本人小菜..水平有限...
分析不对的地方,请指出..各位大侠..
t_elcok..用seh..太多...贯穿了整个壳..还有,起始和末尾的seh..几乎是一样..
希望和大家一起进步...脱壳,不是太难..但IAT虽然可以用脚本..但是...人工跟踪,该用什么方式?这个想不明白..
希望高手指点
0042DBC4 E8 00000000 call 0042DBC9
0042DBC9 812C24 37020000 sub dword ptr [esp], 237
0042DBD0 ^ FF6424 04 jmp dword ptr [esp+4] ; 下面一个跳，只是解码。。没什么用，返回到这个跳
0042DBD4 0000 add byte ptr [eax], al
0042DBD6 >^ E9 25E4FFFF jmp 0042C000 ; 起始，没什么作用
JMP代码太多..但没有意义，只是为下面解码
0042C037 D4 09 aam 9
0042C039 49 dec ecx
0042C03A ^ 7F E9 jg short 0042C025
0042C03C 67:E3 02 jcxz short 0042C041 ; 这里解码。。直接F4
然后到这个seh..自己设置，内存异常，但没什么作用..只是42D9F7,继续程序
0042D9F1 60 pushad
0042D9F2 E8 06000000 call 0042D9FD
0042D9F7 8B6424 08 mov esp, dword ptr [esp+8]
0042D9FB EB 0D jmp short 0042DA0A
0042D9FD 2BC9 sub ecx, ecx
0042D9FF 64:FF31 push dword ptr fs:[ecx]
0042DA02 64:8921 mov dword ptr fs:[ecx], esp
0042DA05 F1 int1
0042DA06 FF01 inc dword ptr [ecx] ; 这个seh貌似没干什么，就是让程序往下走
解除seh
0042DA2C 33C9 xor ecx, ecx ; wuliao11.0042D9F7
0042DA2E 64:8F01 pop dword ptr fs:[ecx]
0042DA31 59 pop ecx ; 这里解除了seh
这个seh..结束这后,会来到这里..这里貌似有暗桩..如果这里单步的话
0042DA3B 60 pushad
0042DA3C E8 06000000 call 0042DA47
0042DA41 8B6424 08 mov esp, dword ptr [esp+8] ; seh..处理点42DA41
0042DA45 EB 1A jmp short 0042DA61 ;F4的话,接下程序直接out
0042DA47 64:67:FF36 0000 push dword ptr fs:[0]
0042DA4D 64:67:8926 0000 mov dword ptr fs:[0], esp
0042DA53 9C pushfd
0042DA54 810C24 00010000 or dword ptr [esp], 100
0042DA5B 9D popfd
0042DA5C F8 clc
0042DA5D ^ 73 DC jnb short 0042DA3B ;具体为什么造成这种原因,我太不懂..seh.希望哪个大侠指点下
我是通过..在下面
0042DA45 EB 1A jmp short 0042DA61
0042DA61 64:67:8F06 0000 pop dword ptr fs:[0]
0042DA67 58 pop eax
0042DA68 61 popad
0042DA69 EB 02 jmp short 0042DA6D
0042DA6D E8 00000000 call 0042DA72
0042DA72 EB 02 jmp short 0042DA76
0042DA76 48 dec eax 在这里F4,就行了.可能是pop dword ptr fs:[0];pop eax;对单步有检查
接下来的是对下面的进行解码
0042DAFD 0D 9EE8E100 or eax, 0E1E89E
0042DB02 B8 00000000 mov eax, 0
0042DB07 48 dec eax
0042DB08 03C1 add eax, ecx
0042DB0A ^ 79 BA jns short 0042DAC6
0042DB0C /EB 02 jmp short 0042DB10 直接F4
然后返回到..也是解码...但和上面不太那个的是:
0042D9B9 5B pop ebx ;这里是刚才解码的...运行完之后,又要消除
0042D9BA E8 00000000 call 0042D9BF
0042D9BF 5F pop edi
0042D9C0 B9 4A190000 mov ecx, 194A
0042D9C5 43 inc ebx
0042D9C6 66:0BC9 or cx, cx
0042D9C9 75 02 jnz short 0042D9CD
0042D9CB CD20 C0040B05 vxdcall 50B04C0
0042D9D1 000C0B add byte ptr [ebx+ecx], cl
0042D9D4 80340B D3 xor byte ptr [ebx+ecx], 0D3
0042D9D8 FE040B inc byte ptr [ebx+ecx]
0042D9DB EB FF jmp short 0042D9DC
0042D9DD C9 leave
0042D9DE ^ 7F E6 jg short 0042D9C6 ; 42d991
0042D9E0 8BC1 mov eax, ecx
0042D9E2 83C1 26 add ecx, 26
0042D9E5 F3:AA rep stos byte ptr es:[edi] ; 对上面的清零
0042D9E7 66:AB stos word ptr es:[edi]
接下,也是解码
0042C076 FFC9 dec ecx
0042C078 ^ 7F E9 jg short 0042C063 ; 对下面解密
0042C07A E8 00000000 call 0042C07F ;直接F4..不过这个地方是上面解码出来的..
这里设置seh..这里,不仅对自身代码,有单步检查..貌似在下面设置,硬件直接断点也要被发现,郁闷啊
不过F2,不能检查到...这个也算暗桩吧..
0042C07F 5D pop ebp
0042C080 8D45 46 lea eax, dword ptr [ebp+46]
0042C083 50 push eax ; seh 42c0c5
0042C084 33C0 xor eax, eax
0042C086 64:FF30 push dword ptr fs:[eax]
0042C089 64:8920 mov dword ptr fs:[eax], esp
0042C08C CC int3 ; 这个异常的处理，是继续
0042C08D 90 nop
0042C08E 8BC0 mov eax, eax
0042C090 F9 stc
0042C091 90 nop
0042C092 8D045D 34120000 lea eax, dword ptr [ebx*2+1234]
0042C099 F8 clc
0042C09A 90 nop
0042C09B C1EB 05 shr ebx, 5
0042C09E FC cld
0042C09F 90 nop
0042C0A0 C1C0 07 rol eax, 7
0042C0A3 90 nop
0042C0A4 90 nop
0042C0A5 33DB xor ebx, ebx
0042C0A7 F7F3 div ebx ; 这个异常处理了，也是继续，但这个seh技术
0042C0A9 64:67:8F06 0000 pop dword ptr fs:[0]
0042C0AF 83C4 04 add esp, 4
0042C0B2 66:BE 4746 mov si, 4647
0042C0B6 66:BF 4D4A mov di, 4A4D
0042C0BA 8A85 99000000 mov al, byte ptr [ebp+99]
0042C0C0 E9 9C000000 jmp 0042C161
0042C0C5 8B4424 04 mov eax, dword ptr [esp+4]
0042C0C9 8B4C24 0C mov ecx, dword ptr [esp+C]
0042C0CD FF81 B8000000 inc dword ptr [ecx+B8]
0042C0D3 8B00 mov eax, dword ptr [eax]
0042C0D5 3D 940000C0 cmp eax, C0000094 ; 是否位内存异常错误，不是的话，继续
0042C0DA 75 24 jnz short 0042C100
0042C0DC FF81 B8000000 inc dword ptr [ecx+B8]
0042C0E2 33C0 xor eax, eax
0042C0E4 2141 04 and dword ptr [ecx+4], eax
0042C0E7 2141 08 and dword ptr [ecx+8], eax
0042C0EA 2141 0C and dword ptr [ecx+C], eax
0042C0ED 2141 10 and dword ptr [ecx+10], eax
0042C0F0 8161 14 F00FFFF>and dword ptr [ecx+14], FFFF0FF0
0042C0F7 8161 18 00DC000>and dword ptr [ecx+18], 0DC00
0042C0FE EB 60 jmp short 0042C160
0042C100 3D 04000080 cmp eax, 80000004 ; 单步中段的话，程序就over了
0042C105 74 0C je short 0042C113
0042C107 3D 03000080 cmp eax, 80000003
0042C10C 74 12 je short 0042C120
0042C10E 6A 01 push 1
0042C110 58 pop eax
0042C111 EB 4D jmp short 0042C160
0042C113 E8 01000000 call 0042C119
直接
0042C163 8885 99000000 mov byte ptr [ebp+99], al ;F2,shift+F9,到这里
下面的代码,是壳需要的IAT的提取...
0042C16F 81E2 0000FFFF and edx, FFFF0000
0042C175 8BC4 mov eax, esp
0042C177 33E4 xor esp, esp
0042C179 8BE0 mov esp, eax
0042C17B 66:813A 4D5A cmp word ptr [edx], 5A4D ; PE
0042C180 74 08 je short 0042C18A
0042C182 81C2 0000FFFF add edx, FFFF0000
0042C188 ^ EB F1 jmp short 0042C17B
0042C18A 8B42 3C mov eax, dword ptr [edx+3C]
0042C18D 3D 00020000 cmp eax, 200
0042C192 ^ 77 E7 ja short 0042C17B
0042C194 813C10 50450000 cmp dword ptr [eax+edx], 4550
0042C19B ^ 75 DE jnz short 0042C17B
0042C19D 8B4410 78 mov eax, dword ptr [eax+edx+78] ; 输出表rva=eax
0042C1A1 8B5C10 1C mov ebx, dword ptr [eax+edx+1C] ; 函数个数
0042C1A5 53 push ebx
0042C1A6 8B5C10 24 mov ebx, dword ptr [eax+edx+24] ; 输出序列号数组
0042C1AA 8B7410 20 mov esi, dword ptr [eax+edx+20] ; 函数名字指针地址
0042C1AE 8B4C10 18 mov ecx, dword ptr [eax+edx+18] ; 函数个数
0042C1B2 8B4410 0C mov eax, dword ptr [eax+edx+C] ; 函数真实名称
0042C1B6 03C2 add eax, edx
0042C1B8 8B00 mov eax, dword ptr [eax]
0042C1BA 25 5F5F5F5F and eax, 5F5F5F5F
0042C1BF 3D 4B45524E cmp eax, 4E52454B ; 判断是否kernel
0042C1C4 74 07 je short 0042C1CD
0042C1C6 68 EBFE0000 push 0FEEB
0042C1CB FFE4 jmp esp
0042C1CD 8D7416 FC lea esi, dword ptr [esi+edx-4]
0042C1D1 8D5C13 FE lea ebx, dword ptr [ebx+edx-2]
0042C1D5 6A 0D push 0D
0042C1D7 5F pop edi
0042C1D8 83C6 04 add esi, 4
0042C1DB 43 inc ebx
0042C1DC 43 inc ebx
0042C1DD 49 dec ecx
0042C1DE ^ 7C E6 jl short 0042C1C6
0042C1E0 8B06 mov eax, dword ptr [esi]
0042C1E2 03C2 add eax, edx
0042C1E4 8138 4C6F6164 cmp dword ptr [eax], 64616F4C ; 判断是否壳自己要的函数
0042C1EA 75 3A jnz short 0042C226
0042C1EC 8178 04 4C69627>cmp dword ptr [eax+4], 7262694C
0042C1F3 75 31 jnz short 0042C226
0042C1F5 8178 08 6172794>cmp dword ptr [eax+8], 41797261
0042C1FC 75 28 jnz short 0042C226
0042C1FE 68 C3030000 push 3C3
0042C203 58 pop eax
0042C204 58 pop eax
0042C205 50 push eax
0042C206 83EC 04 sub esp, 4
0042C209 53 push ebx
0042C20A 03C2 add eax, edx
0042C20C 0FB71B movzx ebx, word ptr [ebx]
0042C20F 8B1C98 mov ebx, dword ptr [eax+ebx*4]
0042C212 03DA add ebx, edx
0042C214 8B4424 04 mov eax, dword ptr [esp+4]
0042C218 891C28 mov dword ptr [eax+ebp], ebx ; 这里到VirtualProtectEx，结束
0042C21B 5B pop ebx
0042C21C 58 pop eax
0042C21D 4F dec edi
0042C21E ^ 75 B8 jnz short 0042C1D8
0042C220 0F84 E5010000 je 0042C40B
0042C226 8138 45786974 cmp dword ptr [eax], 74697845
0042C22C 75 19 jnz short 0042C247
0042C22E 8178 04 50726F6>cmp dword ptr [eax+4], 636F7250
0042C235 75 10 jnz short 0042C247
0042C237 8178 08 6573730>cmp dword ptr [eax+8], 737365
0042C23E 75 07 jnz short 0042C247
0042C240 68 C7030000 push 3C7
0042C245 ^ EB BC jmp short 0042C203
0042C247 8138 56697274 cmp dword ptr [eax], 74726956
0042C24D 75 1F jnz short 0042C26E
0042C24F 8178 04 75616C4>cmp dword ptr [eax+4], 416C6175
0042C256 75 16 jnz short 0042C26E
0042C258 8178 08 6C6C6F6>cmp dword ptr [eax+8], 636F6C6C
0042C25F 75 0D jnz short 0042C26E
0042C261 8078 0C 00 cmp byte ptr [eax+C], 0
0042C265 75 07 jnz short 0042C26E
0042C267 68 CB030000 push 3CB
0042C26C ^ EB 95 jmp short 0042C203
0042C26E 8138 56697274 cmp dword ptr [eax], 74726956
0042C274 75 1C jnz short 0042C292
0042C276 8178 04 75616C4>cmp dword ptr [eax+4], 466C6175
0042C27D 75 13 jnz short 0042C292
0042C27F 8178 08 7265650>cmp dword ptr [eax+8], 656572
0042C286 75 0A jnz short 0042C292
0042C288 68 CF030000 push 3CF
0042C28D ^ E9 71FFFFFF jmp 0042C203
0042C292 8138 43726561 cmp dword ptr [eax], 61657243
0042C298 75 1C jnz short 0042C2B6
0042C29A 8178 04 74654D7>cmp dword ptr [eax+4], 754D6574
0042C2A1 75 13 jnz short 0042C2B6
0042C2A3 8178 08 7465784>cmp dword ptr [eax+8], 41786574
0042C2AA 75 0A jnz short 0042C2B6
0042C2AC 68 D3030000 push 3D3
0042C2B1 ^ E9 4DFFFFFF jmp 0042C203
0042C2B6 8138 4F70656E cmp dword ptr [eax], 6E65704F
0042C2BC 75 1C jnz short 0042C2DA
0042C2BE 8178 04 50726F6>cmp dword ptr [eax+4], 636F7250
0042C2C5 75 13 jnz short 0042C2DA
0042C2C7 8178 08 6573730>cmp dword ptr [eax+8], 737365
0042C2CE 75 0A jnz short 0042C2DA
0042C2D0 68 DB030000 push 3DB
0042C2D5 ^ E9 29FFFFFF jmp 0042C203
0042C2DA 8138 47657443 cmp dword ptr [eax], 43746547
0042C2E0 75 2E jnz short 0042C310
0042C2E2 8178 04 7572726>cmp dword ptr [eax+4], 65727275
0042C2E9 75 25 jnz short 0042C310
0042C2EB 8178 08 6E74507>cmp dword ptr [eax+8], 7250746E
0042C2F2 75 1C jnz short 0042C310
0042C2F4 8178 0C 6F63657>cmp dword ptr [eax+C], 7365636F
0042C2FB 75 13 jnz short 0042C310
0042C2FD 8178 10 7349640>cmp dword ptr [eax+10], 644973
0042C304 75 0A jnz short 0042C310
0042C306 68 D7030000 push 3D7
0042C30B ^ E9 F3FEFFFF jmp 0042C203
0042C310 8138 56697274 cmp dword ptr [eax], 74726956
0042C316 75 25 jnz short 0042C33D
0042C318 8178 04 75616C5>cmp dword ptr [eax+4], 506C6175
0042C31F 75 1C jnz short 0042C33D
0042C321 8178 08 726F746>cmp dword ptr [eax+8], 65746F72
0042C328 75 13 jnz short 0042C33D
0042C32A 8178 0C 6374457>cmp dword ptr [eax+C], 78457463
0042C331 75 0A jnz short 0042C33D
0042C333 68 DF030000 push 3DF
0042C338 ^ E9 C6FEFFFF jmp 0042C203
0042C33D 8138 43726561 cmp dword ptr [eax], 61657243
0042C343 75 1C jnz short 0042C361
0042C345 8178 04 7465466>cmp dword ptr [eax+4], 69466574
0042C34C 75 13 jnz short 0042C361
0042C34E 8178 08 6C65410>cmp dword ptr [eax+8], 0041656C
0042C355 75 0A jnz short 0042C361
0042C357 68 EB030000 push 3EB
0042C35C ^ E9 A2FEFFFF jmp 0042C203
0042C361 8138 436C6F73 cmp dword ptr [eax], 736F6C43
0042C367 75 1C jnz short 0042C385
0042C369 8178 04 6548616>cmp dword ptr [eax+4], 6E614865
0042C370 75 13 jnz short 0042C385
0042C372 8178 08 646C650>cmp dword ptr [eax+8], 656C64
0042C379 75 0A jnz short 0042C385
0042C37B 68 E3030000 push 3E3
0042C380 ^ E9 7EFEFFFF jmp 0042C203
0042C385 8138 52656164 cmp dword ptr [eax], 64616552
0042C38B 75 19 jnz short 0042C3A6
0042C38D 8178 04 46696C6>cmp dword ptr [eax+4], 656C6946
0042C394 75 10 jnz short 0042C3A6
0042C396 8078 08 00 cmp byte ptr [eax+8], 0
0042C39A 75 0A jnz short 0042C3A6
0042C39C 68 E7030000 push 3E7
0042C3A1 ^ E9 5DFEFFFF jmp 0042C203
0042C3A6 8138 4765744D cmp dword ptr [eax], 4D746547
0042C3AC 75 2D jnz short 0042C3DB
0042C3AE 8178 04 6F64756>cmp dword ptr [eax+4], 6C75646F
0042C3B5 75 24 jnz short 0042C3DB
0042C3B7 8178 08 6546696>cmp dword ptr [eax+8], 6C694665
0042C3BE 75 1B jnz short 0042C3DB
0042C3C0 8178 0C 654E616>cmp dword ptr [eax+C], 6D614E65
0042C3C7 75 12 jnz short 0042C3DB
0042C3C9 66:8178 10 6541 cmp word ptr [eax+10], 4165
0042C3CF 75 0A jnz short 0042C3DB
0042C3D1 68 EF030000 push 3EF
0042C3D6 ^ E9 28FEFFFF jmp 0042C203
0042C3DB 8138 47657450 cmp dword ptr [eax], 50746547
0042C3E1 ^ 0F85 F1FDFFFF jnz 0042C1D8
0042C3E7 8178 04 726F634>cmp dword ptr [eax+4], 41636F72
0042C3EE ^ 0F85 E4FDFFFF jnz 0042C1D8
0042C3F4 8178 08 6464726>cmp dword ptr [eax+8], 65726464
0042C3FB ^ 0F85 D7FDFFFF jnz 0042C1D8
0042C401 68 BF030000 push 3BF
0042C406 ^ E9 F8FDFFFF jmp 0042C203
内存中提取的:
0042C43A 00000246 F..
0042C43E 7C80AE30 0畝| kernel32.GetProcAddress
0042C442 7C801D7B {€| kernel32.LoadLibraryA
0042C446 7C81CAFA 亅 kernel32.ExitProcess
0042C44A 7C809AE1 釟€| kernel32.VirtualAlloc
0042C44E 7C809B74 t泙| kernel32.VirtualFree
0042C452 7C80E9CF 祥€| kernel32.CreateMutexA
0042C456 7C8099B0 皺€| kernel32.GetCurrentProcessId
0042C45A 7C8309D1 ?億 kernel32.OpenProcess
0042C45E 7C801A61 a€| kernel32.VirtualProtectEx
0042C462 7C809BD7 讻€| kernel32.CloseHandle
0042C466 7C801812 €| kernel32.ReadFile
0042C46A 7C801A28 (€| kernel32.CreateFileA
0042C46E 7C80B55F _祤| kernel32.GetModuleFileNameA
0042C472 75E40B06 鋟
提取的这几个函数..跟踪后会发现..都是它用到的
接下来,也是seh..
0042C693 2BC9 sub ecx, ecx ; 这个出现，有又是seh
0042C699 64:FF31 push dword ptr fs:[ecx]
0042C6A0 64:8921 mov dword ptr fs:[ecx], esp
0042C6A3 41 inc ecx ; seh。。42C68A
0042C6A4 49 dec ecx
0042C6A8 8DC0 lea eax, eax ; 非法使用寄存器..到这里了
0042C68A 8B6424 08 mov esp, dword ptr [esp+8] ; F2,shift+f9
这个没什么,也是让程序继续下去的手段..
0042C7E2 AD lods dword ptr [esi]
0042C7E3 50 push eax
0042C7E4 8366 FC 00 and dword ptr [esi-4], 0
0042C7E8 ^ E2 F8 loopd short 0042C7E2 ; 把原来得到的函数清零，难道是IAT，加密？
这个是把,原理得到IAT,消除..其实就是转到其他地方..没什么意义
0042C81D 58 pop eax ; kernel32.CreateFileA
0042C81E AB stos dword ptr es:[edi]
0042C81F 83EF 08 sub edi, 8
0042C822 ^ E2 F9 loopd short 0042C81D ; 又把IAT，放入，42C46e中
0042C92A 8BC5 mov eax, ebp
0042C92C 2B85 3D1C0000 sub eax, dword ptr [ebp+1C3D]
0042C932 83E8 7F sub eax, 7F
0042C935 8985 411C0000 mov dword ptr [ebp+1C41], eax
0042C93B 8D7D 81 lea edi, dword ptr [ebp-7F]
0042C93E 57 push edi
0042C93F BB 00040000 mov ebx, 400
0042C944 8D77 08 lea esi, dword ptr [edi+8]
0042C947 68 04010000 push 104
0042C94C 57 push edi
0042C94D 50 push eax
0042C94E FF95 EF030000 call dword ptr [ebp+3EF] ; GetModuleFileNameA
0042C954 56 push esi
0042C955 33C0 xor eax, eax
0042C957 8D48 FF lea ecx, dword ptr [eax-1]
0042C95A FC cld
0042C95B F2:AE repne scas byte ptr es:[edi]
0042C95D F7D1 not ecx
0042C95F 8D51 FF lea edx, dword ptr [ecx-1]
0042C962 FD std
0042C963 4F dec edi
0042C964 B0 5C mov al, 5C
0042C966 F2:AE repne scas byte ptr es:[edi]
0042C968 FC cld
0042C969 47 inc edi
0042C96A 85C9 test ecx, ecx
0042C96C 74 02 je short 0042C970
0042C96E 41 inc ecx
0042C96F 47 inc edi
0042C970 2BD1 sub edx, ecx
0042C972 8BCA mov ecx, edx
0042C974 83E1 1F and ecx, 1F
0042C977 8BF7 mov esi, edi
0042C979 8DBD 3D1D0000 lea edi, dword ptr [ebp+1D3D]
0042C97F F3:A4 rep movs byte ptr es:[edi], byte ptr>
0042C981 5E pop esi
0042C982 5F pop edi
0042C983 6A 00 push 0
0042C985 68 80000000 push 80
0042C98A 6A 03 push 3
0042C98C 6A 00 push 0
0042C98E 6A 01 push 1
0042C990 68 00000080 push 80000000
0042C995 57 push edi
0042C996 FF95 EB030000 call dword ptr [ebp+3EB] ; CreateFileA
0042C99C 50 push eax
0042C99D 6A 00 push 0
0042C99F 57 push edi
0042C9A0 53 push ebx
0042C9A1 56 push esi
0042C9A2 50 push eax
0042C9A3 FF95 E7030000 call dword ptr [ebp+3E7] ; ReadFile
0042C9A9 FF95 E3030000 call dword ptr [ebp+3E3] ; CloseHandle
这里有设置,seh
0042CA85 50 push eax ; wuliao11.0042CA90
0042CA86 33C0 xor eax, eax
0042CA88 64:FF30 push dword ptr fs:[eax]
0042CA8B 64:8920 mov dword ptr fs:[eax], esp ; 又设置，42CA90
0042CAA1 66:F7F3 div bx ;除零异常
然后直接在42C9A0下端点
然后跟到这里
0042CAE4 F8 clc ;stc..改成
0042CAE5 0F83 1A010000 jnb 0042CC05 ; 这个地方不能跳;跳的话,直接程序out..还送一个框框
跟踪到这.应该调试用.自己写了个脚本..不过郁闷的是..这么短的脚本第一次写,竟然用了很长时间,苍天啊..为了下面的跟踪用
/*简单脚本*/
BPHWS 42C07A,"x"
esto
bphwc
bp 42C220
esto
bc 42c220
BPHWS 42ca3D,"x"
esto
BPHWC
mov [42CAE4],#f9#
bphws 42cae4,"x"
esto
bphwc
ret
/*别鄙视*/
接着跟着会到一个int3,断点
到这里又有个seh...42cb03..
然后遇到int3断点
0042CB27 CC int3 ;真这个
有很多seh...
0042CC1B 8BDD mov ebx, ebp ; wuliao11.0042C07F..到这里就OK了
然后是些解码..最后到这里
0042CDC5 E8 06000000 call 0042CDD0
0042CDCA 8B6424 08 mov esp, dword ptr [esp+8] ;这个模式是我们第一个见到的,这里F4
0042CDCE EB 0D jmp short 0042CDDD
0042CDD0 33C9 xor ecx, ecx
0042CDD2 64:FF31 push dword ptr fs:[ecx]
0042CDD5 64:8921 mov dword ptr fs:[ecx], esp
0042CDD8 F1 int1
0042CDD9 FF01 inc dword ptr [ecx]
然后的到这里..
0042CDEF 60 pushad
0042CDF0 E8 06000000 call 0042CDFB
0042CDF5 8B6424 08 mov esp, dword ptr [esp+8]
0042CDF9 EB 1A jmp short 0042CE15
0042CDFB 64:67:FF36 0000 push dword ptr fs:[0]
0042CE01 64:67:8926 0000 mov dword ptr fs:[0], esp
0042CE07 9C pushfd
0042CE08 810C24 00010000 or dword ptr [esp], 100
0042CE0F 9D popfd
0042CE10 F8 clc
0042CE11 ^ 73 DC jnb short 0042CDEF
栈一直出现,这个,不知道有没有用...
0012FF84 0042CC6B ASCII "xPkWZ8Hau3EdYMn9E8dMxxZu"..问题
接下来跟踪没什么意义了
直接..bp GetProcAddress下断点
0042D49E 89BD 52D44000 mov dword ptr [ebp+40D452], edi
0042D4A4 8D85 14BB4000 lea eax, dword ptr [ebp+40BB14]
0042D4AA FFB5 FBCA4000 push dword ptr [ebp+40CAFB]
0042D4B0 0FB608 movzx ecx, byte ptr [eax]
0042D4B3 FF0C24 dec dword ptr [esp]
0042D4B6 7E 05 jle short 0042D4BD
0042D4B8 40 inc eax
0042D4B9 03C1 add eax, ecx
0042D4BB ^ EB F3 jmp short 0042D4B0
0042D4BD 890C24 mov dword ptr [esp], ecx
0042D4C0 FF85 FBCA4000 inc dword ptr [ebp+40CAFB]
0042D4C6 83A5 FBCA4000 0>and dword ptr [ebp+40CAFB], 0F
0042D4CD 8BBD 52D44000 mov edi, dword ptr [ebp+40D452]
0042D4D3 8B85 5AD44000 mov eax, dword ptr [ebp+40D45A]
0042D4D9 0385 4ED34000 add eax, dword ptr [ebp+40D34E]
0042D4DF 8B8D 56D44000 mov ecx, dword ptr [ebp+40D456]
0042D4E5 8908 mov dword ptr [eax], ecx ;这里就是加密..给
0042D4E7 58 pop eax
0042D4E8 83C0 09 add eax, 9
0042D4EB 0185 56D44000 add dword ptr [ebp+40D456], eax
0042D4F1 EB 08 jmp short 0042D4FB
0042D4F3 838D 52D44000 F>or dword ptr [ebp+40D452], FFFFFFFF
0042D4FA 61 popad
0042D4FB 03BD 4ED34000 add edi, dword ptr [ebp+40D34E]
0042D501 85DB test ebx, ebx
0042D503 0F84 C7000000 je 0042D5D0
0042D509 F7C3 00000080 test ebx, 80000000
0042D50F 6A 00 push 0
0042D511 75 0F jnz short 0042D522
0042D513 8D5C13 02 lea ebx, dword ptr [ebx+edx+2]
0042D517 803B 00 cmp byte ptr [ebx], 0
0042D51A 0F84 93000000 je 0042D5B3
0042D520 EB 45 jmp short 0042D567
0042D522 FF0424 inc dword ptr [esp]
0042D525 66:85DB test bx, bx
0042D528 0F84 85000000 je 0042D5B3
0042D52E 8B85 4AD34000 mov eax, dword ptr [ebp+40D34A]
0042D534 3B85 42D44000 cmp eax, dword ptr [ebp+40D442]
0042D53A 75 2B jnz short 0042D567
0042D53C 81E3 FFFFFF7F and ebx, 7FFFFFFF
0042D542 8BD3 mov edx, ebx
0042D544 8D1495 FCFFFFFF lea edx, dword ptr [edx*4-4]
0042D54B 8B9D 4AD34000 mov ebx, dword ptr [ebp+40D34A]
0042D551 8B43 3C mov eax, dword ptr [ebx+3C]
0042D554 8B4418 78 mov eax, dword ptr [eax+ebx+78]
0042D558 035C18 1C add ebx, dword ptr [eax+ebx+1C]
0042D55C 8B041A mov eax, dword ptr [edx+ebx]
0042D55F 0385 4AD34000 add eax, dword ptr [ebp+40D34A]
0042D565 EB 13 jmp short 0042D57A
0042D567 81E3 FFFFFF7F and ebx, 7FFFFFFF
0042D56D 53 push ebx
0042D56E FFB5 4AD34000 push dword ptr [ebp+40D34A]
0042D574 FF95 E0BA4000 call dword ptr [ebp+40BAE0] ;这个是就是GetProcAddresss
0042D57A 40 inc eax ; user32.EndDialog
0042D57B 48 dec eax
0042D57C 75 33 jnz short 0042D5B1
0042D57E 58 pop eax
0042D57F F9 stc
0042D580 ^ 0F82 61FDFFFF jb 0042D2E7
0042D586 47 inc edi
0042D587 44 inc esp
0042D588 49 dec ecx
0042D589 3332 xor esi, dword ptr [edx]
0042D58B 2E:44 inc esp
0042D58D 4C dec esp
0042D58E 4C dec esp
0042D58F 55 push ebp
0042D590 53 push ebx
0042D591 45 inc ebp
0042D592 52 push edx
0042D593 3332 xor esi, dword ptr [edx]
0042D595 2E:44 inc esp
0042D597 4C dec esp
0042D598 4C dec esp
0042D599 53 push ebx
0042D59A 48 dec eax
0042D59B 45 inc ebp
0042D59C 4C dec esp
0042D59D 4C dec esp
0042D59E 3332 xor esi, dword ptr [edx]
0042D5A0 2E:44 inc esp
0042D5A2 4C dec esp
0042D5A3 4C dec esp
0042D5A4 4B dec ebx
0042D5A5 45 inc ebp
0042D5A6 52 push edx
0042D5A7 4E dec esi
0042D5A8 45 inc ebp
0042D5A9 4C dec esp
0042D5AA 3332 xor esi, dword ptr [edx]
0042D5AC 2E:44 inc esp
0042D5AE 4C dec esp
0042D5AF 4C dec esp
0042D5B0 0289 07584874 add cl, byte ptr [ecx+74485807] ;这里没解开,实际是对IAT,表消除记录;
0042D5B6 0D 40F86689 or eax, 8966F840
0042D5BB 43 inc ebx
0042D5BC FE88 03433803 dec byte ptr [eax+3384303]
0042D5C2 ^ 75 F9 jnz short 0042D5BD
0042D5C4 8385 4ED34000 0>add dword ptr [ebp+40D34E], 4
0042D5CB ^ E9 BAFDFFFF jmp 0042D38A
IAT修复..这里不知道该怎么办..哪位能给在下解答..感激不尽..虽然可以用插件修复
IAT之后,跟踪到这
0042D653 03C7 add eax, edi
0042D655 0385 72D34000 add eax, dword ptr [ebp+40D372]
0042D65B 50 push eax
0042D65C 51 push ecx
0042D65D E8 13FAFFFF call 0042D075
进去
0042D075 60 pushad
0042D076 8B5C24 24 mov ebx, dword ptr [esp+24]
0042D07A 83C3 10 add ebx, 10
0042D07D 6A 04 push 4
0042D07F 68 00100000 push 1000
0042D084 53 push ebx
0042D085 6A 00 push 0
0042D087 FF95 ECBA4000 call dword ptr [ebp+40BAEC] ; VritualAlloc
0042D08D 85C0 test eax, eax ; 3f0000
0042D08F 0F84 D6000000 je 0042D16B
0042D095 8BF8 mov edi, eax
也就是解码..代码长,但就没用..
bp VirtualFree..
然后再跟踪到
0042D68E FF95 F8BA4000 call dword ptr [ebp+40BAF8]
0042D694 8BD8 mov ebx, eax
0042D696 50 push eax
0042D697 6A 00 push 0
0042D699 68 FF0F1F00 push 1F0FFF
0042D69E FF95 FCBA4000 call dword ptr [ebp+40BAFC] ; OpenProcess
0042D6A4 40 inc eax
0042D6A5 48 dec eax
0042D6A6 74 2B je short 0042D6D3
0042D6A8 6A 00 push 0
0042D6AA 54 push esp
0042D6AB 6A 04 push 4
0042D6AD 68 00100000 push 1000
0042D6B2 FFB5 62D34000 push dword ptr [ebp+40D362] ; 400000
0042D6B8 50 push eax
0042D6B9 FF95 00BB4000 call dword ptr [ebp+40BB00] ; VitualProtectEx
这一段是对4,应该是readonly..那么离oep不远了..^ ^
然后遇到几个异常..
最后到
0042D7AC 8B6424 08 mov esp, dword ptr [esp+8] ;这里应很熟悉了..第一次,也是这个F4
0042D7B0 EB 0D jmp short 0042D7BF
0042D7B2 2BC9 sub ecx, ecx
0042D7B4 64:FF31 push dword ptr fs:[ecx]
0042D7B7 64:8921 mov dword ptr fs:[ecx], esp
0042D7BA F1 int1
0042D7BB FF01 inc dword ptr [ecx]
0042D7BD ^ EB E8 jmp short 0042D7A7
0042D7D5 2BC1 sub eax, ecx ;这个很熟悉了吧..
0042D7D7 60 pushad
0042D7D8 E8 06000000 call 0042D7E3
0042D7DD 8B6424 08 mov esp, dword ptr [esp+8]
0042D7E1 EB 1A jmp short 0042D7FD
0042D7E3 64:67:FF36 0000 push dword ptr fs:[0]
0042D7E9 64:67:8926 0000 mov dword ptr fs:[0], esp
0042D7EF 9C pushfd
0042D7F0 810C24 00010000 or dword ptr [esp], 100
0042D7F7 9D popfd
0042D7F8 F8 clc
0042D7F9 ^ 73 DC jnb short 0042D7D7
0042D8B3 F8 clc
0042D8B4 72 7D jb short 0042D933
0042D8B6 51 push ecx
0042D8B7 8BCB mov ecx, ebx
0042D8B9 E3 03 jecxz short 0042D8BE
0042D8BB 59 pop ecx
0042D8BC ^ EB AD jmp short 0042D86B
0042D8BE 59 pop ecx ;解码,没什么意义直接F4
0042D791 F3:AA rep stos byte ptr es:[edi]
0042D793 66:AB stos word ptr es:[edi]
0042D795 EB 02 jmp short 0042D799 这里,再F7,几步直接到达,oep
0042D799 61 popad
0042D79A - FF6424 D0 jmp dword ptr [esp-30] ; wuliao11.004017B0..到oep了
总结,只要过前面一段seh..也就是那个脚本..然后直接在
然后在GetProcAddress,下断点..然后在code..下断点..就行了..
[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)
