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[原创]分析运行过的反汇编代码
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发表于: 2023-11-8 20:41
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一、 阅读一个函数的反汇编代码，我将其归纳为四个角度:
还原对象代码如下：
先观察一下，该函数涉及到局部变量:
解读运行过程中，本模块被执行过的反汇编代码：
其中0x123存放到了寄存器esi引用内存中，并没有放到局部变量中，说明它的指针变量是可以被优化的。
以上是关于函数变量的赋值过程。
这部分代码是一个数组遍历的过程。
这样的形式，基本上可以认为是传入的结构体参数或者返回的结构体类型。
这里非常有意思的是，ebp-0x18这个地址不是直接作为左值的，而是通过相邻的地址较小的ebp-0x1C通过偏移来进行应用的。
上面基本可以看出结构体的赋值功能，类似C++的等号赋值语句了。
与开始提到的fs:0相呼应。
反汇编代码:
注: 此文仅作本人平时练习笔记用，如果文中有偏倚之处，望高手指点一二。如有受帮助的朋友，深感荣幸。
;ebp : 0x0019FF70
/*0x004011A0*/ push ebp
/*0x004011A1*/ mov ebp, esp
;ebp : 0x0019FF28
/*0x004011A3*/ push 0xFFFFFFFF
/*0x004011A5*/ push 0x40220D
/*0x004011AA*/ mov eax, dword ptr fs:[0x00000000]
/*0x004011B0*/ push eax
/*0x004011B1*/ sub esp, 0x18
/*0x004011B4*/ mov eax, dword ptr ds:[0x00404004]
/*0x004011B9*/ xor eax, ebp
/*0x004011BB*/ mov dword ptr ss:[ebp-0x10], eax
/*0x004011BE*/ push ebx
/*0x004011BF*/ push esi
/*0x004011C0*/ push edi
/*0x004011C1*/ push eax
/*0x004011C2*/ lea eax, ss:[ebp-0xC]
/*0x004011C5*/ mov dword ptr fs:[0x00000000], eax
/*0x004011CB*/ push 0x4
/*0x004011CD*/ call 0x004014CA
/*0x004014CA*/ push ebp
/*0x004014CB*/ mov ebp, esp
;ebp : 0x0019FEE8
;/*0x004014CD*/ jmp 0x004014DC
/*0x004014DC*/ push dword ptr ss:[ebp+0x8]
/*0x004014DF*/ call 0x004020DE
;/*0x004020DE*/ jmp dword ptr ds:[0x00403064]
/*0x76FA2610*/ mov edi, edi
/*0x76FA2651*/ ret
;ebp : 0x0019FF28
/*0x004014EA*/ ret
/*0x004011D2*/ mov esi, eax
/*0x004011D4*/ push 0x8
/*0x004011D6*/ mov dword ptr ds:[esi], 0x123
/*0x004011DC*/ call 0x004014CA
;ebp : 0x0019FEE4
/*0x004014E4*/ pop ecx
/*0x004014E5*/ test eax, eax
;/*0x004014E7*/ je 0x004014CF;GOTO BACK
/*0x004014E9*/ pop ebp
;ebp : 0x0019FF28
/*0x004011E1*/ mov edi, eax
/*0x004011E3*/ mov dword ptr ss:[ebp-0x24], 0x456
/*0x004011EA*/ push 0x4
/*0x004011EC*/ mov dword ptr ds:[edi+0x4], esi
/*0x004011EF*/ mov dword ptr ds:[edi], 0x888
/*0x004011F5*/ call 0x004014CA
/*0x004011FA*/ mov ebx, eax
/*0x004011FC*/ mov dword ptr ss:[ebp-0x14], 0x0
/*0x00401203*/ xorps xmm0, xmm0
/*0x00401206*/ mov dword ptr ss:[ebp-0x20], ebx
/*0x00401209*/ movq qword ptr ss:[ebp-0x1C], xmm0
/*0x0040120E*/ add esp, 0xC
/*0x00401211*/ mov dword ptr ss:[ebp-0x1C], 0x0
/*0x00401218*/ mov dword ptr ds:[ebx], 0x987
/*0x0040121E*/ mov dword ptr ss:[ebp-0x18], 0x0
/*0x00401225*/ mov dword ptr ss:[ebp-0x14], 0x0
/*0x0040122C*/ push edi
/*0x0040122D*/ push 0x0
/*0x0040122F*/ lea ecx, ss:[ebp-0x1C]
/*0x00401232*/ mov dword ptr ss:[ebp-0x4], 0x0
/*0x00401239*/ call 0x00401350
/*0x00401350*/ push ebp
/*0x00401351*/ mov ebp, esp
;ebp : 0x0019FEE4
/*0x00401353*/ sub esp, 0xC
/*0x00401356*/ mov eax, dword ptr ss:[ebp+0x8]
/*0x00401359*/ push edi
/*0x0040135A*/ mov edi, ecx
/*0x0040135C*/ mov dword ptr ss:[ebp-0x8], eax
/*0x0040135F*/ mov edx, dword ptr ds:[edi]
/*0x00401361*/ sub eax, edx
/*0x00401363*/ sar eax, 0x3
/*0x00401366*/ mov dword ptr ss:[ebp-0x4], eax
/*0x00401369*/ mov eax, dword ptr ds:[edi+0x4]
/*0x0040136C*/ sub eax, edx
/*0x0040136E*/ sar eax, 0x3
/*0x00401371*/ cmp eax, 0x1FFFFFFF
;/*0x00401376*/ je 0x004014A8
/*0x0040137C*/ mov ecx, dword ptr ds:[edi+0x8]
/*0x0040137F*/ sub ecx, edx
/*0x00401381*/ sar ecx, 0x3
/*0x00401384*/ push ebx
/*0x00401385*/ push esi
/*0x00401386*/ lea esi, ds:[eax+0x1]
/*0x00401389*/ mov edx, ecx
/*0x0040138B*/ shr edx, 0x1
/*0x0040138D*/ mov eax, 0x1FFFFFFF
/*0x00401392*/ sub eax, edx
/*0x00401394*/ mov dword ptr ss:[ebp-0xC], esi
/*0x00401397*/ cmp ecx, eax
;/*0x00401399*/ ja 0x004014A3
/*0x0040139F*/ lea eax, ds:[edx+ecx*1]
/*0x004013A2*/ mov ebx, esi
/*0x004013A4*/ cmp eax, esi
/*0x004013A6*/ cmovae ebx, eax
/*0x004013A9*/ cmp ebx, 0x1FFFFFFF
;/*0x004013AF*/ ja 0x004014A3
/*0x004013B5*/ shl ebx, 0x3
/*0x004013B8*/ cmp ebx, 0x1000
;/*0x004013BE*/ jb 0x004013E7
/*0x004013E7*/ test ebx, ebx
;/*0x004013E9*/ je 0x004013F8
/*0x004013EB*/ push ebx
/*0x004013EC*/ call 0x004014CA
/*0x004013F1*/ add esp, 0x4
/*0x004013F4*/ mov esi, eax
;/*0x004013F6*/ jmp 0x004013FA
/*0x004013FA*/ mov eax, dword ptr ss:[ebp-0x4]
/*0x004013FD*/ lea edx, ds:[esi+eax*8]
/*0x00401400*/ mov eax, dword ptr ss:[ebp+0xC]
/*0x00401403*/ mov dword ptr ss:[ebp-0x4], edx
/*0x00401406*/ mov ecx, dword ptr ds:[eax]
/*0x00401408*/ mov eax, dword ptr ds:[eax+0x4]
/*0x0040140B*/ mov dword ptr ds:[edx], ecx
/*0x0040140D*/ mov dword ptr ds:[edx+0x4], eax
/*0x00401410*/ mov eax, dword ptr ds:[edi+0x4]
/*0x00401413*/ mov edx, dword ptr ss:[ebp-0x8]
/*0x00401416*/ mov ecx, dword ptr ds:[edi]
/*0x00401418*/ cmp edx, eax
;/*0x0040141A*/ jne 0x0040142B
/*0x0040141C*/ sub eax, ecx
/*0x0040141E*/ push eax
/*0x0040141F*/ push ecx
/*0x00401420*/ push esi
/*0x00401421*/ call 0x004021F2
;/*0x004021F2*/ jmp dword ptr ds:[0x0040305C]
/*0x728E33E0*/ push edi
/*0x728E3916*/ ret
;ebp : 0x0019FF28
/*0x0040149A*/ ret 0x8
/*0x0040123E*/ mov esi, dword ptr ss:[ebp-0x18]
/*0x00401241*/ cmp esi, dword ptr ss:[ebp-0x14]
;/*0x00401244*/ je 0x00401254
/*0x00401254*/ lea eax, ss:[ebp-0x24]
/*0x00401257*/ push eax
/*0x00401258*/ push esi
/*0x00401259*/ lea ecx, ss:[ebp-0x1C]
/*0x0040125C*/ call
;ebp : 0x0019FEE4
/*0x00401426*/ add esp, 0xC
;/*0x00401429*/ jmp 0x0040144E
/*0x0040144E*/ mov eax, dword ptr ds:[edi]
/*0x00401450*/ test eax, eax
;/*0x00401452*/ je 0x00401480
/*0x00401454*/ mov ecx, dword ptr ds:[edi+0x8]
/*0x00401457*/ sub ecx, eax
/*0x00401459*/ and ecx, 0xFFFFFFF8
/*0x0040145C*/ cmp ecx, 0x1000
;/*0x00401462*/ jb 0x00401476
/*0x00401476*/ push ecx
/*0x00401477*/ push eax
/*0x00401478*/ call 0x004014FA
/*0x004014FA*/ push ebp
/*0x004014FB*/ mov ebp, esp
;ebp : 0x0019FEBC
/*0x004014FD*/ push dword ptr ss:[ebp+0x8]
/*0x00401500*/ call 0x004018D3
;/*0x004018D3*/ jmp 0x00402156
;/*0x00402156*/ jmp dword ptr ds:[0x00403068]
/*0x76FA5F80*/ mov edi, edi
/*0x76FA5F9E*/ ret
;ebp : 0x0019FEE4
/*0x00401507*/ ret
/*0x0040147D*/ add esp, 0x8
/*0x00401480*/ mov eax, dword ptr ss:[ebp-0xC]
/*0x00401483*/ mov dword ptr ds:[edi], esi
/*0x00401485*/ lea ecx, ds:[esi+eax*8]
/*0x00401488*/ mov eax, dword ptr ss:[ebp-0x4]
/*0x0040148B*/ mov dword ptr ds:[edi+0x4], ecx
/*0x0040148E*/ lea ecx, ds:[ebx+esi*1]
/*0x00401491*/ pop esi
/*0x00401492*/ pop ebx
/*0x00401493*/ mov dword ptr ds:[edi+0x8], ecx
/*0x00401496*/ pop edi
/*0x00401497*/ mov esp, ebp
/*0x00401499*/ pop ebp
;ebp : 0x0019FF28
/*0x00401261*/ mov esi, dword ptr ss:[ebp-0x18]
/*0x00401264*/ mov edi, dword ptr ss:[ebp-0x1C]
/*0x00401267*/ xor ebx, ebx
/*0x00401269*/ sub esi, edi
/*0x0040126B*/ sar esi, 0x3
/*0x0040126E*/ test esi, esi
;/*0x00401270*/ je 0x0040128D
/*0x00401272*/ mov eax, dword ptr ds:[edi+ebx*8+0x4]
/*0x00401276*/ push dword ptr ds:[eax]
/*0x00401278*/ push dword ptr ds:[edi+ebx*8]
/*0x0040127B*/ push 0x403198
/*0x00401280*/ call 0x00401010
/*0x00401010*/ push ebp
/*0x00401011*/ mov ebp, esp
;ebp : 0x0019FEE0
/*0x00401013*/ push esi
/*0x00401014*/ mov esi, dword ptr ss:[ebp+0x8]
/*0x00401017*/ push 0x1
/*0x00401019*/ call dword ptr ds:[0x004030E0]
/*0x76FB57C0*/ mov edi, edi
/*0x76FB57CF*/ ret
/*0x76F999F0*/ mov edi, edi
/*0x76F99A10*/ ret
;ebp : 0x0019FF28
/*0x0040103F*/ ret
/*0x00401285*/ inc ebx
/*0x00401286*/ add esp, 0xC
/*0x00401289*/ cmp ebx, esi
;/*0x0040128B*/ jb 0x00401272;GOTO BACK
;ebp : 0x0019FEE0
/*0x76F999F2*/ push ebp
/*0x0040103A*/ add esp, 0x18
/*0x0040103D*/ pop esi
/*0x0040103E*/ pop ebp
;ebp : 0x0019FF28
/*0x0040128D*/ push 0x4031A0
/*0x00401292*/ call 0x00401010
;ebp : 0x0019FEE8
/*0x0040101F*/ add esp, 0x4
/*0x00401022*/ lea ecx, ss:[ebp+0xC]
/*0x00401025*/ push ecx
/*0x00401026*/ push 0x0
/*0x00401028*/ push esi
/*0x00401029*/ push eax
/*0x0040102A*/ call 0x00401000
/*0x00401000*/ mov eax, 0x4043F0
/*0x00401005*/ ret
/*0x0040102F*/ push dword ptr ds:[eax+0x4]
/*0x00401032*/ push dword ptr ds:[eax]
/*0x00401034*/ call dword ptr ds:[0x004030DC]
/*0x76F999F3*/ mov ebp, esp
;ebp : 0x0019FF28
/*0x00401297*/ add esp, 0x4
/*0x0040129A*/ test edi, edi
;/*0x0040129C*/ je 0x004012D0
/*0x0040129E*/ mov ecx, dword ptr ss:[ebp-0x14]
/*0x004012A1*/ mov eax, edi
/*0x004012A3*/ sub ecx, edi
/*0x004012A5*/ and ecx, 0xFFFFFFF8
/*0x004012A8*/ cmp ecx, 0x1000
;/*0x004012AE*/ jb 0x004012C6
/*0x004012C6*/ push ecx
/*0x004012C7*/ push edi
/*0x004012C8*/ call 0x004014FA
;ebp : 0x0019FEE4
/*0x00401505*/ pop ecx
/*0x00401506*/ pop ebp
;ebp : 0x0019FF28
/*0x004012CD*/ add esp, 0x8
/*0x004012D0*/ xor eax, eax
/*0x004012D2*/ mov ecx, dword ptr ss:[ebp-0xC]
/*0x004012D5*/ mov dword ptr fs:[0x00000000], ecx
/*0x004012DC*/ pop ecx
/*0x004012DD*/ pop edi
/*0x004012DE*/ pop esi
/*0x004012DF*/ pop ebx
/*0x004012E0*/ mov ecx, dword ptr ss:[ebp-0x10]
/*0x004012E3*/ xor ecx, ebp
/*0x004012E5*/ call 0x004014BC
/*0x004014BC*/ cmp ecx, dword ptr ds:[0x00404004]
;/*0x004014C2*/ jne 0x004014C5
/*0x004014C4*/ ret
/*0x004012EA*/ mov esp, ebp
/*0x004012EC*/ pop ebp
;ebp : 0x0019FF70
/*0x004012ED*/ ret
;ebp : 0x0019FF70
/*0x004011A0*/ push ebp
/*0x004011A1*/ mov ebp, esp
;ebp : 0x0019FF28
/*0x004011A3*/ push 0xFFFFFFFF
/*0x004011A5*/ push 0x40220D
/*0x004011AA*/ mov eax, dword ptr fs:[0x00000000]
/*0x004011B0*/ push eax
/*0x004011B1*/ sub esp, 0x18
/*0x004011B4*/ mov eax, dword ptr ds:[0x00404004]
/*0x004011B9*/ xor eax, ebp
/*0x004011BB*/ mov dword ptr ss:[ebp-0x10], eax
/*0x004011BE*/ push ebx
/*0x004011BF*/ push esi
/*0x004011C0*/ push edi
/*0x004011C1*/ push eax
/*0x004011C2*/ lea eax, ss:[ebp-0xC]
/*0x004011C5*/ mov dword ptr fs:[0x00000000], eax
/*0x004011CB*/ push 0x4
/*0x004011CD*/ call 0x004014CA
/*0x004014CA*/ push ebp
/*0x004014CB*/ mov ebp, esp
;ebp : 0x0019FEE8
;/*0x004014CD*/ jmp 0x004014DC
/*0x004014DC*/ push dword ptr ss:[ebp+0x8]
/*0x004014DF*/ call 0x004020DE
;/*0x004020DE*/ jmp dword ptr ds:[0x00403064]
/*0x76FA2610*/ mov edi, edi
/*0x76FA2651*/ ret
;ebp : 0x0019FF28
/*0x004014EA*/ ret
/*0x004011D2*/ mov esi, eax
/*0x004011D4*/ push 0x8
/*0x004011D6*/ mov dword ptr ds:[esi], 0x123
/*0x004011DC*/ call 0x004014CA
;ebp : 0x0019FEE4
/*0x004014E4*/ pop ecx
/*0x004014E5*/ test eax, eax
;/*0x004014E7*/ je 0x004014CF;GOTO BACK
/*0x004014E9*/ pop ebp
;ebp : 0x0019FF28
/*0x004011E1*/ mov edi, eax
/*0x004011E3*/ mov dword ptr ss:[ebp-0x24], 0x456
/*0x004011EA*/ push 0x4
/*0x004011EC*/ mov dword ptr ds:[edi+0x4], esi
/*0x004011EF*/ mov dword ptr ds:[edi], 0x888
/*0x004011F5*/ call 0x004014CA
/*0x004011FA*/ mov ebx, eax
/*0x004011FC*/ mov dword ptr ss:[ebp-0x14], 0x0
/*0x00401203*/ xorps xmm0, xmm0
/*0x00401206*/ mov dword ptr ss:[ebp-0x20], ebx
/*0x00401209*/ movq qword ptr ss:[ebp-0x1C], xmm0
/*0x0040120E*/ add esp, 0xC
/*0x00401211*/ mov dword ptr ss:[ebp-0x1C], 0x0
/*0x00401218*/ mov dword ptr ds:[ebx], 0x987
/*0x0040121E*/ mov dword ptr ss:[ebp-0x18], 0x0
/*0x00401225*/ mov dword ptr ss:[ebp-0x14], 0x0
/*0x0040122C*/ push edi
/*0x0040122D*/ push 0x0
/*0x0040122F*/ lea ecx, ss:[ebp-0x1C]
/*0x00401232*/ mov dword ptr ss:[ebp-0x4], 0x0
/*0x00401239*/ call 0x00401350
/*0x00401350*/ push ebp
/*0x00401351*/ mov ebp, esp
;ebp : 0x0019FEE4
/*0x00401353*/ sub esp, 0xC
/*0x00401356*/ mov eax, dword ptr ss:[ebp+0x8]
/*0x00401359*/ push edi
/*0x0040135A*/ mov edi, ecx
/*0x0040135C*/ mov dword ptr ss:[ebp-0x8], eax
/*0x0040135F*/ mov edx, dword ptr ds:[edi]
/*0x00401361*/ sub eax, edx
/*0x00401363*/ sar eax, 0x3
/*0x00401366*/ mov dword ptr ss:[ebp-0x4], eax
/*0x00401369*/ mov eax, dword ptr ds:[edi+0x4]
/*0x0040136C*/ sub eax, edx
/*0x0040136E*/ sar eax, 0x3
/*0x00401371*/ cmp eax, 0x1FFFFFFF
;/*0x00401376*/ je 0x004014A8
/*0x0040137C*/ mov ecx, dword ptr ds:[edi+0x8]
/*0x0040137F*/ sub ecx, edx
/*0x00401381*/ sar ecx, 0x3
/*0x00401384*/ push ebx
/*0x00401385*/ push esi
/*0x00401386*/ lea esi, ds:[eax+0x1]
/*0x00401389*/ mov edx, ecx
/*0x0040138B*/ shr edx, 0x1
/*0x0040138D*/ mov eax, 0x1FFFFFFF
/*0x00401392*/ sub eax, edx
/*0x00401394*/ mov dword ptr ss:[ebp-0xC], esi
/*0x00401397*/ cmp ecx, eax
;/*0x00401399*/ ja 0x004014A3
/*0x0040139F*/ lea eax, ds:[edx+ecx*1]
/*0x004013A2*/ mov ebx, esi
/*0x004013A4*/ cmp eax, esi
/*0x004013A6*/ cmovae ebx, eax
/*0x004013A9*/ cmp ebx, 0x1FFFFFFF
;/*0x004013AF*/ ja 0x004014A3
/*0x004013B5*/ shl ebx, 0x3
/*0x004013B8*/ cmp ebx, 0x1000
;/*0x004013BE*/ jb 0x004013E7
/*0x004013E7*/ test ebx, ebx
;/*0x004013E9*/ je 0x004013F8
/*0x004013EB*/ push ebx
/*0x004013EC*/ call 0x004014CA
/*0x004013F1*/ add esp, 0x4
/*0x004013F4*/ mov esi, eax
;/*0x004013F6*/ jmp 0x004013FA
/*0x004013FA*/ mov eax, dword ptr ss:[ebp-0x4]
/*0x004013FD*/ lea edx, ds:[esi+eax*8]
/*0x00401400*/ mov eax, dword ptr ss:[ebp+0xC]
/*0x00401403*/ mov dword ptr ss:[ebp-0x4], edx
/*0x00401406*/ mov ecx, dword ptr ds:[eax]
/*0x00401408*/ mov eax, dword ptr ds:[eax+0x4]
/*0x0040140B*/ mov dword ptr ds:[edx], ecx
/*0x0040140D*/ mov dword ptr ds:[edx+0x4], eax
/*0x00401410*/ mov eax, dword ptr ds:[edi+0x4]
/*0x00401413*/ mov edx, dword ptr ss:[ebp-0x8]
/*0x00401416*/ mov ecx, dword ptr ds:[edi]
/*0x00401418*/ cmp edx, eax
;/*0x0040141A*/ jne 0x0040142B
/*0x0040141C*/ sub eax, ecx
/*0x0040141E*/ push eax
/*0x0040141F*/ push ecx
/*0x00401420*/ push esi
/*0x00401421*/ call 0x004021F2
;/*0x004021F2*/ jmp dword ptr ds:[0x0040305C]
/*0x728E33E0*/ push edi
/*0x728E3916*/ ret
;ebp : 0x0019FF28
/*0x0040149A*/ ret 0x8
/*0x0040123E*/ mov esi, dword ptr ss:[ebp-0x18]
/*0x00401241*/ cmp esi, dword ptr ss:[ebp-0x14]
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最后于 2023-11-8 20:47
被_THINCT编辑
，原因：
