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【文章标题】: URLegal v3.3
【文章作者】: 森林阴霾
【作者邮箱】: 496624130@qq.com
【软件大小】: 152KB
【下载地址】: 链接：http://pan.baidu.com/s/1gdBo9f9 密码：y111
【保护方式】: 注册码
【使用工具】: PEiD OllyDbg
【操作平台】: XP-SP2
【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!
因为天草教学中，三人行大大经常说“大家自己跟下CALL，分析下密码。”有朋友问我，就顺便写篇教程吧。让大家知道一下分析的大概思路，这里是最简单的明码比较哦。
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【教程内容】
OD打开软件，首先搜索关键字“Name / Code mis-match.Try again.”双击进去，找到断首F2下断，停在当前下面代码上。
004025C6 /. 55 push ebp
004025C7 |. 8BEC mov ebp,esp
004025C9 |. 6A FF push -1
004025CB |. 68 AA754100 push Urlegal.004175AA ; SE 句柄安装
004025D0 |. 64:A1 00000000 mov eax,dword ptr fs:[0]
004025D6 |. 50 push eax
004025D7 |. 64:8925 000000>mov dword ptr fs:[0],esp
004025DE |. 81EC 80000000 sub esp,80
004025E4 |. 898D 7CFFFFFF mov dword ptr ss:[ebp-84],ecx
004025EA |. 6A 00 push 0 ; /Arg1 = 00000000
004025EC |. 8D4D 8C lea ecx,dword ptr ss:[ebp-74] ; |
004025EF |. E8 8C120000 call Urlegal.00403880 ; \Urlegal.00403880
004025F4 |. C745 FC 000000>mov dword ptr ss:[ebp-4],0
004025FB |. 8D4D 8C lea ecx,dword ptr ss:[ebp-74]
004025FE |. E8 09430100 call <jmp.&MFC42.#2514> ; 调用输入窗口
00402603 |. 83F8 01 cmp eax,1
00402606 |. 0F85 D5000000 jnz Urlegal.004026E1
0040260C |. E8 7FEEFFFF call Urlegal.00401490
00402611 |. 8945 84 mov dword ptr ss:[ebp-7C],eax
00402614 |. 51 push ecx
00402615 |. 8BCC mov ecx,esp
00402617 |. 8965 80 mov dword ptr ss:[ebp-80],esp
0040261A |. 8D45 F0 lea eax,dword ptr ss:[ebp-10]
0040261D |. 50 push eax
0040261E |. E8 71450100 call <jmp.&MFC42.#535>
00402623 |. 8985 78FFFFFF mov dword ptr ss:[ebp-88],eax ; |
00402629 |. 8D4D 88 lea ecx,dword ptr ss:[ebp-78] ; |
0040262C |. 51 push ecx ; |Arg1
0040262D |. 8B4D 84 mov ecx,dword ptr ss:[ebp-7C] ; |
00402630 |. 81C1 D0000000 add ecx,0D0 ; |
00402636 |. E8 AE310000 call Urlegal.004057E9 ; \提用户名
0040263B |. 8985 74FFFFFF mov dword ptr ss:[ebp-8C],eax ; 堆栈出现真码
00402641 |. C645 FC 01 mov byte ptr ss:[ebp-4],1
00402645 |. 8D4D 88 lea ecx,dword ptr ss:[ebp-78]
00402648 |. E8 C3050000 call Urlegal.00402C10
0040264D |. 85C0 test eax,eax
0040264F |. 75 76 jnz short Urlegal.004026C7
00402651 |. 8D55 EC lea edx,dword ptr ss:[ebp-14]
00402654 |. 52 push edx ; /Arg2
00402655 |. 8D45 88 lea eax,dword ptr ss:[ebp-78] ; |
00402658 |. 50 push eax ; |Arg1
00402659 |. E8 02060000 call Urlegal.00402C60 ; \关键call
0040265E |. 25 FF000000 and eax,0FF
00402663 |. 85C0 test eax,eax
00402665 |. 74 60 je short Urlegal.004026C7 ; 关键跳
00402667 |. 8D4D F0 lea ecx,dword ptr ss:[ebp-10]
0040266A |. E8 E1050000 call Urlegal.00402C50
0040266F |. 50 push eax ; /Arg3
00402670 |. 68 04E24100 push Urlegal.0041E204 ; |name
00402675 |. 68 0CE24100 push Urlegal.0041E20C ; |user
0040267A |. 8B4D 84 mov ecx,dword ptr ss:[ebp-7C] ; |
0040267D |. 81C1 C4000000 add ecx,0C4 ; |
00402683 |. E8 AD450000 call Urlegal.00406C35 ; \Urlegal.00406C35
00402688 |. 8D4D EC lea ecx,dword ptr ss:[ebp-14]
0040268B |. E8 C0050000 call Urlegal.00402C50
00402690 |. 50 push eax ; /Arg3
00402691 |. 68 14E24100 push Urlegal.0041E214 ; |code
00402696 |. 68 1CE24100 push Urlegal.0041E21C ; |user
0040269B |. 8B4D 84 mov ecx,dword ptr ss:[ebp-7C] ; |
0040269E |. 81C1 C4000000 add ecx,0C4 ; |
004026A4 |. E8 8C450000 call Urlegal.00406C35 ; \Urlegal.00406C35
004026A9 |. 8B4D 84 mov ecx,dword ptr ss:[ebp-7C]
004026AC |. 81C1 D0000000 add ecx,0D0
004026B2 |. E8 72170000 call Urlegal.00403E29
004026B7 |. 6A 00 push 0
004026B9 |. 6A 00 push 0
004026BB |. 68 24E24100 push Urlegal.0041E224 ; thank you for registering!
004026C0 |. E8 B1440100 call <jmp.&MFC42.#1200>
004026C5 |. EB 0E jmp short Urlegal.004026D5
004026C7 |> 6A 00 push 0
004026C9 |. 6A 00 push 0
004026CB |. 68 40E24100 push Urlegal.0041E240 ; name / code mis-match. try again.
004026D0 |. E8 A1440100 call <jmp.&MFC42.#1200>
004026D5 |> C645 FC 00 mov byte ptr ss:[ebp-4],0
004026D9 |. 8D4D 88 lea ecx,dword ptr ss:[ebp-78]
004026DC |. E8 DF420100 call <jmp.&MFC42.#800>
004026E1 |> C745 FC FFFFFF>mov dword ptr ss:[ebp-4],-1
004026E8 |. 8D4D 8C lea ecx,dword ptr ss:[ebp-74]
004026EB |. E8 C0040000 call Urlegal.00402BB0
004026F0 |. 8B4D F4 mov ecx,dword ptr ss:[ebp-C]
004026F3 |. 64:890D 000000>mov dword ptr fs:[0],ecx
004026FA |. 8BE5 mov esp,ebp
004026FC |. 5D pop ebp
004026FD \. C3 retn
------------------------------------------------------------------------------------------------------
00402659 |. E8 02060000 call Urlegal.00402C60 ; \关键call
进去后
00402C60 /$ 55 push ebp
00402C61 |. 8BEC mov ebp,esp
00402C63 |. 8B4D 0C mov ecx,dword ptr ss:[ebp+C]
00402C66 |. E8 E5FFFFFF call Urlegal.00402C50 ; 提假码
00402C6B |. 50 push eax ; /Arg1
00402C6C |. 8B4D 08 mov ecx,dword ptr ss:[ebp+8] ; |
00402C6F |. E8 0C000000 call Urlegal.00402C80 ; \Urlegal.00402C80
00402C74 |. F7D8 neg eax
00402C76 |. 1BC0 sbb eax,eax
00402C78 |. 40 inc eax
00402C79 |. 5D pop ebp
00402C7A \. C2 0800 retn 8
------------------------------------------------------------------------------------------------------
00402C6F |. E8 0C000000 call Urlegal.00402C80 ; \Urlegal.00402C80
进去后
00402C80 /$ 55 push ebp
00402C81 |. 8BEC mov ebp,esp
00402C83 |. 51 push ecx
00402C84 |. 894D FC mov dword ptr ss:[ebp-4],ecx
00402C87 |. 8B45 08 mov eax,dword ptr ss:[ebp+8] ; 将假码放入EAX
00402C8A |. 50 push eax ; /拿出真码
00402C8B |. 8B4D FC mov ecx,dword ptr ss:[ebp-4] ; |
00402C8E |. 8B11 mov edx,dword ptr ds:[ecx] ; |真码放入EDX
00402C90 |. 52 push edx ; |拿出假码
00402C91 |. E8 0A000000 call Urlegal.00402CA0 ; \比较CALL
00402C96 |. 83C4 08 add esp,8
00402C99 |. 8BE5 mov esp,ebp
00402C9B |. 5D pop ebp
00402C9C \. C2 0400 retn 4
------------------------------------------------------------------------------------------------------
00402C91 |. E8 0A000000 call Urlegal.00402CA0 ; \比较CALL
进去后
00402CA0 /$ 55 push ebp
00402CA1 |. 8BEC mov ebp,esp ; 这里不知道为什么,这程序又要提
00402CA3 |. 8B45 0C mov eax,dword ptr ss:[ebp+C] ; 再给一次假码
00402CA6 |. 50 push eax ; /s2
00402CA7 |. 8B4D 08 mov ecx,dword ptr ss:[ebp+8] ; |再提一次真码
00402CAA |. 51 push ecx ; |s1
00402CAB |. FF15 6C964100 call dword ptr ds:[<&MSVCRT._mbscmp>] ; \_mbscmp
00402CB1 |. 83C4 08 add esp,8
00402CB4 |. 5D pop ebp
00402CB5 \. C3 retn
------------------------------------------------------------------------------------------------------
00402CAB |. FF15 6C964100 call dword ptr ds:[<&MSVCRT._mbscmp>] ; \_mbscmp
进去后
77C01881 > 8BFF mov edi,edi
77C01883 55 push ebp
77C01884 8BEC mov ebp,esp
77C01886 56 push esi
77C01887 E8 99860000 call msvcrt.77C09F25
77C0188C 8B70 60 mov esi,dword ptr ds:[eax+60]
77C0188F 3B35 4425C377 cmp esi,dword ptr ds:[77C32544]
77C01895 74 07 je short msvcrt.77C0189E
77C01897 E8 91EDFFFF call msvcrt.77C0062D
77C0189C 8BF0 mov esi,eax
77C0189E 837E 08 00 cmp dword ptr ds:[esi+8],0
77C018A2 75 2F jnz short msvcrt.77C018D3
77C018A4 8B75 0C mov esi,dword ptr ss:[ebp+C]
77C018A7 8B45 08 mov eax,dword ptr ss:[ebp+8]
77C018AA 8A10 mov dl,byte ptr ds:[eax]
77C018AC 8ACA mov cl,dl
77C018AE 3A16 cmp dl,byte ptr ds:[esi]
77C018B0 75 1A jnz short msvcrt.77C018CC
77C018B2 84C9 test cl,cl
77C018B4 74 12 je short msvcrt.77C018C8
77C018B6 8A50 01 mov dl,byte ptr ds:[eax+1]
77C018B9 8ACA mov cl,dl
77C018BB 3A56 01 cmp dl,byte ptr ds:[esi+1]
77C018BE 75 0C jnz short msvcrt.77C018CC
77C018C0 40 inc eax
77C018C1 40 inc eax
77C018C2 46 inc esi
77C018C3 46 inc esi
77C018C4 84C9 test cl,cl
77C018C6 ^ 75 E2 jnz short msvcrt.77C018AA
77C018C8 33C0 xor eax,eax
77C018CA EB 68 jmp short msvcrt.77C01934
77C018CC 1BC0 sbb eax,eax
77C018CE 83D8 FF sbb eax,-1
77C018D1 EB 61 jmp short msvcrt.77C01934
77C018D3 57 push edi
77C018D4 8B7D 0C mov edi,dword ptr ss:[ebp+C] ; 假码给EDI
77C018D7 53 push ebx
77C018D8 8B45 08 mov eax,dword ptr ss:[ebp+8] ; 真码给EAX
77C018DB 66:0FB600 movzx ax,byte ptr ds:[eax] ; 取真码第一位AX(经过循环后一直给到32位)
77C018DF FF45 08 inc dword ptr ss:[ebp+8]
77C018E2 0FB6C8 movzx ecx,al ; 真码第一位给ECX(经过循环后一直给到32位)
77C018E5 F64431 1D 04 test byte ptr ds:[ecx+esi+1D],4
77C018EA 74 18 je short msvcrt.77C01904
77C018EC 8B4D 08 mov ecx,dword ptr ss:[ebp+8]
77C018EF 8A09 mov cl,byte ptr ds:[ecx]
77C018F1 84C9 test cl,cl
77C018F3 75 04 jnz short msvcrt.77C018F9
77C018F5 33C0 xor eax,eax
77C018F7 EB 0B jmp short msvcrt.77C01904
77C018F9 33D2 xor edx,edx
77C018FB FF45 08 inc dword ptr ss:[ebp+8]
77C018FE 8AF0 mov dh,al
77C01900 8AD1 mov dl,cl
77C01902 8BC2 mov eax,edx
77C01904 66:0FB60F movzx cx,byte ptr ds:[edi] ; 假码第一位给cx(经过循环后一直给到32位)
77C01908 0FB6D1 movzx edx,cl ; 假码第一位给EDX(经过循环后一直给到32位)
77C0190B 47 inc edi
77C0190C F64432 1D 04 test byte ptr ds:[edx+esi+1D],4
77C01911 74 13 je short msvcrt.77C01926
77C01913 8A17 mov dl,byte ptr ds:[edi]
77C01915 84D2 test dl,dl
77C01917 75 04 jnz short msvcrt.77C0191D
77C01919 33C9 xor ecx,ecx
77C0191B EB 09 jmp short msvcrt.77C01926
77C0191D 33DB xor ebx,ebx
77C0191F 8AF9 mov bh,cl
77C01921 47 inc edi
77C01922 8ADA mov bl,dl
77C01924 8BCB mov ecx,ebx
77C01926 66:3BC8 cmp cx,ax ; 比较真码与假码第一位(经过循环后一直比较到32位)
77C01929 75 0C jnz short msvcrt.77C01937 ; 不对就下出去
77C0192B 66:85C0 test ax,ax
77C0192E ^ 75 A8 jnz short msvcrt.77C018D8 ; 循环比较1-32位真假码
77C01930 33C0 xor eax,eax ; 关键赋值语句
77C01932 5B pop ebx
77C01933 5F pop edi
77C01934 5E pop esi
77C01935 5D pop ebp
77C01936 C3 retn
最重要的是最后的循环，这个循环保证能将32位真码和假码比较完，然后最重要的“xor eax,eax”赋值语句能加上。
最后注册码大家应该知道怎么找了吧？
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发表于 2014-3-19 22:13
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发表于 2014-3-19 22:22
