某制图软件域天加密狗破解过程

某制图软件域天加密狗破解过程

某制图软件域天加密狗破解过程

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来源: 发布时间: 2011-9-20 22:08:30 浏览: 7

这是一个商业软件，具体名称就不写出来了，主要用于企事业单位的网络图形化设计，在没有加密狗的情况下软件有功能限制，一个工程最多只能保存800个节点，再添加节点就无法保存了。对一般的小企业是足够了，如果碰上大的单位，这个限制就使用该软件无法胜任。经过软件跟踪发现，该软件用的是域天加密狗。

用PEID检测，提示为Microsoft Visual Basic 5.0 / 6.0。

用OD加载：

00423C24 > $ 68 883F4200 push VisualNe.00423F88 ; ASCII "VB5!

6&vb6chs.dll"

00423C29 . E8 F0FFFFFF call <jmp.&MSVBVM60.#100>

00423C2E . 0000 add byte ptr ds:[eax],al

00423C30 . 0000 add byte ptr ds:[eax],al

00423C32 . 0000 add byte ptr ds:[eax],al

00423C34 . 3000 xor byte ptr ds:[eax],al

00423C36 . 0000 add byte ptr ds:[eax],al

由于软件只是在节点数达到800的时候才无法保存工程，所以我们只需要找到保存文件的函数：

0103E179 . 66:8985 CCFEF>mov word ptr ss:[ebp-0x134],ax

0103E180 . 8D4D D8 lea ecx,dword ptr ss:[ebp-0x28]

0103E183 . FF15 30144000 call dword ptr ds:[<&MSVBVM60.__vbaFreeS>; MSVBVM60.__vbaFreeStr

0103E189 . 8D4D A8 lea ecx,dword ptr ss:[ebp-0x58]

0103E18C . FF15 2C104000 call dword ptr ds:[<&MSVBVM60.__vbaFreeV>; MSVBVM60.__vbaFreeVar

0103E192 . 0FBF8D CCFEFF>movsx ecx,word ptr ss:[ebp-0x134]

0103E199 . 85C9 test ecx,ecx

0103E19B . 0F84 B7130000 je VisualNe.0103F558 //加密狗破解关键跳转，NOP掉

0103E1A1 . C745 FC 1B000>mov dword ptr ss:[ebp-0x4],0x1B

0103E1A8 . 6A 00 push 0x0

0103E1AA . 6A 01 push 0x1

0103E1AC . 8B95 B4FEFFFF mov edx,dword ptr ss:[ebp-0x14C]

0103E1B2 . 52 push edx

0103E1B3 . 8D45 A8 lea eax,dword ptr ss:[ebp-0x58]

0103E1B6 . 50 push eax

0103E1B7 . FF15 08124000 call dword ptr ds:[<&MSVBVM60.__vbaLateI>;

MSVBVM60.__vbaLateIdCallLd

0103E1BD . 83C4 10 add esp,0x10

0103E1C0 . 50 push eax

0103E1C1 . FF15 3C104000 call dword ptr ds:[<&MSVBVM60.__vbaStrVa>;

MSVBVM60.__vbaStrVarMove

0103E1C7 . 8945 A0 mov dword ptr ss:[ebp-0x60],eax

0103E1CA . C745 98 08000>mov dword ptr ss:[ebp-0x68],0x8

0103E1D1 . 6A 00 push 0x0

0103E1D3 . 8D4D 98 lea ecx,dword ptr ss:[ebp-0x68]

0103E1D6 . 51 push ecx

0103E1D7 . FF15 DC124000 call dword ptr ds:[<&MSVBVM60.#645>] ; MSVBVM60.rtcDir

0103E1DD . 8BD0 mov edx,eax

0103E1DF . 8D4D D8 lea ecx,dword ptr ss:[ebp-0x28]

0103E1E2 . FF15 CC134000 call dword p

tr ds:[<&MSVBVM60.__vbaStrMo>; MSVBVM60.__vbaStrMove

0103E1E8 . 50 push eax

0103E1E9 . 68 883E4500 push VisualNe.00453E88

0103E1EE . FF15 AC114000 call dword ptr ds:[<&MSVBVM60.__vbaStrCm>; MSVBVM60.__vbaStrCmp

0103E1F4 . F7D8 neg eax

0103E1F6 . 1BC0 sbb eax,eax

0103E1F8 . F7D8 neg eax

0103E1FA . F7D8 neg eax

0103E1FC . 66:8985 CCFEF>mov word ptr ss:[ebp-0x134],ax

0103E203 . 8D4D D8 lea ecx,dword ptr ss:[ebp-0x28]

0103E206 . FF15 30144000 call dword ptr ds:[<&MSVBVM60.__vbaFreeS>; MSVBVM60.__vbaFreeStr

0103E20C . 8D55 98 lea edx,dword ptr ss:[ebp-0x68]

0103E20F . 52 push edx

0103E210 . 8D45 A8 lea eax,dword ptr ss:[ebp-0x58]

0103E213 . 50 push eax

0103E214 . 6A 02 push 0x2

0103E216 . FF15 4C104000 call dword ptr ds:[<&MSVBVM60.__vbaFreeV>;

MSVBVM60.__vbaFreeVarList

0103E21C . 83C4 0C add esp,0xC

0103E21F . 0FBF8D CCFEFF>movsx ecx,word ptr ss:[ebp-0x134]

0103E226 . 85C9 test ecx,ecx

0103E228 . 0F84 DD030000 je VisualNe.0103E60B //加密狗破解关键点，NOP掉

0103E22E . C745 FC 1C000>mov dword ptr ss:[ebp-0x4],0x1C

0103E235 . C745 80 04000>mov dword ptr ss:[ebp-0x80],0x80020004

0103E23C . C785 78FFFFFF>mov dword ptr ss:[ebp-0x88],0xA

0103E246 . C745 90 04000>mov dword ptr ss:[ebp-0x70],0x80020004

0103E24D . C745 88 0A000>mov dword ptr ss:[ebp-0x78],0xA

0103E254 . C745 A0 04000>mov dword ptr ss:[ebp-0x60],0x80020004

0103E25B . C745 98 0A000>mov dword ptr ss:[ebp-0x68],0xA

0103E262 . C785 70FFFFFF>mov dword ptr ss:[ebp-0x90],VisualNe.004>

0103E26C . C785 68FFFFFF>mov dword ptr ss:[ebp-0x98],0x8