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发表于 2006-7-3 12:06:15
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我的脱壳笔记，详细+简单
FSG2.0加壳记事本脱壳
ALT+M对CODE段下内存写中断，F9，跟踪几步发现在写内存1001000处，并来到这里
010001BC F3:A4 rep movs byte ptr es:[edi], byte ptr [esi]
010001BE 5E pop esi
010001BF ^ EB 9F jmp short 01000160
010001C1 5E pop esi
010001C2 AD lods dword ptr [esi]
010001C3 97 xchg eax, edi
010001C4 AD lods dword ptr [esi]
010001C5 50 push eax ; 下一个DLL
010001C6 FF53 10 call [ebx+10] ; ds:[0101F480]=77E80221 (KERNEL32.LoadLibraryA)
010001C9 95 xchg eax, ebp
010001CA 8B07 mov eax, [edi]
010001CC 40 inc eax
010001CD ^ 78 F3 js short 010001C2
010001CF 75 03 jnz short 010001D4
010001D1 FF63 0C jmp [ebx+C] ;只有这里才能跳出循环，下断点
010001D4 50 push eax
010001D5 55 push ebp
010001D6 FF53 14 call [ebx+14] ; ds:[0101F484]=77E80CAB (KERNEL32.GetProcAddress)
010001D9 AB stos dword ptr es:[edi]
010001DA ^ EB EE jmp short 010001CA
从“010001D1 FF63 0C jmp [ebx+C]”跳出来到达0100739D，
把地址0100739D以后所有代码选上，右键-〉分析-〉视作command
0100739D 6A 70 push 70
0100739F 68 9818>push 01001898
010073A4 E8 BF01>call 01007568
010073A9 33DB xor ebx, ebx
010073AB 53 push ebx
010073AC 8B3D CC>mov edi, [10010CC] ; KERNEL32.GetModuleHandleA
010073B2 FFD7 call edi
此时，所有DLL和API解析完毕，再次ALT+M，CTRL+G 010010000，右键--〉long--〉地址，
整齐的IAT表出现了，OFFSET=010010000 SIZE=344
01001000 796F4ABA ADVAPI32.RegQueryValueExW
01001004 796F45B2 ADVAPI32.RegCloseKey
01001008 796E9954 ADVAPI32.RegCreateKeyW
0100100C 796E83F1 ADVAPI32.IsTextUnicode
01001010 796EF5E6 ADVAPI32.RegQueryValueExA
01001014 796EF4C0 ADVAPI32.RegOpenKeyExA
01001018 796EE5CB ADVAPI32.RegSetValueExW
0100101C 7FFFFFFF
01001020 717514D8 COMCTL32.CreateStatusWindowW
01001024 7FFFFFFF
01001028 77F608BF GDI32.EndPage
0100102C 77F60A90 GDI32.AbortDoc
01001030 77F609C0 GDI32.EndDoc
01001034 77F44B1E GDI32.DeleteDC
01001038 77F608DB GDI32.StartPage
0100103C 77F528FA GDI32.GetTextExtentPoint32W
01001040 77F5296F GDI32.CreateDCW
01001044 77F611A4 GDI32.SetAbortProc
01001048 77F4DA75 GDI32.GetTextFaceW
0100104C 77F43209 GDI32.TextOutW
01001050 77F60CB8 GDI32.StartDocW
01001054 77F56CFE GDI32.EnumFontsW
01001058 77F458BF GDI32.GetStockObject
0100105C 77F46EA7 GDI32.GetObjectW
01001060 77F44DA1 GDI32.GetDeviceCaps
01001064 77F4356F GDI32.CreateFontIndirectW
01001068 77F42EC7 GDI32.DeleteObject
0100106C 77F47BE8 GDI32.GetTextMetricsW
01001070 77F4243E GDI32.SetBkMode
01001074 77F47E12 GDI32.LPtoDP
01001078 77F47096 GDI32.SetWindowExtEx
0100107C 77F48972 GDI32.SetViewportExtEx
01001080 77F46486 GDI32.SetMapMode
01001084 77F41D10 GDI32.SelectObject
01001088 7FFFFFFF
0100108C 77E8BB4F KERNEL32.GetCurrentThreadId
01001090 77E6EDD2 KERNEL32.GetTickCount
01001094 77E845D7 KERNEL32.QueryPerformanceCounter
01001098 77E6EC16 KERNEL32.GetLocalTime
0100109C 77EA10A3 KERNEL32.GetUserDefaultLCID
010010A0 77EABF09 KERNEL32.GetDateFormatW
010010A4 77EABD7F KERNEL32.GetTimeFormatW
010010A8 77E7E08F KERNEL32.GlobalLock
010010AC 77E7E237 KERNEL32.GlobalUnlock
010010B0 77E76792 KERNEL32.GetFileInformationByHandle
010010B4 77E76F47 KERNEL32.CreateFileMappingW
010010B8 77E6ED16 KERNEL32.GetSystemTimeAsFileTime
010010BC 77E86A51 KERNEL32.TerminateProcess
010010C0 77E87909 KERNEL32.GetCurrentProcess
010010C4 77E8BC45 KERNEL32.SetUnhandledExceptionFilter
010010C8 77E80221 KERNEL32.LoadLibraryA
010010CC 77E80B1A KERNEL32.GetModuleHandleA
010010D0 77E86B5E KERNEL32.GetStartupInfoA
010010D4 77E7E533 KERNEL32.GlobalFree
010010D8 77EA1245 KERNEL32.GetLocaleInfoW
010010DC 77E692B8 KERNEL32.LocalFree
010010E0 77E69129 KERNEL32.LocalAlloc
010010E4 77E7F462 KERNEL32.lstrlenW
010010E8 77E69547 KERNEL32.LocalUnlock
010010EC 77E69802 KERNEL32.CompareStringW
010010F0 77E69625 KERNEL32.LocalLock
010010F4 77EA5690 KERNEL32.FoldStringW
010010F8 77E67E6D KERNEL32.CloseHandle
010010FC 77E6AB2C KERNEL32.lstrcpyW
01001100 77E761B4 KERNEL32.ReadFile
01001104 77E7C229 KERNEL32.CreateFileW
01001108 77E6B2D1 KERNEL32.lstrcmpiW
0100110C 77E8790D KERNEL32.GetCurrentProcessId
01001110 77E80CAB KERNEL32.GetProcAddress
01001114 77E86E45 KERNEL32.GetCommandLineW
01001118 77E7F407 KERNEL32.lstrcatW
0100111C 77E758BE KERNEL32.FindClose
01001120 77E75615 KERNEL32.FindFirstFileW
01001124 77E7741C KERNEL32.GetFileAttributesW
01001128 77E6AAC8 KERNEL32.lstrcmpW
0100112C 77E6B5E0 KERNEL32.MulDiv
01001130 77E7F377 KERNEL32.lstrcpynW
01001134 77E7F4BF KERNEL32.LocalSize
01001138 77E68265 KERNEL32.GetLastError
0100113C 77E7639C KERNEL32.WriteFile
01001140 77E68252 KERNEL32.SetLastError
01001144 77EA906F KERNEL32.WideCharToMultiByte
01001148 77E6A302 KERNEL32.LocalReAlloc
0100114C 77E7FDE2 KERNEL32.FormatMessageW
01001150 77EA106B KERNEL32.GetUserDefaultUILanguage
01001154 77E76502 KERNEL32.SetEndOfFile
01001158 77E775F7 KERNEL32.DeleteFileW
0100115C 77EA811A KERNEL32.GetACP
01001160 77E77279 KERNEL32.UnmapViewOfFile
01001164 77EA87E2 KERNEL32.MultiByteToWideChar
01001168 77E771A8 KERNEL32.MapViewOfFile
0100116C 77E8BD28 KERNEL32.UnhandledExceptionFilter
01001170 7FFFFFFF
01001174 790044BB SHELL32.DragFinish
01001178 78FC610D SHELL32.DragQueryFileW
0100117C 78FD0C0C SHELL32.DragAcceptFiles
01001180 78FD13FC SHELL32.ShellAboutW
01001184 7FFFFFFF
01001188 77E1C62B USER32.GetClientRect
0100118C 77E1C1E3 USER32.SetCursor
01001190 77E1AAC7 USER32.ReleaseDC
01001194 77E1AAB4 USER32.GetDC
01001198 77E09187 USER32.DialogBoxParamW
0100119C 77E189A3 USER32.SetActiveWindow
010011A0 77E00DC9 USER32.GetKeyboardLayout
010011A4 77E1C133 USER32.DefWindowProcW
010011A8 77E13F1D USER32.DestroyWindow
010011AC 77DFF38E USER32.MessageBeep
010011B0 77E19E55 USER32.ShowWindow
010011B4 77E124E8 USER32.GetForegroundWindow
010011B8 77E1B4E2 USER32.IsIconic
010011BC 77E1B44B USER32.GetWindowPlacement
010011C0 77E04A62 USER32.CharUpperW
010011C4 77E1B552 USER32.LoadStringW
010011C8 77E0F8EE USER32.LoadAcceleratorsW
010011CC 77E116BD USER32.GetSystemMenu
010011D0 77E02787 USER32.RegisterClassExW
010011D4 77E09659 USER32.LoadImageW
010011D8 77E22985 USER32.LoadCursorW
010011DC 77E00054 USER32.SetWindowPlacement
010011E0 77E123C2 USER32.CreateWindowExW
010011E4 77E0C063 USER32.GetDesktopWindow
010011E8 77E1BB82 USER32.GetFocus
010011EC 77E084D6 USER32.LoadIconW
010011F0 77E1B9CA USER32.SetWindowTextW
010011F4 77E0806A USER32.PostQuitMessage
010011F8 77E0B350 USER32.RegisterWindowMessageW
010011FC 77E1B1D2 USER32.UpdateWindow
01001200 77E080B8 USER32.SetScrollPos
01001204 77E1332E USER32.CharLowerW
01001208 77E1C53F USER32.PeekMessageW
0100120C 77E195AC USER32.EnableWindow
01001210 77E1AA4B USER32.DrawTextExW
01001214 77E09F33 USER32.CreateDialogParamW
01001218 77E16176 USER32.GetWindowTextW
0100121C 77E13277 USER32.GetSystemMetrics
01001220 77E0D262 USER32.MoveWindow
01001224 77E1B395 USER32.InvalidateRect
01001228 77E05C1C USER32.WinHelpW
0100122C 77E1BE2F USER32.GetDlgCtrlID
01001230 77E0596E USER32.ChildWindowFromPoint
01001234 77E1CD38 USER32.ScreenToClient
01001238 77E1C797 USER32.GetCursorPos
0100123C 77E0F16B USER32.SendDlgItemMessageW
01001240 77E1B7C8 USER32.SendMessageW
01001244 77E13EBD USER32.CharNextW
01001248 77E0A495 USER32.CheckMenuItem
0100124C 77E009BB USER32.CloseClipboard
01001250 77E0025D USER32.IsClipboardFormatAvailable
01001254 77E009CC USER32.OpenClipboard
01001258 77E0A5DC USER32.GetMenuState
0100125C 77E0A3D8 USER32.EnableMenuItem
01001260 77E115B1 USER32.GetSubMenu
01001264 77E0A44F USER32.GetMenu
01001268 77DFB70F USER32.MessageBoxW
0100126C 77E1266A USER32.SetWindowLongW
01001270 77E21760 USER32.GetWindowLongW
01001274 77E139AB USER32.GetDlgItem
01001278 77E13AC0 USER32.SetFocus
0100127C 77E0A2A1 USER32.SetDlgItemTextW
01001280 77E1A0A0 USER32.wsprintfW
01001284 77E0F239 USER32.GetDlgItemTextW
01001288 77E16BC5 USER32.EndDialog
0100128C 77E19794 USER32.GetParent
01001290 77DFFECF USER32.UnhookWinEvent
01001294 77E21E73 USER32.DispatchMessageW
01001298 77E21E49 USER32.TranslateMessage
0100129C 77E1BF08 USER32.TranslateAcceleratorW
010012A0 77E129CA USER32.IsDialogMessageW
010012A4 77E23415 USER32.PostMessageW
010012A8 77E21EBB USER32.GetMessageW
010012AC 77DFD504 USER32.SetWinEventHook
010012B0 FFFFFFFF
010012B4 777C4DD4 WINSPOOL.GetPrinterDriverW
010012B8 777C4964 WINSPOOL.ClosePrinter
010012BC 777C44A4 WINSPOOL.OpenPrinterW
010012C0 7FFFFFFF
010012C4 76B0987A comdlg32.PageSetupDlgW
010012C8 76B0556C comdlg32.FindTextW
010012CC 76B0E83C comdlg32.PrintDlgExW
010012D0 76B05ABD comdlg32.ChooseFontW
010012D4 76AF16E2 comdlg32.GetFileTitleW
010012D8 76AFED3F comdlg32.GetOpenFileNameW
010012DC 76B0557C comdlg32.ReplaceTextW
010012E0 76AFDFE8 comdlg32.CommDlgExtendedError
010012E4 76AFED9B comdlg32.GetSaveFileNameW
010012E8 7FFFFFFF
010012EC 7800C03E msvcrt._XcptFilter
010012F0 78007CDA msvcrt._exit
010012F4 780011B7 msvcrt._c_exit
010012F8 780290A1 msvcrt.time
010012FC 78028D0E msvcrt.localtime
01001300 78007CEB msvcrt._cexit
01001304 780127FF msvcrt.iswctype
01001308 7800BD6A msvcrt._except_handler3
0100130C 780145C2 msvcrt._wtol
01001310 78027782 msvcrt.wcsncmp
01001314 7802197B msvcrt._snwprintf
01001318 78007C53 msvcrt.exit
0100131C 7803A020 offset msvcrt._acmdln
01001320 78007EDA msvcrt.__getmainargs
01001324 7800119B msvcrt._initterm
01001328 78007778 msvcrt.__setusermatherr
0100132C 7803A670 offset msvcrt._adjust_fdiv
01001330 78007FB9 msvcrt.__p__commode
01001334 78007FD7 msvcrt.__p__fmode
01001338 7800776E msvcrt.__set_app_type
0100133C 78001EC9 msvcrt._controlfp
01001340 780104FC msvcrt.wcsncpy
01001344 7FFFFFFF
01001348 00000000
再仔细看这段，怎么那么像未加壳的记事本呀
0100739D 6A 70 push 70
0100739F 68 9818>push 01001898
010073A4 E8 BF01>call 01007568
010073A9 33DB xor ebx, ebx
010073AB 53 push ebx
010073AC 8B3D CC>mov edi, [10010CC] ; KERNEL32.GetModuleHandleA
010073B2 FFD7 call edi
010073B4 66:8138>cmp word ptr [eax], 5A4D ; [eax]="MZ"?, 看是不是PE头
010073B9 75 1F jnz short 010073DA
010073BB 8B48 3C mov ecx, [eax+3C]
010073BE 03C8 add ecx, eax
010073C0 8139 50>cmp dword ptr [ecx], 4550
010073C6 75 12 jnz short 010073DA
010073C8 0FB741 >movzx eax, word ptr [ecx+18]
010073CC 3D 0B01>cmp eax, 10B
010073D1 74 1F je short 010073F2
010073D3 3D 0B02>cmp eax, 20B
010073D8 74 05 je short 010073DF
010073DA 895D E4 mov [ebp-1C], ebx
010073DD EB 27 jmp short 01007406
010073DF 83B9 84>cmp dword ptr [ecx+84], 0E
010073E6 ^ 76 F2 jbe short 010073DA
010073E8 33C0 xor eax, eax
010073EA 3999 F8>cmp [ecx+F8], ebx
010073F0 EB 0E jmp short 01007400
010073F2 8379 74>cmp dword ptr [ecx+74], 0E
010073F6 ^ 76 E2 jbe short 010073DA
010073F8 33C0 xor eax, eax
010073FA 3999 E8>cmp [ecx+E8], ebx
01007400 0F95C0 setne al
01007403 8945 E4 mov [ebp-1C], eax
01007406 895D FC mov [ebp-4], ebx
01007409 6A 02 push 2
0100740B FF15 38>call [1001338] ; msvcrt.__set_app_type
01007411 59 pop ecx
01007412 830D 9C>or dword ptr [100AB9C], FFFFFFFF
01007419 830D A0>or dword ptr [100ABA0], FFFFFFFF
01007420 FF15 34>call [1001334] ; msvcrt.__p__fmode
01007426 8B0D B8>mov ecx, [1009AB8]
0100742C 8908 mov [eax], ecx
0100742E FF15 30>call [1001330] ; msvcrt.__p__commode
01007434 8B0D B4>mov ecx, [1009AB4]
0100743A 8908 mov [eax], ecx
0100743C A1 2C13>mov eax, [100132C]
01007441 8B00 mov eax, [eax]
01007443 A3 A4AB>mov [100ABA4], eax
01007448 E8 A701>call 010075F4
0100744D 391D 08>cmp [1009608], ebx
01007453 75 0C jnz short 01007461
01007455 68 F475>push 010075F4
0100745A FF15 28>call [1001328] ; msvcrt.__setusermatherr
01007460 59 pop ecx
01007461 E8 7701>call 010075DD
01007466 68 1090>push 01009010
0100746B 68 0C90>push 0100900C
01007470 E8 5D01>call 010075D2 ; jmp 到 msvcrt._initterm
01007475 A1 B09A>mov eax, [1009AB0]
0100747A 8945 DC mov [ebp-24], eax
0100747D 8D45 DC lea eax, [ebp-24]
01007480 50 push eax
01007481 FF35 AC>push dword ptr [1009AAC]
01007487 8D45 D4 lea eax, [ebp-2C]
0100748A 50 push eax
0100748B 8D45 D0 lea eax, [ebp-30]
0100748E 50 push eax
0100748F 8D45 CC lea eax, [ebp-34]
01007492 50 push eax
01007493 FF15 20>call [1001320] ; msvcrt.__getmainargs
对比不加壳的记事本：
01006420 > $ 5>push ebp
01006421 . 8>mov ebp, esp
01006423 . 6>push -1
01006425 . 6>push 01001888
0100642A . 6>push <jmp.&MSVCRT._except_handler3> ; SE 处理程序安装
0100642F . 6>mov eax, fs:[0]
01006435 . 5>push eax
01006436 . 6>mov fs:[0], esp
0100643D . 8>add esp, -68
01006440 . 5>push ebx
01006441 . 5>push esi
01006442 . 5>push edi
01006443 . 8>mov [ebp-18], esp
01006446 . C>mov dword ptr [ebp-4], 0
0100644D . 6>push 2
0100644F . F>call [<&MSVCRT.__set_app_type>] ; msvcrt.__set_app_type
01006455 . 8>add esp, 4
01006458 . C>mov dword ptr [1009938], -1
01006462 . C>mov dword ptr [100993C], -1
0100646C . F>call [<&MSVCRT.__p__fmode>] ; msvcrt.__p__fmode
01006472 . 8>mov ecx, [1008844]
01006478 . 8>mov [eax], ecx
0100647A . F>call [<&MSVCRT.__p__commode>] ; msvcrt.__p__commode
01006480 . 8>mov edx, [1008840]
01006486 . 8>mov [eax], edx
01006488 . A>mov eax, [<&MSVCRT._adjust_fdiv>]
0100648D . 8>mov ecx, [eax]
0100648F . 8>mov [1009940], ecx
01006495 . E>call 01006620
0100649A . A>mov eax, [10085C0]
0100649F . 8>test eax, eax
010064A1 . 7>jnz short 010064B1
010064A3 . 6>push 01006610
010064A8 . F>call [<&MSVCRT.__setusermatherr>] ; msvcrt.__setusermatherr
010064AE . 8>add esp, 4
010064B1 > E>call 010065F0
010064B6 . 6>push 0100800C
010064BB . 6>push 01008008
010064C0 . E>call <jmp.&MSVCRT._initterm>
010064C5 . 8>add esp, 8
010064C8 . 8>mov edx, [100883C]
010064CE . 8>mov [ebp-6C], edx
010064D1 . 8>lea eax, [ebp-6C]
010064D4 . 5>push eax
010064D5 . 8>mov ecx, [1008838]
010064DB . 5>push ecx
010064DC . 8>lea edx, [ebp-64]
010064DF . 5>push edx
010064E0 . 8>lea eax, [ebp-70]
010064E3 . 5>push eax
010064E4 . 8>lea ecx, [ebp-60]
010064E7 . 5>push ecx
010064E8 . F>call [<&MSVCRT.__getmainargs>] ; msvcrt.__getmainargs
虽然头部有点不同，但作用是一样地，就是检查PE头是否有效。
好了，DUMP吧，OEP=739D，然后ImpREC1.6final修复，IAT RVA=1000 SIZE=344，获取输入表，
显示有一个无效指针，把它剪切了，再看，IAT表完整显现了。
FIX DUMP，
运行修复后的程序，很好，正常运行。
收工！
快雪时晴，2006-7-3 |
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