wParam
00404807 |.  53             push ebx                                     ; |Message
00404808 |.  53             push ebx                                     ; |hWnd
00404809 |.  FF15 D0414100 call dword ptr ds:[<&USER32.DefWindowProcA>]  ; \DefWindowProcA
0040480F |.  8D4424 24    lea eax,dword ptr ss:[esp+24]
00404813 |.  50             push eax                                     ; /pInitEx
00404814 |.  C74424 28 08000>mov dword ptr ss:[esp+28],8                ; |
0040481C |.  C74424 2C 04040>mov dword ptr ss:[esp+2C],404                ; |
00404824 |.  FF15 08404100 call dword ptr ds:[<&COMCTL32.InitCommonContr>; \InitCommonControlsEx
......

===========  跟进 00404800 call WO.0040B6B0  ====================

0040B6B0 /$  64:A1 00000000  mov eax,dword ptr fs:[0]
0040B6B6 |.  6A FF          push -1
0040B6B8 |.  68 78384100    push WO.00413878
0040B6BD |.  50             push eax
0040B6BE |.  64:8925 0000000>mov dword ptr fs:[0],esp
0040B6C5 |.  53             push ebx
0040B6C6 |.  56             push esi
0040B6C7 |.  57             push edi
0040B6C8 |.  8BF1          mov esi,ecx
0040B6CA |.  8B7C24 1C    mov edi,dword ptr ss:[esp+1C]
0040B6CE |.  C74424 14 00000>mov dword ptr ss:[esp+14],0
0040B6D6 |.  85FF          test edi,edi
0040B6D8 |.  74 04          je short WO.0040B6DE
0040B6DA |.  8B07          mov eax,dword ptr ds:[edi]                   ;  UNICODE "1-3-1-4"
0040B6DC |.  EB 02          jmp short WO.0040B6E0
0040B6DE |>  33C0          xor eax,eax
0040B6E0 |>  8B5424 20    mov edx,dword ptr ss:[esp+20]
0040B6E4 |.  8B0E          mov ecx,dword ptr ds:[esi]
0040B6E6 |.  52             push edx
0040B6E7 |.  50             push eax
0040B6E8 |.  56             push esi
0040B6E9 |.  FF51 38       call dword ptr ds:[ecx+38]                   ;  算法验证，跟进
0040B6EC |.  8BD8          mov ebx,eax
0040B6EE |.  85DB          test ebx,ebx
0040B6F0 |.  7D 0C          jge short WO.0040B6FE
0040B6F2 |.  68 58714100    push WO.00417158
0040B6F7 |.  56             push esi
0040B6F8 |.  53             push ebx
0040B6F9 |.  E8 B2030000    call WO.0040BAB0
0040B6FE |>  85FF          test edi,edi
0040B700 |.  74 34          je short WO.0040B736
0040B702 |.  8D47 08       lea eax,dword ptr ds:[edi+8]
0040B705 |.  50             push eax                                     ; /pVar
0040B706 |.  FF15 4C414100 call dword ptr ds:[<&KERNEL32.InterlockedDecr>; \InterlockedDecrement
......

===========  跟进 0040B6E9  call dword ptr ds:[ecx+38]  ==============

01653C11    B8 68A26601    mov eax,ComLicen.0166A268
01653C16    E8 59F30000    call ComLicen.01662F74
01653C1B    83EC 10          sub esp,10
01653C1E    56             push esi
01653C1F    8D4D 0C          lea ecx,dword ptr ss:[ebp+C]
01653C22    FF75 0C          push dword ptr ss:[ebp+C]
01653C25    E8 1FC70000    call ComLicen.01660349
01653C2A    8B45 0C          mov eax,dword ptr ss:[ebp+C]                ; ASCII "1-3-1-4"
01653C2D    8D4D F0          lea ecx,dword ptr ss:[ebp-10]
01653C30    51             push ecx
01653C31    8D4D EC          lea ecx,dword ptr ss:[ebp-14]
01653C34    51             push ecx
01653C35    33F6             xor esi,esi
01653C37    8D4D E8          lea ecx,dword ptr ss:[ebp-18]
01653C3A    8975 E4          mov dword ptr ss:[ebp-1C],esi
01653C3D    8975 E8          mov dword ptr ss:[ebp-18],esi
01653C40    8975 EC          mov dword ptr ss:[ebp-14],esi
01653C43    8975 F0          mov dword ptr ss:[ebp-10],esi
01653C46    8B40 F8          mov eax,dword ptr ds:[eax-8]
01653C49    51             push ecx
01653C4A    8D4D E4          lea ecx,dword ptr ss:[ebp-1C]
01653C4D    51             push ecx
01653C4E    40             inc eax
01653C4F    68 34E36601    push ComLicen.0166E334                      ; ASCII "%ld-%ld-%ld-%ld"
01653C54    50             push eax
01653C55    8D4D 0C          lea ecx,dword ptr ss:[ebp+C]
01653C58    8975 FC          mov dword ptr ss:[ebp-4],esi
01653C5B    E8 51C80000    call ComLicen.016604B1
01653C60    50             push eax
01653C61    E8 23FD0000    call ComLicen.01663989                      ; 格式化读入，用于验证比较
01653C66    83C4 18          add esp,18
01653C69    83F8 04          cmp eax,4
01653C6C    75 1A          jnz short ComLicen.01653C88
01653C6E    FF75 10          push dword ptr ss:[ebp+10]
01653C71    8B45 08          mov eax,dword ptr ss:[ebp+8]
01653C74    FF75 F0          push dword ptr ss:[ebp-10]
01653C77    8B08             mov ecx,dword ptr ds:[eax]
01653C79    FF75 EC          push dword ptr ss:[ebp-14]
01653C7C    FF75 E8          push dword ptr ss:[ebp-18]
01653C7F    FF75 E4          push dword ptr ss:[ebp-1C]
01653C82    50             push eax
01653C83    FF51 30          call dword ptr ds:[ecx+30]                   ; 算法验证，跟进
01653C86    8BF0             mov esi,eax
01653C88    8D4D 0C          lea ecx,dword ptr ss:[ebp+C]
01653C8B    E8 F2EEFFFF    call ComLicen.01652B82
01653C90    8B4D F4          mov ecx,dword ptr ss:[ebp-C]
01653C93    8BC6             mov eax,esi
01653C95    5E             pop esi
01653C96    64:890D 00000000  mov dword ptr fs:[0],ecx
01653C9D    C9             leave
01653C9E    C2 0C00          retn 0C

===========  跟进  01653C83  call dword ptr ds:[ecx+30] ==========

01653D1D    50             push eax                                     ; ASCII "D:\Program Files\WinUtilities\UserData\User.lcs"
01653D1E    8D46 14          lea eax,dword ptr ds:[esi+14]
01653D21    68 FF000000    push 0FF
01653D26    50             push eax
01653D27    68 28126701    push ComLicen.01671228
01653D2C    68 68E36601    push ComLicen.0166E368                      ; ASCII "Name"
01653D31    68 60E36601    push ComLicen.0166E360                      ; ASCII "License"
01653D36    FF15 90B06601    call dword ptr ds:[<&KERNEL32.GetPrivateProfi>; KERNEL32.GetPrivateProfileStringA
01653D3C    FF76 10          push dword ptr ds:[esi+10]
01653D3F    8D86 13010000    lea eax,dword ptr ds:[esi+113]
01653D45    68 FF000000    push 0FF
01653D4A    50             push eax
01653D4B    68 28126701    push ComLicen.01671228
01653D50    68 58E36601    push ComLicen.0166E358                      ; ASCII "Code"
01653D55    68 60E36601    push ComLicen.0166E360                      ; ASCII "License"
01653D5A    FF15 90B06601    call dword ptr ds:[<&KERNEL32.GetPrivateProfi>; KERNEL32.GetPrivateProfileStringA
01653D60    FF15 A4B26601    call dword ptr ds:[<&WINMM.timeGetTime>]    ; WINMM.timeGetTime
01653D66    6A 0A          push 0A
01653D68    33D2             xor edx,edx
01653D6A    59             pop ecx
01653D6B    F7F1             div ecx
01653D6D    83FA 09          cmp edx,9
01653D70    0F87 8B4E0000    ja ComLicen.01658C01
01653D76    FF2495 11946501 jmp dword ptr ds:[edx*4+1659411]
01653D7D    33C0             xor eax,eax
01653D7F    8D4D 08          lea ecx,dword ptr ss:[ebp+8]
01653D82    50             push eax
01653D83    50             push eax
01653D84    50             push eax
01653D85    50             push eax
01653D86    51             push ecx
01653D87    50             push eax
01653D88    50             push eax
01653D89    68 54E36601    push ComLicen.0166E354                      ; ASCII "c:\"
01653D8E    8945 08          mov dword ptr ss:[ebp+8],eax
01653D91    FF15 8CB06601    call dword ptr ds:[<&KERNEL32.GetVolumeInform>; KERNEL32.GetVolumeInformationA
01653D97    8B45 08          mov eax,dword ptr ss:[ebp+8]
01653D9A    6A 0A          push 0A
01653D9C    33D2             xor edx,edx
01653D9E    59             pop ecx
01653D9F    F7F1             div ecx
01653DA1    83FA 09          cmp edx,9
01653DA4    0F87 FB060000    ja ComLicen.016544A5
01653DAA    FF2495 39946501 jmp dword ptr ds:[edx*4+1659439]
01653D7D    33C0             xor eax,eax
01653D7F    8D4D 08          lea ecx,dword ptr ss:[ebp+8]
01653D82    50             push eax
01653D83    50             push eax
01653D84    50             push eax
01653D85    50             push eax
01653D86    51             push ecx
01653D87    50             push eax
01653D88    50             push eax
01653D89    68 54E36601    push ComLicen.0166E354                      ; ASCII "c:\"
01653D8E    8945 08          mov dword ptr ss:[ebp+8],eax
01653D91    FF15 8CB06601    call dword ptr ds:[<&KERNEL32.GetVolumeInform>; KERNEL32.GetVolumeInformationA
01653D97    8B45 08          mov eax,dword ptr ss:[ebp+8]
01653D9A    6A 0A          push 0A
01653D9C    33D2             xor edx,edx
01653D9E    59             pop ecx
01653D9F    F7F1             div ecx
01653DA1    83FA 09          cmp edx,9
01653DA4    0F87 FB060000    ja ComLicen.016544A5
01653DAA    FF2495 39946501 jmp dword ptr ds:[edx*4+1659439]
......
01656E31    8D46 14          lea eax,dword ptr ds:[esi+14]                ; 取用户名
01656E34    57             push edi
01656E35    50             push eax
01656E36    8D85 E8FDFFFF    lea eax,dword ptr ss:[ebp-218]
01656E3C    50             push eax
01656E3D    E8 FEC50000    call ComLicen.01663440
01656E42    6A 14          push 14
01656E44    8D45 EC          lea eax,dword ptr ss:[ebp-14]
01656E47    6A 00          push 0
01656E49    50             push eax
01656E4A    E8 41C90000    call ComLicen.01663790
01656E4F    83C4 18          add esp,18
01656E52    8D45 FC          lea eax,dword ptr ss:[ebp-4]
01656E55    50             push eax
01656E56    8D45 F8          lea eax,dword ptr ss:[ebp-8]
01656E59    50             push eax
01656E5A    8D45 F4          lea eax,dword ptr ss:[ebp-C]
01656E5D    50             push eax
01656E5E    8D45 F0          lea eax,dword ptr ss:[ebp-10]
01656E61    50             push eax
01656E62    8D45 EC          lea eax,dword ptr ss:[ebp-14]
01656E65    50             push eax
01656E66    8D85 E7FEFFFF    lea eax,dword ptr ss:[ebp-119]             ; 取注册码
01656E6C    68 44E36601    push ComLicen.0166E344                      ; ASCII "%x-%x-%x-%x-%x"
01656E71    50             push eax
01656E72    E8 12CB0000    call ComLicen.01663989                      ; 格式化读入注册码
01656E77    8BF8             mov edi,eax
01656E79    8D85 E8FDFFFF    lea eax,dword ptr ss:[ebp-218]
01656E7F    50             push eax
01656E80    E8 3BCB0000    call ComLicen.016639C0
01656E85    83C4 20          add esp,20
01656E88    85C0             test eax,eax                               ; 用户名是否为空
01656E8A    0F86 4A250000    jbe ComLicen.016593DA
01656E90    83FF 05          cmp edi,5                                  ; 注册码是否为5部分组成
01656E93    0F85 41250000    jnz ComLicen.016593DA
01656E99    8B45 FC          mov eax,dword ptr ss:[ebp-4]                ; 取第5部分
01656E9C    6A 0A          push 0A
01656E9E    33D2             xor edx,edx
01656EA0    59             pop ecx
01656EA1    F7F1             div ecx
01656EA3    8B45 EC          mov eax,dword ptr ss:[ebp-14]                ; 取第1部分
01656EA6    8D4A 01          lea ecx,dword ptr ds:[edx+1]                ; ecx=edx+1
01656EA9    33D2             xor edx,edx
01656EAB    F7F1             div ecx
01656EAD    3B13             cmp edx,dword ptr ds:[ebx]                   ; 与1比较
01656EAF    0F85 25250000    jnz ComLicen.016593DA                      ; 不跳
01656EB5    8B45 F0          mov eax,dword ptr ss:[ebp-10]                ; 取第2部分
01656EB8    33D2             xor edx,edx
01656EBA    F7F1             div ecx
01656EBC    3B96 1C020000    cmp edx,dword ptr ds:[esi+21C]             ; 与3比较
01656EC2    0F85 12250000    jnz ComLicen.016593DA                      ; 不跳
01656EC8    8B45 F4          mov eax,dword ptr ss:[ebp-C]                ; 取第3部分
01656ECB    33D2             xor edx,edx
01656ECD    F7F1             div ecx
01656ECF    3B96 20020000    cmp edx,dword ptr ds:[esi+220]             ; 与1比较
01656ED5    0F85 FF240000    jnz ComLicen.016593DA                      ; 不跳
01656EDB    8B45 F8          mov eax,dword ptr ss:[ebp-8]                ; 取第4部分
01656EDE    E9 DF240000    jmp ComLicen.016593C2
......
016593C2    33D2             xor edx,edx
016593C4    F7F1             div ecx
016593C6    3B96 24020000    cmp edx,dword ptr ds:[esi+224]             ; 与4比较
016593CC    75 0C          jnz short ComLicen.016593DA                ; 不跳
016593CE    C786 14020000 010>mov dword ptr ds:[esi+214],1                ; 验证标志
016593D8    EB 07          jmp short ComLicen.016593E1
......

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