因工作需要，在网上找了一款可以在屏幕上画画的软件，屏幕画笔，打开一看竟然是共享软件，没办法，抄家伙了~.....
(程序有壳，先脱壳....)
该程序是重启验证，所以很快就定位到了关键点~
代码如下
//////////////////////////////////////////
004CB8FC /. 55 push ebp
004CB8FD |. 8BEC mov ebp, esp
004CB8FF |. 33C9 xor ecx, ecx
004CB901 |. 51 push ecx
004CB902 |. 51 push ecx
004CB903 |. 51 push ecx
004CB904 |. 51 push ecx
004CB905 |. 51 push ecx
004CB906 |. 51 push ecx
004CB907 |. 53 push ebx
004CB908 |. 56 push esi
004CB909 |. 8BF0 mov esi, eax
004CB90B |. 33C0 xor eax, eax
004CB90D |. 55 push ebp
004CB90E |. 68 3DBA4C00 push 004CBA3D
004CB913 |. 64:FF30 push dword ptr fs:[eax]
004CB916 |. 64:8920 mov dword ptr fs:[eax], esp
004CB919 |. B8 C8214D00 mov eax, 004D21C8
004CB91E |. E8 498AF3FF call 0040436C
004CB923 |. 8D45 FC lea eax, dword ptr [ebp-4]
004CB926 |. E8 89F9FFFF call 004CB2B4
004CB92B |. 8B55 FC mov edx, dword ptr [ebp-4]
004CB92E |. B8 C8214D00 mov eax, 004D21C8
004CB933 |. E8 888AF3FF call 004043C0
004CB938 |. 8D45 F8 lea eax, dword ptr [ebp-8]
004CB93B |. E8 28FAFFFF call 004CB368
004CB940 |. 8B55 F8 mov edx, dword ptr [ebp-8]
004CB943 |. B8 BC214D00 mov eax, 004D21BC
004CB948 |. E8 738AF3FF call 004043C0
004CB94D |. 8D45 F4 lea eax, dword ptr [ebp-C]
004CB950 |. E8 53FBFFFF call 004CB4A8
004CB955 |. 8B55 F4 mov edx, dword ptr [ebp-C]
004CB958 |. B8 C0214D00 mov eax, 004D21C0
004CB95D |. E8 5E8AF3FF call 004043C0
004CB962 |. E8 D1F3FFFF call 004CAD38
004CB967 |. A1 BC214D00 mov eax, dword ptr [4D21BC]
004CB96C |. BA 54BA4C00 mov edx, 004CBA54 ; 220.220.220.1
004CB971 |. E8 F28DF3FF call 00404768
004CB976 |. 75 0F jnz short 004CB987
004CB978 |. E8 BFFDFFFF call 004CB73C
004CB97D |. E8 52F7FFFF call 004CB0D4
004CB982 |. E8 69F6FFFF call 004CAFF0
004CB987 |> C605 B4214D00>mov byte ptr [4D21B4], 0
004CB98E |. B2 01 mov dl, 1
004CB990 |. A1 087E4600 mov eax, dword ptr [467E08]
004CB995 |. E8 6EC5F9FF call 00467F08
004CB99A |. 8BD8 mov ebx, eax
004CB99C |. BA 01000080 mov edx, 80000001
004CB9A1 |. 8BC3 mov eax, ebx
004CB9A3 |. E8 00C6F9FF call 00467FA8
004CB9A8 |. B1 01 mov cl, 1
004CB9AA |. BA 6CBA4C00 mov edx, 004CBA6C ; software\epen
004CB9AF |. 8BC3 mov eax, ebx
004CB9B1 |. E8 56C6F9FF call 0046800C
004CB9B6 |. 8D4D F0 lea ecx, dword ptr [ebp-10]
004CB9B9 |. BA 84BA4C00 mov edx, 004CBA84 ; reguser
004CB9BE |. 8BC3 mov eax, ebx
004CB9C0 |. E8 0FC8F9FF call 004681D4
004CB9C5 |. 8B55 F0 mov edx, dword ptr [ebp-10]
004CB9C8 |. B8 B8214D00 mov eax, 004D21B8
004CB9CD |. E8 EE89F3FF call 004043C0
004CB9D2 |. 8D4D EC lea ecx, dword ptr [ebp-14]
004CB9D5 |. BA 94BA4C00 mov edx, 004CBA94 ; regno
004CB9DA |. 8BC3 mov eax, ebx
004CB9DC |. E8 F3C7F9FF call 004681D4
004CB9E1 |. 8B45 EC mov eax, dword ptr [ebp-14]
004CB9E4 |. 50 push eax
004CB9E5 |. 8D4D E8 lea ecx, dword ptr [ebp-18]
004CB9E8 |. BA A4BA4C00 mov edx, 004CBAA4 ; epenchina
004CB9ED |. A1 B8214D00 mov eax, dword ptr [4D21B8]
004CB9F2 |. E8 8DD6FFFF call 004C9084 ; 算法
004CB9F7 |. 8B55 E8 mov edx, dword ptr [ebp-18] ; 运行到这里的时候,出现了注册码
004CB9FA |. 58 pop eax ; (initial cpu selection)
004CB9FB |. E8 688DF3FF call 00404768
004CBA00 |. 75 07 jnz short 004CBA09 ; 关键跳
004CBA02 |. C605 B4214D00>mov byte ptr [4D21B4], 1 ; 全局注册标志
004CBA09 |> 8BC3 mov eax, ebx
004CBA0B |. E8 D07BF3FF call 004035E0
004CBA10 |. B2 02 mov dl, 2
004CBA12 |. 8BC6 mov eax, esi
004CBA14 |. E8 F7F9F8FF call 0045B410
004CBA19 |. 33D2 xor edx, edx
004CBA1B |. 8BC6 mov eax, esi
004CBA1D |. E8 76F2F8FF call 0045AC98
004CBA22 |. 33C0 xor eax, eax
004CBA24 |. 5A pop edx
004CBA25 |. 59 pop ecx
004CBA26 |. 59 pop ecx
004CBA27 |. 64:8910 mov dword ptr fs:[eax], edx
004CBA2A |. 68 44BA4C00 push 004CBA44
004CBA2F |> 8D45 E8 lea eax, dword ptr [ebp-18]
004CBA32 |. BA 06000000 mov edx, 6
004CBA37 |. E8 5489F3FF call 00404390
004CBA3C \. C3 retn
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