環境
Windows xp sp3

工具
1.exeinfo PE
2.ollydbg

查殼
OD載入后可以看出是VB程序

測試
輸入：12345678

顯示的內容發生了改變，也不影響查找字符串。

004FEC14 > \8B4D E8 mov ecx,dword ptr ss:[ebp-0x18] 004FEC17 . 51 push ecx 004FEC18 . 68 E41B4000 push cupofcof.00401BE4 ; UNICODE ".........." 004FEC1D . FF15 F8105000 call dword ptr ds:[<&MSVBVM50.__vbaStrCm>; MSVBVM50.__vbaStrCmp 004FEC23 . 8BF0 mov esi,eax 004FEC25 . 8D4D E8 lea ecx,dword ptr ss:[ebp-0x18] 004FEC28 . F7DE neg esi 004FEC2A . 1BF6 sbb esi,esi 004FEC2C . F7DE neg esi 004FEC2E . F7DE neg esi 004FEC30 . FF15 4C115000 call dword ptr ds:[<&MSVBVM50.__vbaFreeS>; MSVBVM50.__vbaFreeStr 004FEC36 . 8D4D E4 lea ecx,dword ptr ss:[ebp-0x1C] 004FEC39 . FF15 50115000 call dword ptr ds:[<&MSVBVM50.__vbaFreeO>; MSVBVM50.__vbaFreeObj 004FEC3F . 66:3BF7 cmp si,di 004FEC42 . 74 6E je Xcupofcof.004FECB2 004FEC44 . B9 04000280 mov ecx,0x80020004 004FEC49 . B8 0A000000 mov eax,0xA 004FEC4E . 894D AC mov dword ptr ss:[ebp-0x54],ecx 004FEC51 . 894D BC mov dword ptr ss:[ebp-0x44],ecx 004FEC54 . 894D CC mov dword ptr ss:[ebp-0x34],ecx 004FEC57 . 8D55 94 lea edx,dword ptr ss:[ebp-0x6C] 004FEC5A . 8D4D D4 lea ecx,dword ptr ss:[ebp-0x2C] 004FEC5D . 8945 A4 mov dword ptr ss:[ebp-0x5C],eax 004FEC60 . 8945 B4 mov dword ptr ss:[ebp-0x4C],eax 004FEC63 . 8945 C4 mov dword ptr ss:[ebp-0x3C],eax 004FEC66 . C745 9C 001C4>mov dword ptr ss:[ebp-0x64],cupofcof.004>; UNICODE "Incorrect password" 004FEC6D . C745 94 08000>mov dword ptr ss:[ebp-0x6C],0x8 004FEC74 . FF15 38115000 call dword ptr ds:[<&MSVBVM50.__vbaVarDu>; MSVBVM50.__vbaVarDup 004FEC7A . 8D55 A4 lea edx,dword ptr ss:[ebp-0x5C] 004FEC7D . 8D45 B4 lea eax,dword ptr ss:[ebp-0x4C] 004FEC80 . 52 push edx 004FEC81 . 8D4D C4 lea ecx,dword ptr ss:[ebp-0x3C] 004FEC84 . 50 push eax 004FEC85 . 51 push ecx 004FEC86 . 8D55 D4 lea edx,dword ptr ss:[ebp-0x2C] 004FEC89 . 6A 10 push 0x10 004FEC8B . 52 push edx 004FEC8C . FF15 E0105000 call dword ptr ds:[<&MSVBVM50.#595>] ; MSVBVM50.rtcMsgBox

[004FEC18]里可以看出明文比較，10個“.”

有點可怕

總結

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