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用OllyDbg配合ollyDump手动脱壳

时间:2004/10/15 0:58:00来源:本站整理作者:蓝点我要评论(0)

 工具:ollydbg1.09B,插件ollyDump V2.11.108

基本操作:F8-单步执行,遇到call不进入。F7-单步执行,遇到call进入。F4-执行到光标所在行。F2-设断
手动脱壳要把握两点:
1、单步往前走,不要回头。
2、观察。注意poshad、poshfd,popad、popfd等,注意地址发生大的变化。

程序用PECompact V1.40-45加的壳,没见过的,在这里只好手动脱壳。

0054DC00 > /EB 06           JMP SHORT wb86.0054DC08
0054DC02   |68 84370000     PUSH 3784
0054DC07   |C3              RETN
0054DC08   \9C              PUSHFD
0054DC09    60              PUSHAD
0054DC0A    E8 02000000     CALL wb86.0054DC11  =>单步走到这里,F8过的话程序就运行,所以要F7跟入

-------------------------------------------------------------------------------
0054DC11    8BC4            MOV EAX,ESP    =>F7后来到这,继续单步运行
0054DC13    83C0 04         ADD EAX,4
0054DC16    93              XCHG EAX,EBX
0054DC17    8BE3            MOV ESP,EBX
0054DC19    8B5B FC         MOV EBX,DWORD PTR DS:[EBX-4]
0054DC1C    81EB 0FA04000   SUB EBX,wb86.0040A00F
0054DC22    87DD            XCHG EBP,EBX
0054DC24    8B85 A6A04000   MOV EAX,DWORD PTR SS:[EBP+40A0A6]
0054DC2A    0185 03A04000   ADD DWORD PTR SS:[EBP+40A003],EAX
0054DC30    66:C785 00A0400>MOV WORD PTR SS:[EBP+40A000],9090
0054DC39    0185 9EA04000   ADD DWORD PTR SS:[EBP+40A09E],EAX
0054DC3F    BB C3110000     MOV EBX,11C3
0054DC44    039D AAA04000   ADD EBX,DWORD PTR SS:[EBP+40A0AA]
0054DC4A    039D A6A04000   ADD EBX,DWORD PTR SS:[EBP+40A0A6]
0054DC50    53              PUSH EBX
0054DC51    53              PUSH EBX

...............(一直往前走,省略).....................

0054F25E    57              PUSH EDI
0054F25F    AD              LODS DWORD PTR DS:[ESI]
0054F260    0BC0            OR EAX,EAX
0054F262    74 6C           JE SHORT wb86.0054F2D0
0054F264    8BD0            MOV EDX,EAX
0054F266    0395 A6A04000   ADD EDX,DWORD PTR SS:[EBP+40A0A6]
0054F26C    AD              LODS DWORD PTR DS:[ESI]
0054F26D    56              PUSH ESI
0054F26E    8BC8            MOV ECX,EAX
0054F270    57              PUSH EDI
0054F271    52              PUSH EDX
0054F272    8BF2            MOV ESI,EDX
0054F274    8B85 15A64000   MOV EAX,DWORD PTR SS:[EBP+40A615]
0054F27A    8B9D 19A64000   MOV EBX,DWORD PTR SS:[EBP+40A619]
0054F280    E8 910A0000     CALL wb86.0054FD16
0054F285    5A              POP EDX
0054F286    5F              POP EDI
0054F287    52              PUSH EDX
0054F288    57              PUSH EDI
0054F289    FF95 9EA04000   CALL DWORD PTR SS:[EBP+40A09E]
0054F28F    0BC0            OR EAX,EAX
0054F291    74 07           JE SHORT wb86.0054F29A
0054F293    8BC8            MOV ECX,EAX
0054F295    5E              POP ESI
0054F296    5F              POP EDI
0054F297  ^ EB C5           JMP SHORT wb86.0054F25E  ==>走到这里会跳到前面,把光标移动到下一

行,F4跳过时程序会直接运行,所以还得单步运行,走到上面的0054F262处会跳到后面去了
0054F299    B9 8D9D97A5     MOV ECX,A5979D8D
0054F29E    40              INC EAX
0054F29F    0053 FF         ADD BYTE PTR DS:[EBX-1],DL
0054F2A2    95              XCHG EAX,EBP
0054F2A3    15 A640008D     ADC EAX,8D0040A6
0054F2A8    9D              POPFD

...............(一直往前走,省略).....................

0054F2CF    24 58           AND AL,58  ==>从上面跳到这,继续单步走
0054F2D1    8DB5 C3A64000   LEA ESI,DWORD PTR SS:[EBP+40A6C3]
0054F2D7    AD              LODS DWORD PTR DS:[ESI]
0054F2D8    0BC0            OR EAX,EAX
0054F2DA    74 74           JE SHORT wb86.0054F350
0054F2DC    0385 A6A04000   ADD EAX,DWORD PTR SS:[EBP+40A0A6]

...............(一直往前走,省略).....................

0054F36E   /74 72           JE SHORT wb86.0054F3E2   
0054F36D    49              DEC ECX
0054F36E    74 72           JE SHORT wb86.0054F3E2
0054F370    78 70           JS SHORT wb86.0054F3E2
0054F372    66:8B07         MOV AX,WORD PTR DS:[EDI]
0054F375    2C E8           SUB AL,0E8
0054F377    3C 01           CMP AL,1
0054F379    76 38           JBE SHORT wb86.0054F3B3
0054F37B    66:3D 1725      CMP AX,2517
0054F37F    74 51           JE SHORT wb86.0054F3D2
0054F381    3C 27           CMP AL,27
0054F383    75 0A           JNZ SHORT wb86.0054F38F
0054F385    80FC 80         CMP AH,80
0054F388    72 05           JB SHORT wb86.0054F38F
0054F38A    80FC 8F         CMP AH,8F
0054F38D    76 05           JBE SHORT wb86.0054F394
0054F38F    47              INC EDI
0054F390    43              INC EBX
0054F391  ^ EB DA           JMP SHORT wb86.0054F36D ==>这里又跳到前面,看一下前面那一句会跳到

后面的,是JE SHORT 0054F3E2,JS SHORT 0054F3E2,JBE SHORT wb86.0054F3B3,JE SHORT 0054F3D2,依次

在其跳往的地方设断。F9运行,会在设断的地方停,最后确定0054F3E2才是正确的设断地方
0054F393    B8 8B47023C     MOV EAX,3C02478B

...............(一直往前走,省略).....................

0054F476    8BB5 15A64000    MOV ESI,DWORD PTR SS:[EBP+40A615]
0054F47C    8BBD 19A64000    MOV EDI,DWORD PTR SS:[EBP+40A619]
0054F482    E8 8F0C0000      CALL wb86.00550116
0054F487    61               POPAD   ==>看到希望了,继续单步走
0054F488    9D               POPFD  
0054F489    50               PUSH EAX
0054F48A    68 84374000      PUSH wb86.00403784
0054F48F    C2 0400          RETN 4 ==>走过这里,地址会有很大变化,可以确定,壳已脱完了。
0054F492    8BB5 37A64000    MOV ESI,DWORD PTR SS:[EBP+40A637]

00403781      00             DB 00
00403782   >  0000           ADD BYTE PTR DS:[EAX],AL
00403784   .  68 94FF4300    PUSH wb86.0043FF94  ===>由0054F48F处跳来,在这里运行ollyDump把

程序dump下来。到此手动脱壳结束。
00403789      E8             DB E8
0040378A      EE             DB EE
0040378B      FF             DB FF
0040378C      FF             DB FF
0040378D      FF             DB FF
0040378E      00             DB 00
0040378F      00             DB 00
00403790      00             DB 00
00403791      00             DB 00
00403792      00             DB 00

脱完后可以用侦壳工具看,是用VB写的。其它壳(如Aspack等)都可以用此法配合OLLYDUMP来手动脱壳
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