一个小程序自校验分析

A-new · 发表于 2017-11-20 12:56

本帖最后由 A-new 于 2017-11-21 12:19 编辑

看这个小程序源于@刘统宝的一个求助贴https://www.52pojie.cn/thread-660923-1-1.html
仔细看了一下这个小程序自校验方法比较经典吧，就给大家写一下
首先是分析的总结这个程序自校验涉及三个自校验点：1、文件修改时间校验2、文件大小校验、3CRC校验
原程序加了Aspack壳，脱壳就不介绍了ESP就可以搞定直接进入主题
整个校验流程就在这一段

[Asm] 纯文本查看 复制代码

0045F93C   .  8B00          mov     eax, dword ptr [eax]0045F93E   .  E8 09BEFFFF   call    <Forms.TApplication.GetExeName>
0045F943      C705 6C1F4700>mov     dword ptr [0x471F6C], 0x35C14    ;  文件大小
0045F94D   .  8B45 F0       mov     eax, dword ptr [ebp-0x10]
0045F950   .  E8 A3F0FFFF   call    <MiFareProg.sub_0045E9F8> ；读取文件大小
0045F955   .  A3 701F4700   mov     dword ptr [0x471F70], eax
0045F95A   .  33C0          xor     eax, eax
0045F95C   .  55            push    ebp
0045F95D   .  68 80F94500   push    0045F980
0045F962   .  64:FF30       push    dword ptr fs:[eax]
0045F965   .  64:8920       mov     dword ptr fs:[eax], esp
0045F968   .  B8 B4FF4500   mov     eax, 0045FFB4                    ;  2017-07-18 10:10
0045F96D   .  E8 52BCFAFF   call    <SysUtils.StrToDateTime>
0045F972   .  DD5D E0       fstp    qword ptr [ebp-0x20]
0045F975   .  9B            wait
0045F976   .  33C0          xor     eax, eax
0045F978   .  5A            pop     edx
0045F979   .  59            pop     ecx
0045F97A   .  59            pop     ecx
0045F97B   .  64:8910       mov     dword ptr fs:[eax], edx
0045F97E   .  EB 18         jmp     short 0045F998
0045F980   .^ E9 8342FAFF   jmp     <System.@HandleAnyException>
0045F985   .  B8 D0FF4500   mov     eax, 0045FFD0                    ;  2017/07/18 10:10
0045F98A   .  E8 35BCFAFF   call    <SysUtils.StrToDateTime>
0045F98F   .  DD5D E0       fstp    qword ptr [ebp-0x20]
0045F992   .  9B            wait
0045F993   .  E8 D845FAFF   call    <System.@DoneExcept>
0045F998   >  BA 02000000   mov     edx, 0x2
0045F99D   .  8B45 F0       mov     eax, dword ptr [ebp-0x10]
0045F9A0   .  E8 77EFFFFF   call    <MiFareProg.sub_0045E91C>
0045F9A5   .  DD5D E8       fstp    qword ptr [ebp-0x18]
0045F9A8   .  9B            wait
0045F9A9   .  EB 0C         jmp     short 0045F9B7
0045F9AB   >  A1 E0054700   mov     eax, dword ptr [0x4705E0]
0045F9B0   .  8B00          mov     eax, dword ptr [eax]
0045F9B2   .  E8 71B8FFFF   call    <Forms.TApplication.Terminate>
0045F9B7   >  FF75 EC       push    dword ptr [ebp-0x14]
0045F9BA   .  FF75 E8       push    dword ptr [ebp-0x18]
0045F9BD   .  FF75 E4       push    dword ptr [ebp-0x1C]
0045F9C0   .  FF75 E0       push    dword ptr [ebp-0x20]
0045F9C3   .  E8 8CCCFFFF   call    <_Unit58.sub_0045C654>
0045F9C8   .  48            dec     eax
0045F9C9    ^ 7F E0         jg      short 0045F9AB
0045F9CB   .  A1 701F4700   mov     eax, dword ptr [0x471F70]
0045F9D0   .  3B05 6C1F4700 cmp     eax, dword ptr [0x471F6C]
0045F9D6   .  7C 1F         jl      short 0045F9F7
0045F9D8   .  8B45 FC       mov     eax, dword ptr [ebp-0x4]
0045F9DB   .  8B80 F8020000 mov     eax, dword ptr [eax+0x2F8]
0045F9E1   .  BA ECFF4500   mov     edx, 0045FFEC                    ;  请交出你的比特币，嗯哼.....
0045F9E6   .  E8 55BFFDFF   call    <Controls.TControl.SetText>
0045F9EB   .  A1 E0054700   mov     eax, dword ptr [0x4705E0]
0045F9F0   .  8B00          mov     eax, dword ptr [eax]
0045F9F2   .  E8 31B8FFFF   call    <Forms.TApplication.Terminate>
0045F9F7   >  B8 7C1F4700   mov     eax, 00471F7C
0045F9FC   .  BA 10004600   mov     edx, 00460010                    ;  IC卡操作软件Ver1.0 For Acr122u
0045FA01   .  E8 064BFAFF   call    <System.@LStrAsg>
0045FA06   .  8B15 7C1F4700 mov     edx, dword ptr [0x471F7C]
0045FA0C   .  A1 0C1C4700   mov     eax, dword ptr [0x471C0C]
0045FA11   .  E8 2ABFFDFF   call    <Controls.TControl.SetText>
0045FA16   .  68 30004600   push    00460030                         ; /myhotkey
0045FA1B   .  E8 E46BFAFF   call    <Windows.kernel32.GlobalAddAtomA>; \GlobalAddAtomA
0045FA20   .  0FB7C0        movzx   eax, ax
0045FA23   .  2D 00C00000   sub     eax, 0xC000
0045FA28   .  A3 5C1F4700   mov     dword ptr [0x471F5C], eax
0045FA2D   .  6A 79         push    0x79
0045FA2F   .  6A 00         push    0x0
0045FA31   .  A1 5C1F4700   mov     eax, dword ptr [0x471F5C]
0045FA36   .  50            push    eax
0045FA37   .  8B45 FC       mov     eax, dword ptr [ebp-0x4]
0045FA3A   .  E8 CD27FEFF   call    <Controls.TWinControl.GetHandle>
0045FA3F   .  50            push    eax                              ; |hWnd
0045FA40   .  E8 AF72FAFF   call    <Windows.user32.RegisterHotKey>  ; \RegisterHotKey
0045FA45   .  C605 601F4700>mov     byte ptr [0x471F60], 0x0
0045FA4C   .  33C0          xor     eax, eax
0045FA4E   .  A3 581F4700   mov     dword ptr [0x471F58], eax
0045FA53   .  8D55 D4       lea     edx, dword ptr [ebp-0x2C]
0045FA56   .  A1 E0054700   mov     eax, dword ptr [0x4705E0]
0045FA5B   .  8B00          mov     eax, dword ptr [eax]
0045FA5D   .  E8 EABCFFFF   call    <Forms.TApplication.GetExeName>
0045FA62   .  8B45 D4       mov     eax, dword ptr [ebp-0x2C]
0045FA65   .  8D55 D8       lea     edx, dword ptr [ebp-0x28]
0045FA68   .  E8 F390FAFF   call    <SysUtils.ExtractFilePath>
0045FA6D   .  8D45 D8       lea     eax, dword ptr [ebp-0x28]
0045FA70   .  BA 44004600   mov     edx, 00460044                    ;  sysinf.ini
0045FA75   .  E8 064DFAFF   call    <System.@LStrCat>
0045FA7A   .  8B4D D8       mov     ecx, dword ptr [ebp-0x28]
0045FA7D   .  B2 01         mov     dl, 0x1
0045FA7F   .  A1 DCB34200   mov     eax, dword ptr [0x42B3DC]        ;  附B
0045FA84   .  E8 03BAFCFF   call    <IniFiles.TIniFile.Create>
0045FA89   .  A3 541F4700   mov     dword ptr [0x471F54], eax
0045FA8E   .  68 58004600   push    00460058                         ;  ABCDEF9876543210
0045FA93   .  8D45 D0       lea     eax, dword ptr [ebp-0x30]
0045FA96   .  50            push    eax
0045FA97   .  B9 74004600   mov     ecx, 00460074                    ;  zcm
0045FA9C   .  BA 80004600   mov     edx, 00460080                    ;  softinfo
0045FAA1   .  A1 541F4700   mov     eax, dword ptr [0x471F54]
0045FAA6   .  8B18          mov     ebx, dword ptr [eax]
0045FAA8   .  FF13          call    dword ptr [ebx]
0045FAAA   .  8B55 D0       mov     edx, dword ptr [ebp-0x30]
0045FAAD   .  B8 681F4700   mov     eax, 00471F68
0045FAB2   .  E8 554AFAFF   call    <System.@LStrAsg>
0045FAB7   .  68 94004600   push    00460094                         ;  33434E44314332443336
0045FABC   .  8D45 CC       lea     eax, dword ptr [ebp-0x34]
0045FABF   .  50            push    eax
0045FAC0   .  B9 B4004600   mov     ecx, 004600B4                    ;  sellerID
0045FAC5   .  BA 80004600   mov     edx, 00460080                    ;  softinfo
0045FACA   .  A1 541F4700   mov     eax, dword ptr [0x471F54]
0045FACF   .  8B18          mov     ebx, dword ptr [eax]
0045FAD1   .  FF13          call    dword ptr [ebx]
0045FAD3   .  8B55 CC       mov     edx, dword ptr [ebp-0x34]
0045FAD6   .  B8 741F4700   mov     eax, 00471F74
0045FADB   .  E8 2C4AFAFF   call    <System.@LStrAsg>
0045FAE0   .  8D55 F8       lea     edx, dword ptr [ebp-0x8]
0045FAE3   .  A1 741F4700   mov     eax, dword ptr [0x471F74]
0045FAE8   .  E8 0BEBFFFF   call    <MiFareProg.sub_0045E5F8>
0045FAED   .  68 741F4700   push    00471F74
0045FAF2   .  B9 08000000   mov     ecx, 0x8
0045FAF7   .  BA 02000000   mov     edx, 0x2
0045FAFC   .  8B45 F8       mov     eax, dword ptr [ebp-0x8]
0045FAFF   .  E8 D44EFAFF   call    <System.@LStrCopy>
0045FB04   .  8D55 DC       lea     edx, dword ptr [ebp-0x24]
0045FB07   .  8B45 F0       mov     eax, dword ptr [ebp-0x10]
0045FB0A   .  E8 E1E6FFFF   call    <MiFareProg.sub_0045E1F0>        ;  crc
0045FB0F   .  8B45 DC       mov     eax, dword ptr [ebp-0x24]
0045FB12   .  F7D0          not     eax
0045FB14   .  33D2          xor     edx, edx
0045FB16   .  52            push    edx                              ;  4AE770C6
0045FB17   .  50            push    eax
0045FB18   .  8D55 C8       lea     edx, dword ptr [ebp-0x38]
0045FB1B   .  B8 08000000   mov     eax, 0x8
0045FB20   .  E8 C38BFAFF   call    <SysUtils.IntToHex>
0045FB25   .  8B45 C8       mov     eax, dword ptr [ebp-0x38]
0045FB28   .  E8 4B4EFAFF   call    <System.@LStrToPChar>
0045FB2D   .  8BD0          mov     edx, eax
0045FB2F   .  B8 781F4700   mov     eax, 00471F78
0045FB34   .  E8 774BFAFF   call    <System.@LStrFromPChar>
0045FB39   .  EB 0C         jmp     short 0045FB47
0045FB3B   >  A1 E0054700   mov     eax, dword ptr [0x4705E0]
0045FB40   .  8B00          mov     eax, dword ptr [eax]
0045FB42   .  E8 E1B6FFFF   call    <Forms.TApplication.Terminate>
0045FB47   >  A1 741F4700   mov     eax, dword ptr [0x471F74]
0045FB4C   .  8B15 781F4700 mov     edx, dword ptr [0x471F78]
0045FB52   .  E8 6D4DFAFF   call    <System.@LStrCmp>
0045FB57    ^ 75 E2         jnz     short 0045FB3B
0045FB59   .  E8 2AE9FFFF   call    <MiFareProg.sub_0045E488>

1、文件时间校验

[Asm] 纯文本查看 复制代码

0045F968   .  B8 B4FF4500   mov     eax, 0045FFB4                    ;  2017-07-18 10:10
0045F96D   .  E8 52BCFAFF   call    <SysUtils.StrToDateTime>
0045F972   .  DD5D E0       fstp    qword ptr [ebp-0x20]
0045F975   .  9B            wait
0045F976   .  33C0          xor     eax, eax
0045F978   .  5A            pop     edx
0045F979   .  59            pop     ecx
0045F97A   .  59            pop     ecx
0045F97B   .  64:8910       mov     dword ptr fs:[eax], edx
0045F97E   .  EB 18         jmp     short 0045F998
0045F980   .^ E9 8342FAFF   jmp     <System.@HandleAnyException>
0045F985   .  B8 D0FF4500   mov     eax, 0045FFD0                    ;  2017/07/18 10:10
0045F98A   .  E8 35BCFAFF   call    <SysUtils.StrToDateTime>
0045F98F   .  DD5D E0       fstp    qword ptr [ebp-0x20]
0045F992   .  9B            wait
0045F993   .  E8 D845FAFF   call    <System.@DoneExcept>
0045F998   >  BA 02000000   mov     edx, 0x2
0045F99D   .  8B45 F0       mov     eax, dword ptr [ebp-0x10]
0045F9A0   .  E8 77EFFFFF   call    <MiFareProg.sub_0045E91C>
0045F9A5   .  DD5D E8       fstp    qword ptr [ebp-0x18]

对比的时间是可能是2017-07-18 10:10
原文件的修改时间是2017-07-18，12:54:48
刚开始没注意这个浪费了不少时间
再看他如何获取文件修改时间的
注意这个call

[Asm] 纯文本查看 复制代码

0045F9A0   .  E8 77EFFFFF   call    <MiFareProg.sub_0045E91C>

函数主要内容

[Asm] 纯文本查看 复制代码

0045E950  |.  50            push    eax                              ; |FileName
0045E951  |.  E8 D67BFAFF   call    <Windows.kernel32.FindFirstFileA>; \FindFirstFileA
0045E956  |.  83F8 FF       cmp     eax, -0x1
0045E959  |.  74 76         je      short 0045E9D1
0045E95B  |.  83EB 01       sub     ebx, 0x1                         ;  Switch (cases 1..2)
0045E95E  |.  72 07         jb      short 0045E967
0045E960  |.  74 19         je      short 0045E97B
0045E962  |.  4B            dec     ebx
0045E963  |.  74 2A         je      short 0045E98F
0045E965  |.  EB 3A         jmp     short 0045E9A1
0045E967  |>  8B95 A4FEFFFF mov     edx, dword ptr [ebp-0x15C]
0045E96D  |.  8955 E0       mov     dword ptr [ebp-0x20], edx
0045E970  |.  8B95 A8FEFFFF mov     edx, dword ptr [ebp-0x158]
0045E976  |.  8955 E4       mov     dword ptr [ebp-0x1C], edx
0045E979  |.  EB 26         jmp     short 0045E9A1
0045E97B  |>  8B95 ACFEFFFF mov     edx, dword ptr [ebp-0x154]       ;  Case 1 of switch 0045E95B
0045E981  |.  8955 E0       mov     dword ptr [ebp-0x20], edx
0045E984  |.  8B95 B0FEFFFF mov     edx, dword ptr [ebp-0x150]
0045E98A  |.  8955 E4       mov     dword ptr [ebp-0x1C], edx
0045E98D  |.  EB 12         jmp     short 0045E9A1
0045E98F  |>  8B95 B4FEFFFF mov     edx, dword ptr [ebp-0x14C]       ;  Case 2 of switch 0045E95B
0045E995  |.  8955 E0       mov     dword ptr [ebp-0x20], edx
0045E998  |.  8B95 B8FEFFFF mov     edx, dword ptr [ebp-0x148]
0045E99E  |.  8955 E4       mov     dword ptr [ebp-0x1C], edx
0045E9A1  |>  50            push    eax                              ; /hSearch; Default case of switch 0045E95B
0045E9A2  |.  E8 7D7BFAFF   call    <Windows.kernel32.FindClose>     ; \FindClose
0045E9A7  |.  8D45 E8       lea     eax, dword ptr [ebp-0x18]
0045E9AA  |.  50            push    eax                              ; /pLocalFileTime
0045E9AB  |.  8D45 E0       lea     eax, dword ptr [ebp-0x20]        ; |
0045E9AE  |.  50            push    eax                              ; |pFileTime
0045E9AF  |.  E8 687BFAFF   call    <Windows.kernel32.FileTimeToLoca>; \FileTimeToLocalFileTime
0045E9B4  |.  8D45 FC       lea     eax, dword ptr [ebp-0x4]
0045E9B7  |.  50            push    eax                              ; /pDOSTime
0045E9B8  |.  8D45 FE       lea     eax, dword ptr [ebp-0x2]         ; |
0045E9BB  |.  50            push    eax                              ; |pDOSDate
0045E9BC  |.  8D45 E8       lea     eax, dword ptr [ebp-0x18]        ; |
0045E9BF  |.  50            push    eax                              ; |pFileTime
0045E9C0  |.  E8 4F7BFAFF   call    <Windows.kernel32.FileTimeToDosD>; \FileTimeToDosDateTime
0045E9C5  |.  8B45 FC       mov     eax, dword ptr [ebp-0x4]
0045E9C8  |.  E8 4BA3FAFF   call    <SysUtils.FileDateToDateTime>
0045E9CD  |.  DD5D F0       fstp    qword ptr [ebp-0x10]
0045E9D0  |.  9B            wait
0045E9D1  |>  33C0          xor     eax, eax

FindFirstFileA这个函数比较有意思一直以为获取文件时间要用GetFileTime之类
原来用这个

HANDLE WINAPI FindFirstFile(
_In_ LPCTSTR lpFileName,
_Out_ LPWIN32_FIND_DATA lpFindFileData
);

返回值已经包含了文件的好多信息

typedef struct _WIN32_FIND_DATA {
  DWORD dwFileAttributes;//文件属性
  FILETIME ftCreationTime;//文件的创建日期
  FILETIME ftLastAccessTime;//文件的最后存取日期
  FILETIME ftLastWriteTime;//文件的最后修改日期
  DWORD nFileSizeHigh;//文件长度的高32位
  DWORD nFileSizeLow;//文件长度的低32位
  DWORD dwReserved0;
  DWORD dwReserved1;
  TCHAR cFileName[MAX_PATH];//本次找到的文件名
  TCHAR cAlternateFileName[14];//文件的8.3结构的短文件名
} WIN32_FIND_DATA, *PWIN32_FIND_DATA, *LPWIN32_FIND_DATA;

这里简单的方法是修改脱壳文件修改时间这就要用到NewFileTime这个小工具
2、大小校验

[Asm] 纯文本查看 复制代码

0045F943      C705 6C1F4700>mov     dword ptr [0x471F6C], 0x35C14    ; 写定大小
0045F94D   .  8B45 F0       mov     eax, dword ptr [ebp-0x10]
0045F950   .  E8 A3F0FFFF   call    <MiFareProg.sub_0045E9F8>获取运行文件大小
0045F955   .  A3 701F4700   mov     dword ptr [0x471F70], eax

对比位置

[Asm] 纯文本查看 复制代码

0045F9CB   .  A1 701F4700   mov     eax, dword ptr [0x471F70]
0045F9D0   .  3B05 6C1F4700 cmp     eax, dword ptr [0x471F6C]
0045F9D6   .  7C 1F         jl      short 0045F9F7
0045F9D8   .  8B45 FC       mov     eax, dword ptr [ebp-0x4]

这个简单直接把0x35C14改的大于脱壳文件就好了
3、CRC32校验
这个CRC校验稍微有点变化不是直接对比文件hash值而是对hash值又稍作处理
这里最好把脱壳程序拖进IDA查找加密算法因为这个是CRC，主要是一个CRC_tab,ida可以直接定位引用代码

46FF28: found const array CRC32_m_tab (used in CRC32)
Found 1 known constant arrays in total.

[Asm] 纯文本查看 复制代码

CODE:0045E287 loc_45E287:                             ; CODE XREF: sub_45E1F0+B9j
CODE:0045E287                 xor     ecx, ecx
CODE:0045E289                 mov     cl, [eax]
CODE:0045E28B                 mov     esi, [ebx]
CODE:0045E28D                 and     esi, 0FFh
CODE:0045E293                 xor     ecx, esi
CODE:0045E295                 mov     ecx, ds:CRC32_m_tab[ecx*4]；这里
CODE:0045E29C                 mov     esi, [ebx]
CODE:0045E29E                 shr     esi, 8
CODE:0045E2A1                 xor     ecx, esi
CODE:0045E2A3                 mov     [ebx], ecx
CODE:0045E2A5                 inc     eax
CODE:0045E2A6                 dec     dx
CODE:0045E2A9                 jnz     short loc_45E287
CODE:0045E2AB
CODE:0045E2AB loc_45E2AB:                             ; CODE XREF: sub_45E1F0+8Fj
CODE:0045E2AB                 cmp     [ebp+var_8], 0
CODE:0045E2AF                 jnz     short loc_45E25E
CODE:0045E2B1
CODE:0045E2B1 loc_45E2B1:                             ; CODE XREF: sub_45E1F0+6Cj

从段首可以查看在此处计算文件CRC

[Asm] 纯文本查看 复制代码

0045FB0A   .  E8 E1E6FFFF   call    <MiFareProg.sub_0045E1F0>        ;  crc
0045FB0F   .  8B45 DC       mov     eax, dword ptr [ebp-0x24]
0045FB12   .  F7D0          not     eax；取反
0045FB14   .  33D2          xor     edx, edx
0045FB16   .  52            push    edx                              ;  4AE770C6
0045FB17   .  50            push    eax

这里取反了一下计算出字符串4AE770C6导致最后比较的时候觉得不是CRC的错觉

[Asm] 纯文本查看 复制代码

0045FB47   > \A1 741F4700   mov     eax, dword ptr [0x471F74]
0045FB4C   .  8B15 781F4700 mov     edx, dword ptr [0x471F78]
0045FB52   .  E8 6D4DFAFF   call    <System.@LStrCmp>

这个软件CRC校验对比的hash在sysinf.ini中3345403435403131343F（加密的CRC）
通过函数

[Asm] 纯文本查看 复制代码

0045FAE8   .  E8 0BEBFFFF   call    <MiFareProg.sub_0045E5F8>

进行解密主要解密过程如下

[Asm] 纯文本查看 复制代码

0045E646  |> /8D45 E8       /lea     eax, dword ptr [ebp-0x18]
0045E649  |. |50            |push    eax
0045E64A  |. |8BC7          |mov     eax, edi
0045E64C  |. |2BC6          |sub     eax, esi
0045E64E  |. |40            |inc     eax
0045E64F  |. |8BD0          |mov     edx, eax
0045E651  |. |03D2          |add     edx, edx
0045E653  |. |4A            |dec     edx
0045E654  |. |B9 02000000   |mov     ecx, 0x2
0045E659  |. |8B45 FC       |mov     eax, dword ptr [ebp-0x4]
0045E65C  |. |E8 7763FAFF   |call    <System.@LStrCopy>
0045E661  |. |8B4D E8       |mov     ecx, dword ptr [ebp-0x18]
0045E664  |. |8D45 EC       |lea     eax, dword ptr [ebp-0x14]
0045E667  |. |BA DCE64500   |mov     edx, 0045E6DC                   ;  $
0045E66C  |. |E8 5361FAFF   |call    <System.@LStrCat3>
0045E671  |. |8B45 EC       |mov     eax, dword ptr [ebp-0x14]
0045E674  |. |E8 9FA0FAFF   |call    <SysUtils.StrToInt>
0045E679  |. |8BD0          |mov     edx, eax
0045E67B  |. |83F2 77       |xor     edx, 0x77
0045E67E  |. |8D45 F0       |lea     eax, dword ptr [ebp-0x10]
0045E681  |. |E8 1A60FAFF   |call    <System.@LStrFromChar>
0045E686  |. |8B55 F0       |mov     edx, dword ptr [ebp-0x10]
0045E689  |. |8D45 F4       |lea     eax, dword ptr [ebp-0xC]
0045E68C  |. |E8 EF60FAFF   |call    <System.@LStrCat>
0045E691  |. |46            |inc     esi
0045E692  |. |4B            |dec     ebx
0045E693  |.^\75 B1         \jnz     short 0045E646

其实关键就是与0x77异或
就是把3345403435403131343F看做0x3345403435403131343F，逐字节与0x77异或解密出来为

[Asm] 纯文本查看 复制代码

01D20A84  48 43 46 46 37 42 43 37 32 44                    HCFF7BC72D

然后取中间8个字符串CFF7BC72，这里只有8个字符就不用写代码了直接拿计算器把文件算出的hash：4AE770C6 加密一下写回sysinf.ini就好了我这里算出来的是33413447404032364336
大家也自己操作一下玩玩吧
也可以用peid插件修改文件CRC值为

[Asm] 纯文本查看 复制代码

not CFF7BC72

也就是3008438D，其实每处的修改方法应该都不止一种自己发挥吧
有哪里不对请拍砖

IC卡操作软件.rar (397.96 KB, 下载次数: 57) 也可以试试这个软件不同校验一样

刘统宝 · 发表于 2017-11-23 10:37

A-new 发表于 2017-11-22 18:55
都改了，并且，你脱壳后的和我脱壳修复后的可能不一样，根据自己计算出来的改

"4AE770C6 加密一下写回sysinf.ini就好了我这里算出来的是33413447404032364336"

A版的这句话含金量极高，小白请教，是怎么加密回去的呢
文科生太菜了，不好意思~

A-new · 发表于 2017-11-22 18:55

刘统宝发表于 2017-11-22 17:10
最后一段：

【这里只有8个字符就不用写代码了直接拿计算器把文件算出的hash：4AE770C6 加密一下写回sysi ...

都改了，并且，你脱壳后的和我脱壳修复后的可能不一样，根据自己计算出来的改

刘统宝 · 发表于 2017-11-20 13:41

我来了，我要第一个拜读版主大作！跟大神靠近，鸡冻~

kushua · 发表于 2017-11-20 14:01

先留名，后面再来看内容

Je11y · 发表于 2017-11-20 14:04

先留名，后面再来看内容

影风 · 发表于 2017-11-20 14:12

做个标记。稍后观看内容。。
话说为嘛大牛都是些图文教程多一点。而不是出视频教程，那不是更省力一点么

小百一个 · 发表于 2017-11-20 14:21

坐稳板凳，等待内容～～～～

牛刀小试 · 发表于 2017-11-20 14:44

努力让积分高于10000

_Spider · 发表于 2017-11-20 14:57

提示: 作者被禁止或删除内容自动屏蔽

david743 · 发表于 2017-11-20 15:00

坐板凳，稍后看内容.....

ytw6176 · 发表于 2017-11-20 15:04

后排围观来了

帐号		自动登录	找回密码
密码			注册[Register]

[原创] 一个小程序自校验分析

点评

免费评分

本帖被以下淘专辑推荐:

点评

点评

个人中心

_Spider _Spider 当前离线好友阅读权限 0 听众最后登录 1970-1-1 头像被屏蔽	_Spider 发表于 2017-11-20 14:57 提示: 作者被禁止或删除内容自动屏蔽

	回复支持举报