老板来啦--信任危机 V4.32算法深度分析 ASM注册函数

飘云 · 发表于 2010-5-1 20:28:23

【破文标题】老板来啦--信任危机 V4.32算法深度分析+ASM注册函数
【破文作者】飘云/P.Y.G
【官方主页】https://www.chinapyg.com
【作者博客】http://blog.piaoyunsoft.com
【破解平台】WinXp SP3
【破解工具】PEiD0.94、OD
【作者邮箱】[email protected]
【软件名称】老板来啦--信任危机 V4.32
【软件大小】673 K
【原版下载】http://www.skycn.com/soft/20362.html
【破解过程】

这是个2004年的老软件~~ 拿来做教程吧，有点代表性~~~ASM代码的几个函数值得收藏~~ 哈~

FSG1.3壳，脱壳过程--略

OD载入脱壳后的程序

搜索 "SOFTWARE\Microsoft\Sbackup5"

找到如下代码：

00477D0A . BA C0884700 mov edx, 004788C0 ; ASCII "SOFTWARE\Microsoft\Sbackup5"
00477D0F . A1 804E4800 mov eax, dword ptr [484E80]
00477D14 . E8 E383FEFF call 004600FC
00477D19 . 8D4D F4 lea ecx, dword ptr [ebp-C]
00477D1C . BA E4884700 mov edx, 004788E4 ; ASCII "sysback"
00477D21 . A1 804E4800 mov eax, dword ptr [484E80]
00477D26 . E8 B985FEFF call 004602E4
.
.
.
.
.
.
.
004780CF . E8 E4D7FFFF call 004758B8
004780D4 . 8B55 98 mov edx, dword ptr [ebp-68] ; 机器码
004780D7 . 8B45 F4 mov eax, dword ptr [ebp-C]
004780DA . E8 61C7F8FF call 00404840
004780DF . 0F85 87000000 jnz 0047816C
004780E5 . 8D45 94 lea eax, dword ptr [ebp-6C]
004780E8 . 50 push eax
004780E9 . 8D55 90 lea edx, dword ptr [ebp-70]
004780EC . 8B45 F4 mov eax, dword ptr [ebp-C]
004780EF . E8 9CDAFFFF call 00475B90 ; 算法CALL，F7跟进
004780F4 . 8B45 90 mov eax, dword ptr [ebp-70]
004780F7 . B9 0A000000 mov ecx, 0A ; 参数：10
004780FC . 33D2 xor edx, edx
004780FE . E8 51C8F8FF call 00404954 ; 截取前10位注册码，所以算法CALL里面的最后连接**部分是没用的
00478103 . 8B55 94 mov edx, dword ptr [ebp-6C] ; 真码
00478106 . 8B45 F0 mov eax, dword ptr [ebp-10] ; 假码
00478109 . E8 32C7F8FF call 00404840 ; 比较
0047810E . 75 5C jnz short 0047816C ; 关键跳转
{----------------------算法CALL：--------------------------}
00475B90 /$ 55 push ebp
00475B91 |. 8BEC mov ebp, esp
00475B93 |. 33C9 xor ecx, ecx
00475B95 |. 51 push ecx
00475B96 |. 51 push ecx
00475B97 |. 51 push ecx
00475B98 |. 51 push ecx
00475B99 |. 51 push ecx
00475B9A |. 51 push ecx
00475B9B |. 51 push ecx
00475B9C |. 51 push ecx
00475B9D |. 53 push ebx
00475B9E |. 56 push esi
00475B9F |. 8BF2 mov esi, edx
00475BA1 |. 8945 FC mov dword ptr [ebp-4], eax
00475BA4 |. 8B45 FC mov eax, dword ptr [ebp-4]
00475BA7 |. E8 38EDF8FF call 004048E4
00475BAC |. 33C0 xor eax, eax
00475BAE |. 55 push ebp
00475BAF |. 68 8B5D4700 push 00475D8B
00475BB4 |. 64:FF30 push dword ptr fs:[eax]
00475BB7 |. 64:8920 mov dword ptr fs:[eax], esp
00475BBA |. 8D45 F8 lea eax, dword ptr [ebp-8]
00475BBD |. E8 82E8F8FF call 00404444
00475BC2 |. 8B45 FC mov eax, dword ptr [ebp-4] ; 机器码
00475BC5 |. E8 4E2EF9FF call 00408A18 ; 机器码转换成16进制
00475BCA |. B9 1F000000 mov ecx, 1F ; ecx = 0x1F
00475BCF |. 99 cdq
00475BD0 |. F7F9 idiv ecx ; eax / ecx
00475BD2 |. 05 750E0000 add eax, 0E75 ; eax = 上面的结果 + 0x0E75
00475BD7 |. B9 03000000 mov ecx, 3 ; ecx = 3
00475BDC |. 99 cdq
00475BDD |. F7F9 idiv ecx ; eax = eax / 3
00475BDF |. 83C0 65 add eax, 65 ; 结果+0x65 保存到eax
00475BE2 |. 8D55 EC lea edx, dword ptr [ebp-14]
00475BE5 |. E8 CA2DF9FF call 004089B4 ; 转换成10进制字符串设为 X1
00475BEA |. 8B55 EC mov edx, dword ptr [ebp-14]
00475BED |. 8D45 FC lea eax, dword ptr [ebp-4]
00475BF0 |. E8 E7E8F8FF call 004044DC
00475BF5 |. 8D45 F4 lea eax, dword ptr [ebp-C]
00475BF8 |. 8B55 FC mov edx, dword ptr [ebp-4] ; X1
00475BFB |. 8A12 mov dl, byte ptr [edx] ; 第一位ASCII 设为 ASCII_X1_1
00475BFD |. E8 22EAF8FF call 00404624 ; 保存起来，下面要用到
00475C02 |. 8B45 FC mov eax, dword ptr [ebp-4]
00475C05 |. E8 F2EAF8FF call 004046FC ; X1长度
00475C0A |. 8B55 FC mov edx, dword ptr [ebp-4]
00475C0D |. 8A5402 FF mov dl, byte ptr [edx+eax-1] ; 最后一位ASCII 设为 ASCII_X1_N
00475C11 |. 8D45 F0 lea eax, dword ptr [ebp-10]
00475C14 |. E8 0BEAF8FF call 00404624 ; 保存起来，下面要用到
00475C19 |. 8B45 FC mov eax, dword ptr [ebp-4]
00475C1C |. E8 DBEAF8FF call 004046FC
00475C21 |. 83F8 08 cmp eax, 8
00475C24 |. 7E 18 jle short 00475C3E ; 长度是否小于8位，小于则跳
00475C26 |. 8D45 FC lea eax, dword ptr [ebp-4]
00475C29 |. 50 push eax
00475C2A |. B9 08000000 mov ecx, 8
00475C2F |. 33D2 xor edx, edx
00475C31 |. 8B45 FC mov eax, dword ptr [ebp-4]
00475C34 |. E8 1BEDF8FF call 00404954
00475C39 |. E9 AE000000 jmp 00475CEC
00475C3E |> 8B45 FC mov eax, dword ptr [ebp-4]
00475C41 |. E8 B6EAF8FF call 004046FC
00475C46 |. 83F8 07 cmp eax, 7 ; Switch (cases 0..7)
00475C49 |. 0F87 9D000000 ja 00475CEC
00475C4F |. FF2485 565C47>jmp dword ptr [eax*4+475C56] ; 下面是根据长度来拼接字符串~~ 最终为8位~ 设为X2
00475C56 |. DF5C4700 dd dumped_.00475CDF ; 分支表被用于 00475C4F
00475C5A |. D05C4700 dd dumped_.00475CD0
00475C5E |. C15C4700 dd dumped_.00475CC1
00475C62 |. B25C4700 dd dumped_.00475CB2
00475C66 |. A35C4700 dd dumped_.00475CA3
00475C6A |. 945C4700 dd dumped_.00475C94
00475C6E |. 855C4700 dd dumped_.00475C85
00475C72 |. 765C4700 dd dumped_.00475C76
00475C76 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 7 of switch 00475C46
00475C79 |. BA A05D4700 mov edx, 00475DA0 ; ASCII "2"
00475C7E |. E8 81EAF8FF call 00404704
00475C83 |. EB 67 jmp short 00475CEC
00475C85 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 6 of switch 00475C46
00475C88 |. BA AC5D4700 mov edx, 00475DAC ; ASCII "25"
00475C8D |. E8 72EAF8FF call 00404704
00475C92 |. EB 58 jmp short 00475CEC
00475C94 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 5 of switch 00475C46
00475C97 |. BA B85D4700 mov edx, 00475DB8 ; ASCII "232"
00475C9C |. E8 63EAF8FF call 00404704
00475CA1 |. EB 49 jmp short 00475CEC
00475CA3 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 4 of switch 00475C46
00475CA6 |. BA C45D4700 mov edx, 00475DC4 ; ASCII "4675"
00475CAB |. E8 54EAF8FF call 00404704
00475CB0 |. EB 3A jmp short 00475CEC
00475CB2 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 3 of switch 00475C46
00475CB5 |. BA D45D4700 mov edx, 00475DD4 ; ASCII "83855"
00475CBA |. E8 45EAF8FF call 00404704
00475CBF |. EB 2B jmp short 00475CEC
00475CC1 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 2 of switch 00475C46
00475CC4 |. BA E45D4700 mov edx, 00475DE4 ; ASCII "334342"
00475CC9 |. E8 36EAF8FF call 00404704
00475CCE |. EB 1C jmp short 00475CEC
00475CD0 |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 1 of switch 00475C46
00475CD3 |. BA F45D4700 mov edx, 00475DF4 ; ASCII "3447584"
00475CD8 |. E8 27EAF8FF call 00404704
00475CDD |. EB 0D jmp short 00475CEC
00475CDF |> 8D45 FC lea eax, dword ptr [ebp-4] ; Case 0 of switch 00475C46
00475CE2 |. BA 045E4700 mov edx, 00475E04 ; ASCII "47568328"
00475CE7 |. E8 18EAF8FF call 00404704
00475CEC |> BB 01000000 mov ebx, 1 ; Default case of switch 00475C46
00475CF1 |> 8D45 E4 /lea eax, dword ptr [ebp-1C]
00475CF4 8B55 FC mov edx, dword ptr [ebp-4] ; (ASCII "42074232")
00475CF7 |. 8A541A FF |mov dl, byte ptr [edx+ebx-1] ; 第i位
00475CFB |. E8 24E9F8FF |call 00404624
00475D00 |. 8B45 E4 |mov eax, dword ptr [ebp-1C]
00475D03 |. 8D55 E8 |lea edx, dword ptr [ebp-18]
00475D06 |. E8 45FCFFFF |call 00475950 ; 对X2进行查表~~ F7进入，看下
{
==========================================
00475AA0 dd FFFFFFFF
00475AA4 dd 00000001
00475AA8 ascii "1",0
00475AAA db 00
00475AAB db 00
00475AAC dd FFFFFFFF
00475AB0 dd 00000001
00475AB4 ascii "I",0
00475AB6 db 00
00475AB7 db 00
00475AB8 dd FFFFFFFF
00475ABC dd 00000001
00475AC0 ascii "2",0
00475AC2 db 00
00475AC3 db 00
00475AC4 dd FFFFFFFF
00475AC8 dd 00000001
00475ACC ascii "M",0
00475ACE db 00
00475ACF db 00
00475AD0 dd FFFFFFFF
00475AD4 dd 00000001
00475AD8 ascii "3",0
00475ADA db 00
00475ADB db 00
00475ADC dd FFFFFFFF
00475AE0 dd 00000001
00475AE4 ascii "J",0
00475AE6 db 00
00475AE7 db 00
00475AE8 dd FFFFFFFF
00475AEC dd 00000001
00475AF0 ascii "4",0
00475AF2 db 00
00475AF3 db 00
00475AF4 dd FFFFFFFF
00475AF8 dd 00000001
00475AFC ascii "S",0
00475AFE db 00
00475AFF db 00
00475B00 dd FFFFFFFF
00475B04 dd 00000001
00475B08 ascii "5",0
00475B0A db 00
00475B0B db 00
00475B0C dd FFFFFFFF
00475B10 dd 00000001
00475B14 ascii "Z",0
00475B16 db 00
00475B17 db 00
00475B18 dd FFFFFFFF
00475B1C dd 00000001
00475B20 ascii "6",0
00475B22 db 00
00475B23 db 00
00475B24 dd FFFFFFFF
00475B28 dd 00000001
00475B2C ascii "T",0
00475B2E db 00
00475B2F db 00
00475B30 dd FFFFFFFF
00475B34 dd 00000001
00475B38 ascii "7",0
00475B3A db 00
00475B3B db 00
00475B3C dd FFFFFFFF
00475B40 dd 00000001
00475B44 ascii "X",0
00475B46 db 00
00475B47 db 00
00475B48 dd FFFFFFFF
00475B4C dd 00000001
00475B50 ascii "8",0
00475B52 db 00
00475B53 db 00
00475B54 dd FFFFFFFF
00475B58 dd 00000001
00475B5C ascii "K",0
00475B5E db 00
00475B5F db 00
00475B60 dd FFFFFFFF
00475B64 dd 00000001
00475B68 ascii "9",0
00475B6A db 00
00475B6B db 00
00475B6C dd FFFFFFFF
00475B70 dd 00000001
00475B74 ascii "L",0
00475B76 db 00
00475B77 db 00
00475B78 dd FFFFFFFF
00475B7C dd 00000001
00475B80 ascii "0",0
00475B82 db 00
00475B83 db 00
00475B84 dd FFFFFFFF
00475B88 dd 00000001
00475B8C ascii "B",0
==========================================
整理之后得到：
0123456789
BIMJSZTXKL
==========================================
}
00475D0B |. 8B55 E8 |mov edx, dword ptr [ebp-18]
00475D0E |. 8D45 F8 |lea eax, dword ptr [ebp-8]
00475D11 |. E8 EEE9F8FF |call 00404704
00475D16 |. 43 |inc ebx
00475D17 |. 83FB 09 |cmp ebx, 9
00475D1A |.^ 75 D5 \jnz short 00475CF1 ; 循环完成的结果设为X3
00475D1C |. 8D55 F8 lea edx, dword ptr [ebp-8]
00475D1F |. B9 03000000 mov ecx, 3
00475D24 |. 8B45 F4 mov eax, dword ptr [ebp-C] ; 参数A = ASCII_X1_1
00475D27 |. E8 B0ECF8FF call 004049DC ; 在X3第3位插入参数A 设为X4
00475D2C |. 8D55 F8 lea edx, dword ptr [ebp-8]
00475D2F |. B9 07000000 mov ecx, 7
00475D34 8B45 F0 mov eax, dword ptr [ebp-10] ; 参数B = ASCII_X1_N
00475D37 |. E8 A0ECF8FF call 004049DC ; 在X4第7位插入参数B 设为SN
00475D3C |. FF75 F8 push dword ptr [ebp-8] ; 这里出来之后就是10位注册码了~
00475D3F |. B8 E8030000 mov eax, 3E8
00475D44 |. E8 23D2F8FF call 00402F6C ; 下面几个CALL计算和连接**字符串，因为考虑 ASCII_X1_1 和 ASCII_X1_N 为空的情况~~ 导致
注册码为8位~~
00475D49 |. 8D55 E0 lea edx, dword ptr [ebp-20] ; 我仔细分析了下，不会出现为空的情况，所以下面的连接部分忽略不计~
00475D4C |. E8 632CF9FF call 004089B4
00475D51 |. FF75 E0 push dword ptr [ebp-20]
00475D54 |. 68 185E4700 push 00475E18 ; ASCII "**"
00475D59 |. 8D45 F8 lea eax, dword ptr [ebp-8]
00475D5C |. BA 03000000 mov edx, 3
00475D61 |. E8 56EAF8FF call 004047BC
00475D66 |. 8BC6 mov eax, esi
00475D68 |. 8B55 F8 mov edx, dword ptr [ebp-8]
00475D6B |. E8 28E7F8FF call 00404498
00475D70 |. 33C0 xor eax, eax
00475D72 |. 5A pop edx
00475D73 |. 59 pop ecx
00475D74 |. 59 pop ecx
00475D75 |. 64:8910 mov dword ptr fs:[eax], edx
00475D78 |. 68 925D4700 push 00475D92
00475D7D |> 8D45 E0 lea eax, dword ptr [ebp-20]
00475D80 |. BA 08000000 mov edx, 8
00475D85 |. E8 DEE6F8FF call 00404468
00475D8A \. C3 retn
00475D8B .^ E9 58E0F8FF jmp 00403DE8
00475D90 .^ EB EB jmp short 00475D7D
00475D92 . 5E pop esi
00475D93 . 5B pop ebx
00475D94 . 8BE5 mov esp, ebp
00475D96 . 5D pop ebp
00475D97 . C3 retn

复制代码

【算法总结】
1.eax = 16进制(机器码) / 0x1F
2.eax = eax + 0x0E75
3.eax = eax / 3
4.eax = eax + 0x65
5.X1 = 10进制(eax)
6.ASCII_X1_1 = X1[1]
7.ASCII_X1_N = X1[N]
8.Len(X1)=8位则用原来的数据 Len(X1)<8 则补充长度为8位~
  分别为：
====================
7位: + "2"
6位: + "25"
5位: + "232"
4位: + "4675"
3位: + "83855"
2位: + "334342"
1位: + "3447584"
0位: + "47568328"
====================

补充之后的数据为X2
9.对X2逐位查表：
0123456789
BIMJSZTXKL
10.在X3第3位插入参数ASCII_X1_1(字符)
11.在X4第7位插入参数ASCII_X1_N((字符)
12.截取步骤11的前10位即为注册码

【注册函数】
;字符串操作宏
T MACRO text
      local @lbl
      .const
            @lbl db text,0
      .code
      exitm <offset @lbl>
ENDM

.data
;密码表
szConstTable             db             'BIMJSZTXKL',0
szFormatOct                      db             '%d',0

.code

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;函数功能：将字符串转换成数值
;Code By PiaoYun/P.Y.G
;http://blog.piaoyunsoft.com
;说明：仅做转换用，没有判断传入字符串的合法性~~  如 "1111" --> 1111
;
;函数参数：
;  lpszStr：指针，传入字符串的地址
;返回值：16进制数值
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
_ProcStrToDword proc lpszStr:dword
      mov       esi,lpszStr
      xor  eax, eax
      xor  ebx, ebx

@@:
      mov  bl, byte ptr [esi]
      test bl, bl
      je       @F
      sub  bl, 30h
      lea  eax, dword ptr [eax+eax*4]
      add  eax, eax
      add  eax, ebx
      inc  esi
      jmp       @B
@@:
      ret
_ProcStrToDword endp

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;函数功能：在字符串中指定位置插入字符
;Code By PiaoYun/P.Y.G
;http://blog.piaoyunsoft.com
;函数参数：
;  lpszStr：指针，待插入字符的字符串地址
;  lpChar：指针，要插入的字符地址
;  wPos:　　插入的位置
;返回值：没有
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
_InsertChar  proc  lpszStr:DWORD,lpChar:DWORD,wPos:DWORD
  local  @szInStr[32]:BYTE
  mov  edi,lpszStr
  mov  esi,lpChar
  mov  edx,wPos
  dec  edx
  mov  ecx,edx
  add  edx,edi
  add  edi,ecx
  invoke  lstrcpy, addr @szInStr,edx
  mov  bl,BYTE ptr [esi]
  mov  BYTE ptr [edi],bl
  mov  BYTE ptr [edi+1],0
  invoke  lstrcat,edi,addr @szInStr
  ret
_InsertChar  endp

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;函数功能：注册算法总户数
;Code By PiaoYun/P.Y.G
;http://blog.piaoyunsoft.com
;函数参数：
;  lpID：       指针，传入机器码地址
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
KeyGen       proc       uses ecx edx lpID:DWORD

      LOCAL       @szKey[256]:byte

      invoke       RtlZeroMemory,addr @szKey,sizeof @szKey

      xor             ecx,ecx
      xor             edx,edx

      ;机器码转换成数值
      invoke       _ProcStrToDword,lpID

      mov    ecx, 1Fh
      cdq
      idiv ecx
      add    eax, 0E75h
      mov    ecx, 3h
      cdq
      idiv ecx
      add    eax, 65h

      ;上面累加结果转成字符串
      invoke wsprintf,addr @szKey,addr szFormatOct,eax
      ;获取字符串长度
      invoke lstrlen,addr @szKey

      ;第一位字符
      mov             dl,byte ptr [@szKey]
      mov             [@szKey+100],dl

      ;最后一位字符
      mov             dl,byte ptr [@szKey + eax -1]
      mov             [@szKey+101],dl

      .if eax <= 8
            .if       eax == 6
                     invoke       lstrcat,addr @szKey,T("2")
                     .elseif       eax == 6
                              invoke       lstrcat,addr @szKey,T("25")
                     .elseif       eax == 5
                              invoke       lstrcat,addr @szKey,T("232")
                     .elseif       eax == 4
                              invoke       lstrcat,addr @szKey,T("4675")
                     .elseif       eax == 3
                              invoke       lstrcat,addr @szKey,T("83855")
                     .elseif       eax == 2
                              invoke       lstrcat,addr @szKey,T("334342")
                     .elseif       eax == 1
                              invoke       lstrcat,addr @szKey,T("3447584")
                     .elseif       eax == 0
                              invoke       lstrcat,addr @szKey,T("47568328")
            .endif
      ;如果大于8位,则截断后面的
      .elseif
            mov       byte ptr[@szKey + 8],0
      .endif


            xor             ebx,ebx
      @@:
            movzx edx,byte ptr [@szKey+ebx]
            sub       edx,30h
            movzx       edx,byte ptr [szConstTable+edx]
            mov             byte ptr[@szKey + ebx],dl
            inc             ebx
            cmp             ebx,8
            jnz             @B

      invoke  _InsertChar,addr @szKey,addr [@szKey+100],3
      invoke  _InsertChar,addr @szKey,addr [@szKey+101],7


      ;取前十位作为注册码(这句可省略)
      ;mov       byte ptr[@szKey + 10],0

      ;插入分隔符
      invoke  _InsertChar,addr @szKey,T("-"),6

      lea             eax,@szKey
      ret

KeyGen endp
【版权声明】本文纯属技术交流, 原创于PYG官方论坛, 转载请注明作者并保持文章的完整, 谢谢!

月之精灵 · 发表于 2010-5-1 22:04:44

第一个来学习

sjh717142 · 发表于 2010-5-2 00:04:31

刚用了LZ的PYG.dll
Thanks

GGLHY · 发表于 2010-5-2 10:14:40

前来学习！
膜拜下！

老万 · 发表于 2010-5-2 22:05:12

学习了，谢谢飘云老大

gerald2008 · 发表于 2010-5-11 08:48:22

学习了，谢谢！

kelvar · 发表于 2010-5-19 20:01:43

多谢分享。发现PYG用FireFox登录的时候回复总是有验证码，并且怎么输入都不对。郁闷

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