Enigma Protector脱壳

幽雅的心 · 发表于 2011-9-27 00:18:56

【文章标题】: Enigma Protector脱壳
【文章作者】: Smoke
【编写语言】: delphi7
【操作平台】: windows xp sp3
【作者声明】: 只是感兴趣，没有其他目的。失误之处敬请诸位大侠赐教!
--------------------------------------------------------------------------------
【详细过程】
  Enigma Protector脱壳
  OllyDBG插件 PhantOm
  勾住protect DRx 选项来方便下断点
  设置完毕后重新载入OllyDBG
0041A3DA >  55             push ebp
  0041A3DB 8BEC          mov    ebp, esp
  0041A3DD 83C4 F0       add    esp, -10
  0041A3E0 B8 00104000    mov    eax, 00401000
  0041A3E5 E8 01000000    call 0041A3EB
  0041A3EA 9A 83C4108B E55>call far 5DE5:8B10C483
  0041A3F1  - E9 A2910900    jmp    004B3598
  0041A3F6  ^ E0 D9          loopdne short 0041A3D1
用二次断点
Ctrl+G 输入 VirtualAlloc
7C809AE1 > 8BFF mov edi, edi
7C809AE3 55 push ebp
7C809AE4 8BEC mov ebp, esp
7C809AE6 FF75 14 push dword ptr [ebp+14]
7C809AE9 FF75 10 push dword ptr [ebp+10]
7C809AEC FF75 0C push dword ptr [ebp+C]
7C809AEF FF75 08 push dword ptr [ebp+8]
7C809AF2 6A FF push -1
7C809AF4 E8 09000000 call VirtualAllocEx //F2下断 F9运行断下之后在到数据窗口到401000 处下硬件写入断点找解码处
7C809AF9 5D pop ebp

下面应该就是解码过程了
005502AF FC cld
005502B0 B2 80 mov dl, 80
005502B2 8A06 mov al, byte ptr [esi]
005502B4 46 inc esi
005502B5 8807 mov byte ptr [edi], al
005502B7 47 inc edi ; UnpackMe.00401000
005502B8 00D2 add dl, dl
005502BA 75 05 jnz short 005502C1
005502BC 8A16 mov dl, byte ptr [esi]
005502BE 46 inc esi
005502BF 10D2 adc dl, dl
005502C1 ^ 73 EF jnb short 005502B2

往下拉来到
005503C8 F3:A4 rep movs byte ptr es:[edi], byte ptr>
005503CA 5E pop esi
005503CB ^ E9 E8FEFFFF jmp 005502B8
005503D0 5D pop ebp
005503D1 2B7D 40 sub edi, dword ptr [ebp+40]
005503D4 897C24 1C mov dword ptr [esp+1C], edi
005503D8 61 popad
005503D9 5D pop ebp
005503DA C3 retn //F2下断 F9运行发现数据窗口已经解码完了

接下来就来找OEP
跟随到00401000 搜索特征码 A3??????00A1??????00A3??????0033C0A3??????0033C0A3??????00 (delphi程序的第一个call)
来到以下地方
00405BC8 53 push ebx 第一个call
00405BC9 8BD8 mov ebx, eax
00405BCB 33C0 xor eax, eax
00405BCD A3 9CD04400 mov dword ptr [44D09C], eax
00405BD2 6A 00 push 0
00405BD4 E8 FF4A0000 call 0040A6D8 第一个函数
00405BD9 A3 64F64400 mov dword ptr [44F664], eax
00405BDE A1 64F64400 mov eax, dword ptr [44F664]
00405BE3 A3 A8D04400 mov dword ptr [44D0A8], eax
00405BE8 33C0 xor eax, eax
00405BEA A3 ACD04400 mov dword ptr [44D0AC], eax
00405BEF 33C0 xor eax, eax
00405BF1 A3 B0D04400 mov dword ptr [44D0B0], eax

ALT+M在
Memory map, 条目 22
地址=00401000
大小=0004C000 (311296.)
属主=UnpackMe 00400000
区段=
包含=SFX,代码
类型=Imag 01001002
访问=R
初始访问=RWE
下内存写入断点 F9运行
删除内存断点来到

0055026B 294C0F 01 sub dword ptr [edi+ecx+1], ecx
0055026F 83C1 05 add ecx, 5
00550272 83E8 04 sub eax, 4
00550275 ^ EB D7 jmp short 0055024E
00550277 29540F 02 sub dword ptr [edi+ecx+2], edx
0055027B 83C1 06 add ecx, 6
0055027E 83EA 04 sub edx, 4
00550281 83E8 05 sub eax, 5
00550284 ^ EB C8 jmp short 0055024E
00550286 61 popad
00550287 5D pop ebp
00550288 C2 0800 retn 8
0055028B 90 nop

00550281 83E8 05 sub eax, 5
00550284 ^ EB C8 jmp short 0055024E
00550286 61 popad
00550287 5D pop ebp
00550288 C2 0800 retn 8 //F2下断 F9运行

继续来到
00405BC8 53 push ebx
00405BC9 8BD8 mov ebx, eax
00405BCB 33C0 xor eax, eax
00405BCD A3 9CD04400 mov dword ptr [44D09C], eax
00405BD2 6A 00 push 0
00405BD4 E8 2BFFFFFF call 00405B04 //F7跟进
00405BD9 A3 64F64400 mov dword ptr [44F664], eax
00405BDE A1 64F64400 mov eax, dword ptr [44F664]
00405BE3 A3 A8D04400 mov dword ptr [44D0A8], eax

来到
00405B04 FF25 E4014500 jmp dword ptr [4501E4]
00405B0A 8BC0 mov eax, eax
00405B0C FF25 E0014500 jmp dword ptr [4501E0]
00405B12 8BC0 mov eax, eax
00405B14 FF25 DC014500 jmp dword ptr [4501DC]
00405B1A 8BC0 mov eax, eax
00405B1C FF25 D8014500 jmp dword ptr [4501D8]
发现已经解密完毕不再是开始那样

返回EIP
搜索特征码 ctrl+F
mov dword ptr ds:[edx+eax*4+4],ecx
把找到的特征码全部下硬件执行断点
搜索完及下完硬件点段后直接F9
把找到的地方nop掉
0054C9EA 90 nop
0054C9EB 90 nop
0054C9EC 90 nop
0054C9ED 90 nop

删掉0054C9EA硬件执行断点

0054C9F8 33C0 xor eax, eax //F2下断 F9运行
0054C9FA 5A pop edx
0054C9FB 59 pop ecx
0054C9FC 59 pop ecx
撤消0054C9EA修改后的代码并下硬件执行断点

来到OEP发现有些函数已经解密了
重新载入OllyDBG
硬件执行断点都在
F9运行来到

0054C9EA 894C82 04 mov dword ptr [edx+eax*4+4], ecx
0054C9EE 47 inc edi
0054C9EF FF4D D0 dec dword ptr [ebp-30]
先nop填充掉
0054C9EA 90 nop
0054C9EB 90 nop
0054C9EC 90 nop
0054C9ED 90 nop

删除硬件断点
0054C9F8 33C0          xor    eax, eax  //F2下断 F9运行
在0054C9F8断下后撤销0054C9EA修改后的代码重新下硬件执行断点再F9
来到

0054BDBD 894C82 04 mov dword ptr [edx+eax*4+4], ecx ; UnpackMe.0054E204
0054BDC1 83C3 04 add ebx, 4
0054BDC4 66:8B3B mov di, word ptr [ebx]
nop掉
0054BDBD 90 nop
0054BDBE 90 nop
0054BDBF 90 nop
0054BDC0 90 nop

删除硬件断点 0054BDBD
往下拉来到
0054BE30 83F8 FF cmp eax, -1
0054BE33 ^ 0F85 24FDFFFF jnz 0054BB5D
0054BE39 33C0 xor eax, eax //F2下断 F9运行
0054BE3B 5A pop edx

断下之后取消断点撤销修改的地方0054BDBD 并下硬件执行断点再F9
来到
0054C9EA 894C82 04 mov dword ptr [edx+eax*4+4], ecx

继续重复上一次操作
取消掉硬件执行断点 004EF086  0054BC97
跟随到00405BC8 下个硬件执行断点 F9运行
来到

00405BC8 53 push ebx
00405BC9 8BD8 mov ebx, eax
00405BCB 33C0 xor eax, eax
00405BCD A3 9CD04400 mov dword ptr [44D09C], eax
00405BD2 6A 00 push 0
00405BD4 E8 2BFFFFFF call 00405B04 ; jmp 到 kernel32.GetModuleHandleA //F7跟进
00405BD9 A3 64F64400 mov dword ptr [44F664], eax
00405BDE A1 64F64400 mov eax, dword ptr [44F664]

00405AD6 /EB 20 jmp short 00405AF8
00405AD8 |E8 9FB7FFFF call 0040127C ; jmp 到 kernel32.GetThreadLocale
00405ADD |E8 86FEFFFF call 00405968
00405AE2 |A3 BCF54400 mov dword ptr [44F5BC], eax
00405AE7 |EB 0F jmp short 00405AF8
00405AE9 |E8 8EB7FFFF call 0040127C ; jmp 到 kernel32.GetThreadLocale
00405AEE |E8 75FEFFFF call 00405968
00405AF3 |A3 BCF54400 mov dword ptr [44F5BC], eax
00405AF8 \E8 FFB7FFFF call 004012FC ; jmp 到 kernel32.GetCurrentThreadId
00405AFD A3 30F04400 mov dword ptr [44F030], eax
00405B02 C3 retn
00405B03 90 nop
00405B04 - FF25 646FC600 jmp dword ptr [C66F64] ; kernel32.GetModuleHandleA
00405B0A 8BC0 mov eax, eax
00405B0C - FF25 586FC600 jmp dword ptr [C66F58] ; kernel32.LocalAlloc
00405B12 8BC0 mov eax, eax
00405B14 - FF25 4C6FC600 jmp dword ptr [C66F4C] ; kernel32.TlsGetValue
00405B1A 8BC0 mov eax, eax
00405B1C - FF25 406FC600 jmp dword ptr [C66F40] ; kernel32.TlsSetValue
看到函数已经解密了

CPU窗口跟随到00C37CA0
来到

00C37C86 0000 add byte ptr [eax], al
00C37C88 0000 add byte ptr [eax], al
00C37C8A 0000 add byte ptr [eax], al
00C37C8C BA 00000055 mov edx, 55000000
00C37C91 8BEC mov ebp, esp
00C37C93 83C4 F0 add esp, -10
00C37C96 B8 B8C84400 mov eax, 44C8B8
00C37C9B E8 28DF7CFF call UnpackMe.00405BC8
00C37CA0 8B05 B8DF4400 mov eax, dword ptr [44DFB8] ; UnpackMe.0044FBB0
00C37CA6 8B40 00 mov eax, dword ptr [eax]
00C37CA9 E8 A23481FF call UnpackMe.0044B150
00C37CAE 8B0D 94E04400 mov ecx, dword ptr [44E094] ; UnpackMe.0044FBD0
00C37C8C BA 00000055 mov edx, 55000000 //nop掉
00C37C90 90 nop //撤销修改代码

复制保存
push ebp
mov ebp, esp
add esp, -10
mov eax, 44C8B8
call UnpackMe.00405BC8
mov eax, dword ptr [44DFB8]
mov eax, dword ptr [eax]
call UnpackMe.0044B150
mov ecx, dword ptr [44E094]
mov eax, dword ptr [44DFB8]
mov eax, dword ptr [eax]
mov edx, dword ptr [44C6F0]
call UnpackMe.0044B168
mov eax, dword ptr [44DFB8]
mov eax, dword ptr [eax]
call UnpackMe.0044B1E8
call UnpackMe.00403D20
lea eax, dword ptr [eax]

返回到eip
00405BC8 53 push ebx
00405BC9 8BD8 mov ebx, eax
00405BCB 33C0 xor eax, eax
00405BCD A3 9CD04400 mov dword ptr [44D09C], eax
00405BD2 6A 00 push 0
00405BD4 E8 2BFFFFFF call 00405B04 ; jmp 到 kernel32.GetModuleHandleA
00405BD9 A3 64F64400 mov dword ptr [44F664], eax
00405BDE A1 64F64400 mov eax, dword ptr [44F664]

搜索 558BEC33C05568??????0064FF3064892033C05A595964891068??????00C3E9 (OEP特征码)
来到

0044C890 55 push ebp
0044C891 8BEC mov ebp, esp
0044C893 33C0 xor eax, eax
0044C895 55 push ebp
0044C896 68 AFC84400 push 0044C8AF
0044C89B 64:FF30 push dword ptr fs:[eax]
0044C89E 64:8920 mov dword ptr fs:[eax], esp
继续搜索90C84400
0044CA93 90 nop
0044CA94 90 nop
0044CA95 90 nop
0044CA96 90 nop
0044CA97 90 nop
0044CA98 51 push ecx //新建EIP
0044CA99 06 push es
0044CA9A 7A 12 jpe short 0044CAAE
0044CA9C 5C pop esp
0044CA9D 42 inc edx
复制刚才保存的代码
push ebp
mov ebp, esp
add esp, -10
mov eax, 44C8B8
call UnpackMe.00405BC8
mov eax, dword ptr [44DFB8]
mov eax, dword ptr [eax]
call UnpackMe.0044B150
mov ecx, dword ptr [44E094]
mov eax, dword ptr [44DFB8]
mov eax, dword ptr [eax]
mov edx, dword ptr [44C6F0]
call UnpackMe.0044B168
mov eax, dword ptr [44DFB8]
mov eax, dword ptr [eax]
call UnpackMe.0044B1E8
call UnpackMe.00403D20
lea eax, dword ptr [eax]
粘贴完毕后为
0044CA98 55 push ebp
0044CA99 8BEC mov ebp, esp
0044CA9B 83C4 F0 add esp, -10
0044CA9E B8 B8C84400 mov eax, 0044C8B8
0044CAA3 E8 2091FBFF call 00405BC8
0044CAA8 A1 B8DF4400 mov eax, dword ptr [44DFB8]
0044CAAD 8B00 mov eax, dword ptr [eax]
0044CAAF E8 9CE6FFFF call 0044B150
0044CAB4 8B0D 94E04400 mov ecx, dword ptr [44E094] ; UnpackMe.0044FBD0
0044CABA A1 B8DF4400 mov eax, dword ptr [44DFB8]
0044CABF 8B00 mov eax, dword ptr [eax]
0044CAC1 8B15 F0C64400 mov edx, dword ptr [44C6F0] ; UnpackMe.0044C73C
0044CAC7 E8 9CE6FFFF call 0044B168
0044CACC A1 B8DF4400 mov eax, dword ptr [44DFB8]
0044CAD1 8B00 mov eax, dword ptr [eax]
0044CAD3 E8 10E7FFFF call 0044B1E8
0044CAD8 E8 4372FBFF call 00403D20
0044CADD 8D00 lea eax, dword ptr [eax]
0044CADF 90 nop

然后即可DUMP
使用LordPE 选取进程修正镜像大小完整转存
再ImportREC 选取进程 oep为 4CA98 RVA为85AEA0 大小为2050
剪切到无效指针修复转存
脱壳后为Borland Delphi 6.0 - 7.0
正常运行!
--------------------------------------------------------------------------------
【版权声明】: 本文原创于Smoke, 转载请注明作者并保持文章的完整, 谢谢!

ghc00259 · 发表于 2012-1-30 09:23:33

能上个视频看就不用看那么长~\(≧▽≦)/~啦啦啦

guols · 发表于 2015-1-7 15:40:30

要有配合楼主能把视频搞出来的的话，就更完美了

read4011 · 发表于 2015-7-21 09:03:30

不错，学习下

MFS2015 · 发表于 2015-7-24 11:28:43

不错，学习下

guols · 发表于 2015-8-31 22:31:33

要是能做出视频教程来有多好啊，大神

silipeng · 发表于 2015-11-15 07:35:41

学习了，谢谢分享

fmjp1 · 发表于 2015-11-17 13:49:13

帮我破一个把

ericchang999 · 发表于 2018-8-15 11:22:18

跟看天书一样!!!大神的世界,小白不懂!!!!

踏雪 · 发表于 2019-5-29 17:25:00

能帮我脱个壳不 4.0的付费

		自动登录	找回密码
密码			加入我们

[原创] Enigma Protector脱壳

相关帖子