汇编学习二-VB(常见函数分析)
- VB代码如下所示
1 00401FF0 > ?5 push ebp 2 00401FF1 . 8BEC mov ebp,esp 3 00401FF3 . 83EC 0C sub esp,0xC 4 00401FF6 . 68 26104000 push <jmp.&MSVBVM50.__vbaExceptHandler> ; SE handler installation 5 00401FFB . 64:A1 0000000>mov eax,dword ptr fs:[0] 6 00402001 . 50 push eax 7 00402002 . 64:8925 00000>mov dword ptr fs:[0],esp 8 00402009 . 81EC 18010000 sub esp,0x118 9 0040200F . 53 push ebx 10 00402010 . 8B5D 08 mov ebx,dword ptr ss:[ebp+0x8] 11 00402013 . 8BC3 mov eax,ebx 12 00402015 . 56 push esi ; msvbvm50.__vbaVarMove 13 00402016 . 83E3 FE and ebx,0xFFFFFFFE 14 00402019 . 57 push edi ; msvbvm50.__vbaFreeVarList 15 0040201A . 8965 F4 mov dword ptr ss:[ebp-0xC],esp 16 0040201D . 83E0 01 and eax,0x1 17 00402020 . 8B3B mov edi,dword ptr ds:[ebx] 18 00402022 . C745 F8 00104>mov dword ptr ss:[ebp-0x8],Andréna.00401000 19 00402029 . 53 push ebx 20 0040202A . 8945 FC mov dword ptr ss:[ebp-0x4],eax 21 0040202D . 895D 08 mov dword ptr ss:[ebp+0x8],ebx 22 00402030 . FF57 04 call dword ptr ds:[edi+0x4] 23 00402033 . 33F6 xor esi,esi ; msvbvm50.__vbaVarMove 24 00402035 . 53 push ebx 25 00402036 . 8975 DC mov dword ptr ss:[ebp-0x24],esi ; msvbvm50.__vbaVarMove 26 00402039 . 8975 CC mov dword ptr ss:[ebp-0x34],esi ; msvbvm50.__vbaVarMove 27 0040203C . 8975 BC mov dword ptr ss:[ebp-0x44],esi ; msvbvm50.__vbaVarMove 28 0040203F . 8975 AC mov dword ptr ss:[ebp-0x54],esi ; msvbvm50.__vbaVarMove 29 00402042 . 8975 A8 mov dword ptr ss:[ebp-0x58],esi ; msvbvm50.__vbaVarMove 30 00402045 . 8975 A4 mov dword ptr ss:[ebp-0x5C],esi ; msvbvm50.__vbaVarMove 31 00402048 . 8975 94 mov dword ptr ss:[ebp-0x6C],esi ; msvbvm50.__vbaVarMove 32 0040204B . 8975 84 mov dword ptr ss:[ebp-0x7C],esi ; msvbvm50.__vbaVarMove 33 0040204E . 89B5 74FFFFFF mov dword ptr ss:[ebp-0x8C],esi ; msvbvm50.__vbaVarMove 34 00402054 . 89B5 64FFFFFF mov dword ptr ss:[ebp-0x9C],esi ; msvbvm50.__vbaVarMove 35 0040205A . 89B5 54FFFFFF mov dword ptr ss:[ebp-0xAC],esi ; msvbvm50.__vbaVarMove 36 00402060 . 89B5 44FFFFFF mov dword ptr ss:[ebp-0xBC],esi ; msvbvm50.__vbaVarMove 37 00402066 . 89B5 14FFFFFF mov dword ptr ss:[ebp-0xEC],esi ; msvbvm50.__vbaVarMove 38 0040206C . 89B5 F8FEFFFF mov dword ptr ss:[ebp-0x108],esi ; msvbvm50.__vbaVarMove 39 00402072 . 89B5 E8FEFFFF mov dword ptr ss:[ebp-0x118],esi ; msvbvm50.__vbaVarMove 40 00402078 . FF97 FC020000 call dword ptr ds:[edi+0x2FC] 41 0040207E . 8D4D A4 lea ecx,dword ptr ss:[ebp-0x5C] 42 00402081 . 50 push eax 43 00402082 . 51 push ecx 44 00402083 . FF15 24414000 call dword ptr ds:[<&MSVBVM50.__vbaObjSet>] ; msvbvm50.__vbaObjSet 45 00402089 . 8BD8 mov ebx,eax 46 0040208B . 8D45 A8 lea eax,dword ptr ss:[ebp-0x58] 47 0040208E . 50 push eax 48 0040208F . 53 push ebx 49 00402090 . 8B13 mov edx,dword ptr ds:[ebx] 50 00402092 . FF92 A0000000 call dword ptr ds:[edx+0xA0] ; Andréna.00401A24 51 00402098 . 3BC6 cmp eax,esi ; msvbvm50.__vbaVarMove 52 0040209A . 7D 12 jge short Andréna.004020AE 53 0040209C . 68 A0000000 push 0xA0 54 004020A1 . 68 201C4000 push Andréna.00401C20 55 004020A6 . 53 push ebx 56 004020A7 . 50 push eax 57 004020A8 . FF15 14414000 call dword ptr ds:[<&MSVBVM50.__vbaHresultCheckObj>] 58 004020AE > 8B45 A8 mov eax,dword ptr ss:[ebp-0x58] ; 用户名 0012f488=00ebcbdc='wlp' 59 004020B1 . 8975 A8 mov dword ptr ss:[ebp-0x58],esi ; 00ebcbdc='wlp' 60 004020B4 . 8B35 FC404000 mov esi,dword ptr ds:[<&MSVBVM50.__vbaVarMove>] 61 004020BA . 8D55 94 lea edx,dword ptr ss:[ebp-0x6C] ; edx=0012f474 62 004020BD . 8D4D BC lea ecx,dword ptr ss:[ebp-0x44] ; ecx=0012f49c 63 004020C0 . 8945 9C mov dword ptr ss:[ebp-0x64],eax ; 0012f47c=00ebcbdc='wlp' 64 004020C3 . C745 94 08000>mov dword ptr ss:[ebp-0x6C],0x8 ; 0012f474 65 004020CA . FFD6 call esi ; msvbvm50.__vbaVarMove; <&MSVBVM50.__vbaVarMove> 66 004020CC . 8D4D A4 lea ecx,dword ptr ss:[ebp-0x5C] ; 上述函数交换ecx,eax .ecx=0012f484 67 004020CF . FF15 B4414000 call dword ptr ds:[<&MSVBVM50.__vbaFreeObj>] 68 004020D5 . B8 01000000 mov eax,0x1 ; eax=1 69 004020DA . 8D8D 54FFFFFF lea ecx,dword ptr ss:[ebp-0xAC] ; ecx=0012f434 70 004020E0 . 8985 5CFFFFFF mov dword ptr ss:[ebp-0xA4],eax ; 0012f43c=eax=1 71 004020E6 . 8985 4CFFFFFF mov dword ptr ss:[ebp-0xB4],eax ; 0012f42c=eax=1 72 004020EC . 8D55 BC lea edx,dword ptr ss:[ebp-0x44] ; edx=0012f49c 73 004020EF . 51 push ecx 74 004020F0 . 8D45 94 lea eax,dword ptr ss:[ebp-0x6C] ; eax=0012f474 75 004020F3 . BB 02000000 mov ebx,0x2 76 004020F8 . 52 push edx 77 004020F9 . 50 push eax 78 004020FA . 899D 54FFFFFF mov dword ptr ss:[ebp-0xAC],ebx ; 已知ebx=2 79 00402100 . 899D 44FFFFFF mov dword ptr ss:[ebp-0xBC],ebx 80 00402106 . FF15 18414000 call dword ptr ds:[<&MSVBVM50.__vbaLenVar>] 81 0040210C . 8D8D 44FFFFFF lea ecx,dword ptr ss:[ebp-0xBC] ; ecx=序列号长度+1 82 00402112 . 50 push eax 83 00402113 . 8D95 E8FEFFFF lea edx,dword ptr ss:[ebp-0x118] 84 00402119 . 51 push ecx 85 0040211A . 8D85 F8FEFFFF lea eax,dword ptr ss:[ebp-0x108] 86 00402120 . 52 push edx 87 00402121 . 8D4D DC lea ecx,dword ptr ss:[ebp-0x24] 88 00402124 . 50 push eax 89 00402125 . 51 push ecx 90 00402126 . FF15 20414000 call dword ptr ds:[<&MSVBVM50.__vbaVarForInit>] 91 0040212C . 8B3D 04414000 mov edi,dword ptr ds:[<&MSVBVM50.__vbaFreeVarList>] 92 00402132 > 85C0 test eax,eax ; 循环开始judge 93 00402134 . 0F84 9C000000 je Andréna.004021D6 94 0040213A . 8D55 94 lea edx,dword ptr ss:[ebp-0x6C] ; 寄存器赋予栈地址 edx=0012f474 95 0040213D . 8D45 DC lea eax,dword ptr ss:[ebp-0x24] ; eax=0012f4bc 96 00402140 . 52 push edx 97 00402141 . 50 push eax 98 00402142 . C745 9C 01000>mov dword ptr ss:[ebp-0x64],0x1 ; 0012f47c=1 99 00402149 . 895D 94 mov dword ptr ss:[ebp-0x6C],ebx ; 0012f474=ebx=02 100 0040214C . FF15 90414000 call dword ptr ds:[<&MSVBVM50.__vbaI4Var>] ; msvbvm50.__vbaI4Var 101 00402152 . 8D4D BC lea ecx,dword ptr ss:[ebp-0x44] ; ecx=0012f49c 102 00402155 . 50 push eax ; eax=1 103 00402156 . 8D55 84 lea edx,dword ptr ss:[ebp-0x7C] ; edx=0012f464 104 00402159 . 51 push ecx 105 0040215A . 52 push edx 106 0040215B . FF15 38414000 call dword ptr ds:[<&MSVBVM50.#632>] ; msvbvm50.rtcMidCharVar 107 00402161 . 8D45 84 lea eax,dword ptr ss:[ebp-0x7C] 108 00402164 . 8D4D A8 lea ecx,dword ptr ss:[ebp-0x58] 109 00402167 . 50 push eax 110 00402168 . 51 push ecx 111 00402169 . FF15 70414000 call dword ptr ds:[<&MSVBVM50.__vbaStrVarVal>] 112 0040216F . 50 push eax ; eax='w'取值 113 00402170 . FF15 0C414000 call dword ptr ds:[<&MSVBVM50.#516>] ; msvbvm50.rtcAnsiValueBstr 114 00402176 . 66:8985 4CFFF>mov word ptr ss:[ebp-0xB4],ax ; Unicode转变ansi,返回值eax 115 0040217D . 8D55 CC lea edx,dword ptr ss:[ebp-0x34] 116 00402180 . 8D85 44FFFFFF lea eax,dword ptr ss:[ebp-0xBC] 117 00402186 . 52 push edx 118 00402187 . 8D8D 74FFFFFF lea ecx,dword ptr ss:[ebp-0x8C] 119 0040218D . 50 push eax 120 0040218E . 51 push ecx 121 0040218F . 899D 44FFFFFF mov dword ptr ss:[ebp-0xBC],ebx ; 下列函数的返回值寄存在ecx 122 00402195 . FF15 94414000 call dword ptr ds:[<&MSVBVM50.__vbaVarAdd>]
124 0040219D . 8D4D CC lea ecx,dword ptr ss:[ebp-0x34] 125 004021A0 . FFD6 call esi 126 004021A2 . 8D4D A8 lea ecx,dword ptr ss:[ebp-0x58] ; 修改了ecx的值 127 004021A5 . FF15 B8414000 call dword ptr ds:[<&MSVBVM50.__vbaFreeStr>] 128 004021AB . 8D55 84 lea edx,dword ptr ss:[ebp-0x7C] 129 004021AE . 8D45 94 lea eax,dword ptr ss:[ebp-0x6C] 130 004021B1 . 52 push edx 131 004021B2 . 50 push eax 132 004021B3 . 53 push ebx 133 004021B4 . FFD7 call edi ; msvbvm50.__vbaFreeVarList 134 004021B6 . 83C4 0C add esp,0xC 135 004021B9 . 8D8D E8FEFFFF lea ecx,dword ptr ss:[ebp-0x118] 136 004021BF . 8D95 F8FEFFFF lea edx,dword ptr ss:[ebp-0x108] 137 004021C5 . 8D45 DC lea eax,dword ptr ss:[ebp-0x24] 138 004021C8 . 51 push ecx ; arg3 139 004021C9 . 52 push edx ; arg2 140 004021CA . 50 push eax ; arg1 141 004021CB . FF15 AC414000 call dword ptr ds:[<&MSVBVM50.__vbaVarForNext>] 142 004021D1 . E9 5CFFFFFF jmp Andréna.00402132 143 004021D6 > 8D4D CC lea ecx,dword ptr ss:[ebp-0x34] 144 004021D9 . 8D95 54FFFFFF lea edx,dword ptr ss:[ebp-0xAC] 145 004021DF . 51 push ecx ; name的计算值 146 004021E0 . 8D45 94 lea eax,dword ptr ss:[ebp-0x6C] 147 004021E3 . 52 push edx ; arg2 148 004021E4 . 50 push eax ; arg1 149 004021E5 . C785 5CFFFFFF>mov dword ptr ss:[ebp-0xA4],0x499602D2 ; 把1234567890推进栈地址 150 004021EF . C785 54FFFFFF>mov dword ptr ss:[ebp-0xAC],0x3 ; //两变量相乘 151 004021F9 . FF15 5C414000 call dword ptr ds:[<&MSVBVM50.__vbaVarMul>] 152 004021FF . 8BD0 mov edx,eax 153 00402201 . 8D4D CC lea ecx,dword ptr ss:[ebp-0x34] 154 00402204 . FFD6 call esi 155 00402206 . 8B1D A0414000 mov ebx,dword ptr ds:[<&MSVBVM50.__vbaMidStmtVar>] 156 0040220C . 8D4D CC lea ecx,dword ptr ss:[ebp-0x34] 157 0040220F . 51 push ecx 158 00402210 . 6A 04 push 0x4 159 00402212 . 8D95 54FFFFFF lea edx,dword ptr ss:[ebp-0xAC] 160 00402218 . 6A 01 push 0x1 161 0040221A . 52 push edx 162 0040221B . C785 5CFFFFFF>mov dword ptr ss:[ebp-0xA4],Andréna.00401C34 ; UNICODE "-" 163 00402225 . C785 54FFFFFF>mov dword ptr ss:[ebp-0xAC],0x8 164 0040222F . FFD3 call ebx ; <&MSVBVM50.__vbaMidStmtVar> 165 00402231 . 8D45 CC lea eax,dword ptr ss:[ebp-0x34] 166 00402234 . 8D8D 54FFFFFF lea ecx,dword ptr ss:[ebp-0xAC] 167 0040223A . 50 push eax 168 0040223B . 6A 09 push 0x9 169 0040223D . 6A 01 push 0x1 170 0040223F . 51 push ecx 171 00402240 . C785 5CFFFFFF>mov dword ptr ss:[ebp-0xA4],Andréna.00401C34 ; UNICODE "-" 172 0040224A . C785 54FFFFFF>mov dword ptr ss:[ebp-0xAC],0x8 173 00402254 . FFD3 call ebx 174 00402256 . 8B45 08 mov eax,dword ptr ss:[ebp+0x8] ; 取字符串（string, start, num） 175 00402259 . 50 push eax 176 0040225A . 8B10 mov edx,dword ptr ds:[eax] 177 0040225C . FF92 04030000 call dword ptr ds:[edx+0x304] 178 00402262 . 50 push eax 179 00402263 . 8D45 A4 lea eax,dword ptr ss:[ebp-0x5C] 180 00402266 . 50 push eax 181 00402267 . FF15 24414000 call dword ptr ds:[<&MSVBVM50.__vbaObjSet>] 182 0040226D . 8BD8 mov ebx,eax 183 0040226F . 8D55 A8 lea edx,dword ptr ss:[ebp-0x58] 184 00402272 . 52 push edx 185 00402273 . 53 push ebx 186 00402274 . 8B0B mov ecx,dword ptr ds:[ebx] 187 00402276 . FF91 A0000000 call dword ptr ds:[ecx+0xA0] 188 0040227C . 85C0 test eax,eax 189 0040227E . 7D 12 jge short Andréna.00402292 190 00402280 . 68 A0000000 push 0xA0 191 00402285 . 68 201C4000 push Andréna.00401C20 192 0040228A . 53 push ebx 193 0040228B . 50 push eax 194 0040228C . FF15 14414000 call dword ptr ds:[<&MSVBVM50.__vbaHresultCheckObj>] 195 00402292 > 8B45 A8 mov eax,dword ptr ss:[ebp-0x58] 196 00402295 . 8D4D CC lea ecx,dword ptr ss:[ebp-0x34] 197 00402298 . 8945 9C mov dword ptr ss:[ebp-0x64],eax 198 0040229B . 8D45 94 lea eax,dword ptr ss:[ebp-0x6C] ; lea指令用于取变量的地址 199 0040229E . 50 push eax 200 0040229F . 51 push ecx 201 004022A0 . C745 A8 00000>mov dword ptr ss:[ebp-0x58],0x0 202 004022A7 . C745 94 08800>mov dword ptr ss:[ebp-0x6C],0x8008 203 004022AE . FF15 48414000 call dword ptr ds:[<&MSVBVM50.__vbaVarTstEq>] 204 004022B4 . 8D4D A4 lea ecx,dword ptr ss:[ebp-0x5C] 205 004022B7 . 8BD8 mov ebx,eax 206 004022B9 . FF15 B4414000 call dword ptr ds:[<&MSVBVM50.__vbaFreeObj>] 207 004022BF . 8D4D 94 lea ecx,dword ptr ss:[ebp-0x6C] 208 004022C2 . FF15 00414000 call dword ptr ds:[<&MSVBVM50.__vbaFreeVar>] 209 004022C8 . 66:85DB test bx,bx 210 004022CB . 0F84 C0000000 je Andréna.00402391 ; 注册码关键跳 211 004022D1 . FF15 74414000 call dword ptr ds:[<&MSVBVM50.#534>] ; msvbvm50.rtcBeep 212 004022D7 . 8B1D 98414000 mov ebx,dword ptr ds:[<&MSVBVM50.__vbaVarDup>]
214 004022E2 . 898D 6CFFFFFF mov dword ptr ss:[ebp-0x94],ecx 215 004022E8 . B8 0A000000 mov eax,0xA 216 004022ED . 898D 7CFFFFFF mov dword ptr ss:[ebp-0x84],ecx 217 004022F3 . 8D95 44FFFFFF lea edx,dword ptr ss:[ebp-0xBC] 218 004022F9 . 8D4D 84 lea ecx,dword ptr ss:[ebp-0x7C] 219 004022FC . 8985 64FFFFFF mov dword ptr ss:[ebp-0x9C],eax 220 00402302 . 8985 74FFFFFF mov dword ptr ss:[ebp-0x8C],eax 221 00402308 . C785 4CFFFFFF>mov dword ptr ss:[ebp-0xB4],Andréna ; UNICODE "RiCHTiG !" 222 00402312 . C785 44FFFFFF>mov dword ptr ss:[ebp-0xBC],0x8 223 0040231C . FFD3 call ebx ; <&MSVBVM50.__vbaVarDup> 224 0040231E . 8D95 54FFFFFF lea edx,dword ptr ss:[ebp-0xAC] 225 226
一般情况分析VB程序，需要观察OD里面的汇编代码，栈区域，以及数据区域。在分析的过程中会大量的使用地址来传递参数（经常会有地址的地址这种方法来操作），要想真正能理解，那还是需要多做一些练习。
小白本白
