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[原创] KCTF 2019 Q1 第七题 混淆模式清除 与 随机位权大数规整
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发表于: 2019-3-24 01:08
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太绕，精力有限，这里只做部分分析
0x00 混淆清除
0x01 随机位权大数归整
0x00 混淆清除
用法，针对其八种混淆模型进行nop清除，以还原构建函数控制流
(1)IDAPython里复制粘贴下述所有代码
(2)然后鼠标定位再需要清除混淆的地方,IDAPython运行 cnop(0,1) （注意cnop(0,0)只列出混淆片段，不nop）
(3)cnop 参数1可以直接提供地址，地址最好选在模式之前，（否则会寻的不到)
(4)默认搜索长度是当前位置（若参数1为0）或参数1所提供地址开始的0x100长度代码区间，设计采用Original字节信息（GetOriginalByte函数，所以可以反复多次执行
(5）执行后，需要手动快捷键“u”（ 打回未定义原形
）与‘c’（启动片区代码分析）
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | def check_nop_call_add_esp_4(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" call_add_esp_list = [] for ea in e8_call_list: if Dword(ea+1) < 0x100: tea = ea+5+Dword(ea+1) if Dword(tea)&0xFFFFFF == 0x04C483: call_add_esp_list.append([ea,tea+3]) for s,e in call_add_esp_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M1: {:X} to {:X}".format(s,e)def check_nop_dualjmp(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 dualjmp = [[0x70,0x71],[0x72,0x73],[0x74,0x75],[0x76,0x77],[0x78,0x79],[0x7a,0x7b],[0x7C,0x7D], [0x7e,0x7f]] #jo,jno;jb,jnb;jz,jnz;jbe,ja;js,jns;jp,jnp;jl,jge; #jle,jg; while i < zonelen: for dj in dualjmp: if (Byte(ea+i) in dj) and (Byte(ea+i+2) in dj) and (Byte(ea+i+1)==(Byte(ea+i+3)+2)): mea_list.append(ea+i) i+=4 break else: i+=1 #check nop se_list = [] for ea in mea_list: se_list.append([ea,ea+2+Byte(ea+1)]) for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M2: {:X} to {:X}".format(s,e)def check_nop_push_call_pop_pop(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" push_call_pop_pop_list = [] for ea in e8_call_list: if (Byte(ea-1)==0x50) and (Dword(ea+1) < 0x100): tea = ea+5+Dword(ea+1) if Dword(tea)&0xFFFF == 0x5858: push_call_pop_pop_list.append([ea-1,tea+2]) for s,e in push_call_pop_pop_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M3: {:X} to {:X}".format(s,e)def check_nop_call_add_6(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" call_add_6_list = [] for ea in e8_call_list: if (Dword(ea+1) < 0x100): tea = ea+5+Dword(ea+1) if Qword(tea)&0xFFFFFFFFFF == 0xC306240483: call_add_6_list.append([ea,tea+5]) for s,e in call_add_6_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M4: {:X} to {:X}".format(s,e)def check_nop_flagjmp(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 flagjmp = [0x73F8,0x72F9] #clc,jnb;stc,jb while i < zonelen: if (Word(ea+i) in flagjmp) and (Byte(ea+i+2)<0x40): mea_list.append(ea+i) i+=3 else: i+=1 #check nop se_list = [] for ea in mea_list: se_list.append([ea,ea+3+Byte(ea+2)]) for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M5: {:X} to {:X}".format(s,e)def check_nop_jljmpjz(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 flagjmp = [0x73F8,0x72F9] #clc,jnb;stc,jb while i < zonelen: if Qword(ea+i)&0x00FFFF00FFFFFFFF == 0xFB740003EB037C: mea_list.append(ea+i) i+=7 else: i+=1 #check nop se_list = [] for ea in mea_list: se_list.append([ea,ea+7]) for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M6: {:X} to {:X}".format(s,e)def check_nop_4jmp(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 se_list = [] while i < zonelen: j1,o1,x1,j2,o2,x2,j3,o3,x3,j4,o4,x4 = struct.unpack("BbBBbBBbBBbB",get_bytes(ea+i,12)) if [j1,j2,j3,j4].count(0xEB) == 4: oo = [o1,o2,o3,o4] t1 = 2+oo[0] t2 = t1+2+oo[t1/3] t3 = t2+2+oo[t2/3] t4 = t3+2+oo[t3/3] t = ea+i+t4 se_list.append([ea+i,t]) i+=12 else: i+=1 #check nop for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M7: {:X} to {:X}".format(s,e)def check_nop_call_pop_inc_jjmpreg(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" mea_list = [] poplist = [0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F]#eax,ecx,edx,ebx,esp,ebp,esi,edi inclist = [0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47] jreglist = [0xE0FF,0xE1FF,0xE2FF,0xE3FF,0xE4FF,0xE5FF,0xE6FF,0xE7FF] for ea in e8_call_list: if(Dword(ea+1) < 0x100):#check call offset tea = ea+5+Dword(ea+1) #pop reg if Byte(tea) in poplist and Byte(tea+1) == 0xEB: pidx = poplist.index(Byte(tea)) pjmp_ea = tea+3+c_byte(Byte(tea+2)).value #inc reg if (Byte(pjmp_ea) in inclist) and (Byte(pjmp_ea+1) == 0xEB) and (inclist.index(Byte(pjmp_ea)) ==pidx): iidx = inclist.index(Byte(pjmp_ea)) ijmp_ea = pjmp_ea+3+c_byte(Byte(pjmp_ea+2)).value if (Word(ijmp_ea) in jreglist) and (jreglist.index(Word(ijmp_ea)) == pidx): cjea = ea+5+1 rea = cjea + 2 + c_byte(Byte(cjea+1)).value mea_list.append([ea,rea]) for s,e in mea_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M8: {:X} to {:X}".format(s,e)def cnop(ea=0,b=False,zonelen = 0x100): check_nop_4jmp(ea,b,zonelen) check_nop_jljmpjz(ea,b,zonelen) check_nop_flagjmp(ea,b,zonelen) check_nop_call_add_6(ea,b,zonelen) check_nop_call_add_esp_4(ea,b,zonelen) check_nop_dualjmp(ea,b,zonelen) check_nop_push_call_pop_pop(ea,b,zonelen) check_nop_call_pop_inc_jjmpreg(ea,b,zonelen) |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | def check_nop_call_add_esp_4(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" call_add_esp_list = [] for ea in e8_call_list: if Dword(ea+1) < 0x100: tea = ea+5+Dword(ea+1) if Dword(tea)&0xFFFFFF == 0x04C483: call_add_esp_list.append([ea,tea+3]) for s,e in call_add_esp_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M1: {:X} to {:X}".format(s,e)def check_nop_dualjmp(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 dualjmp = [[0x70,0x71],[0x72,0x73],[0x74,0x75],[0x76,0x77],[0x78,0x79],[0x7a,0x7b],[0x7C,0x7D], [0x7e,0x7f]] #jo,jno;jb,jnb;jz,jnz;jbe,ja;js,jns;jp,jnp;jl,jge; #jle,jg; while i < zonelen: for dj in dualjmp: if (Byte(ea+i) in dj) and (Byte(ea+i+2) in dj) and (Byte(ea+i+1)==(Byte(ea+i+3)+2)): mea_list.append(ea+i) i+=4 break else: i+=1 #check nop se_list = [] for ea in mea_list: se_list.append([ea,ea+2+Byte(ea+1)]) for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M2: {:X} to {:X}".format(s,e)def check_nop_push_call_pop_pop(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" push_call_pop_pop_list = [] for ea in e8_call_list: if (Byte(ea-1)==0x50) and (Dword(ea+1) < 0x100): tea = ea+5+Dword(ea+1) if Dword(tea)&0xFFFF == 0x5858: push_call_pop_pop_list.append([ea-1,tea+2]) for s,e in push_call_pop_pop_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M3: {:X} to {:X}".format(s,e)def check_nop_call_add_6(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" call_add_6_list = [] for ea in e8_call_list: if (Dword(ea+1) < 0x100): tea = ea+5+Dword(ea+1) if Qword(tea)&0xFFFFFFFFFF == 0xC306240483: call_add_6_list.append([ea,tea+5]) for s,e in call_add_6_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M4: {:X} to {:X}".format(s,e)def check_nop_flagjmp(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 flagjmp = [0x73F8,0x72F9] #clc,jnb;stc,jb while i < zonelen: if (Word(ea+i) in flagjmp) and (Byte(ea+i+2)<0x40): mea_list.append(ea+i) i+=3 else: i+=1 #check nop se_list = [] for ea in mea_list: se_list.append([ea,ea+3+Byte(ea+2)]) for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M5: {:X} to {:X}".format(s,e)def check_nop_jljmpjz(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 flagjmp = [0x73F8,0x72F9] #clc,jnb;stc,jb while i < zonelen: if Qword(ea+i)&0x00FFFF00FFFFFFFF == 0xFB740003EB037C: mea_list.append(ea+i) i+=7 else: i+=1 #check nop se_list = [] for ea in mea_list: se_list.append([ea,ea+7]) for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M6: {:X} to {:X}".format(s,e)def check_nop_4jmp(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() mea_list = [] i = 0 se_list = [] while i < zonelen: j1,o1,x1,j2,o2,x2,j3,o3,x3,j4,o4,x4 = struct.unpack("BbBBbBBbBBbB",get_bytes(ea+i,12)) if [j1,j2,j3,j4].count(0xEB) == 4: oo = [o1,o2,o3,o4] t1 = 2+oo[0] t2 = t1+2+oo[t1/3] t3 = t2+2+oo[t2/3] t4 = t3+2+oo[t3/3] t = ea+i+t4 se_list.append([ea+i,t]) i+=12 else: i+=1 #check nop for s,e in se_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M7: {:X} to {:X}".format(s,e)def check_nop_call_pop_inc_jjmpreg(ea = 0,bnop = False,zonelen = 0x100): if ea == 0: ea = ScreenEA() e8_call_list = [] i = 0 while i < zonelen: if Byte(ea+i)==0xE8: e8_call_list.append(ea+i) i+=5 else: i+=1 #check if is "call to add esp,4" mea_list = [] poplist = [0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F]#eax,ecx,edx,ebx,esp,ebp,esi,edi inclist = [0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47] jreglist = [0xE0FF,0xE1FF,0xE2FF,0xE3FF,0xE4FF,0xE5FF,0xE6FF,0xE7FF] for ea in e8_call_list: if(Dword(ea+1) < 0x100):#check call offset tea = ea+5+Dword(ea+1) #pop reg if Byte(tea) in poplist and Byte(tea+1) == 0xEB: pidx = poplist.index(Byte(tea)) pjmp_ea = tea+3+c_byte(Byte(tea+2)).value #inc reg if (Byte(pjmp_ea) in inclist) and (Byte(pjmp_ea+1) == 0xEB) and (inclist.index(Byte(pjmp_ea)) ==pidx): iidx = inclist.index(Byte(pjmp_ea)) ijmp_ea = pjmp_ea+3+c_byte(Byte(pjmp_ea+2)).value if (Word(ijmp_ea) in jreglist) and (jreglist.index(Word(ijmp_ea)) == pidx): cjea = ea+5+1 rea = cjea + 2 + c_byte(Byte(cjea+1)).value mea_list.append([ea,rea]) for s,e in mea_list: if bnop: for ea in range(s,e): PatchByte(ea,0x90) print "M8: {:X} to {:X}".format(s,e)def cnop(ea=0,b=False,zonelen = 0x100): check_nop_4jmp(ea,b,zonelen) check_nop_jljmpjz(ea,b,zonelen) check_nop_flagjmp(ea,b,zonelen) check_nop_call_add_6(ea,b,zonelen) check_nop_call_add_esp_4(ea,b,zonelen) check_nop_dualjmp(ea,b,zonelen) check_nop_push_call_pop_pop(ea,b,zonelen) check_nop_call_pop_inc_jjmpreg(ea,b,zonelen) |
如，以下是清除混淆后，主函数main的F5伪码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 | int __cdecl main(int argc,const char**argv,const char**envp){ myvect*v3;// ebx myvect*v4;// edi int v5;// esi void*v6;// esp myvect*v7;// ecx int v8;// eax int v9;// edx int v10;// eax char*v11;// ebx myvect*v12;// esi char*v13;// edx char v14;// ah char v15;// dl int v16;// eax DWORD v17;// eax myvect*v18;// edx DWORD v19;// ebx int v20;// eax int v21;// ebx DWORD v22;// eax int v23;// edx int v24;// edx int v25;// ecx signed int v26;// eax int(*v27)();// eax DWORD v28;// ebx __int64 v29;// rax __int64 v30;// rax char v31;// al myvect*v32;// edx int v33;// eax int v34;// ST20_4 unsigned __int8*v35;// ST1C_4 int v36;// eax _BYTE*v37;// ecx int v38;// eax int v39;// ebx int v40;// edx int v41;// eax int v42;// edx int v44;// [esp+4h] [ebp-2BDCh] int v45;// [esp+8h] [ebp-2BD8h] int loc_off1;// [esp+Ch] [ebp-2BD4h] int loc_keydidx;// [esp+10h] [ebp-2BD0h] int loc_srcBigNum_idx;// [esp+14h] [ebp-2BCCh] int loc_tmp;// [esp+18h] [ebp-2BC8h] int v50;// [esp+18h] [ebp-2BC8h] int loc_gbnidx;// [esp+1Ch] [ebp-2BC4h] signed int loc_ii_0_to_ValSub9;// [esp+20h] [ebp-2BC0h] signed int loc_BitWeightVal;// [esp+24h] [ebp-2BBCh] int loc_BitWeightVal_var_2BBCa;// [esp+24h] [ebp-2BBCh] myvect*loc_BitWeightVal_var_2BBCb;// [esp+24h] [ebp-2BBCh] int loc_vocidx_0x4F;// [esp+28h] [ebp-2BB8h] myvect*v57;// [esp+28h] [ebp-2BB8h] int v58;// [esp+28h] [ebp-2BB8h] int loc_watch1;// [esp+2Ch] [ebp-2BB4h] int loc_watch1a;// [esp+2Ch] [ebp-2BB4h] signed int loc_watch1b;// [esp+2Ch] [ebp-2BB4h] int loc_watch1c;// [esp+2Ch] [ebp-2BB4h] int loc_keylen;// [esp+30h] [ebp-2BB0h] char v64;// [esp+34h] [ebp-2BACh] int loc_tryl;// [esp+38h] [ebp-2BA8h] int(__cdecl*v66)(int,int,int,int,int,int);// [esp+4Ch] [ebp-2B94h] int*v67;// [esp+50h] [ebp-2B90h] myvect**v68;// [esp+54h] [ebp-2B8Ch] void*v69;// [esp+58h] [ebp-2B88h] myvect**v70;// [esp+5Ch] [ebp-2B84h] myvect loc_vect_V0C;// [esp+68h] [ebp-2B78h] int v72;// [esp+74h] [ebp-2B6Ch] myvect loc_vect_buf510;// [esp+80h] [ebp-2B60h] myvect nlw;// [esp+8Ch] [ebp-2B54h] char loc_keystr[256];// [esp+A8h] [ebp-2B38h] char loc_keyh[256];// [esp+1A8h] [ebp-2A38h] char loc_keyd[256];// [esp+2A8h] [ebp-2938h] char loc_BitNum1[5136];// [esp+3A8h] [ebp-2838h] char loc_BitNum2[5136];// [esp+17B8h] [ebp-1428h] myvect*var_18;// [esp+2BC8h] [ebp-18h] myvect*v81;// [esp+2BCCh] [ebp-14h] int v82;// [esp+2BD0h] [ebp-10h] myvect*v83;// [esp+2BD4h] [ebp-Ch] int*v84;// [esp+2BD8h] [ebp-8h] int v85;// [esp+2BDCh] [ebp-4h] int retaddr;// [esp+2BE0h] [ebp+0h] v85=retaddr; v84=&retaddr; v83=v4; v82=v5; v81=v3; v6=alloca(Hi_stack_alloc((unsigned int)&argc)); v66=sub_4B85B0; v67=dword_4B9D1C; v69=&unk_4B9827; v68=&var_18; v70=&var_18; Hi_esp_check_in(&v64); sub_40C510(); Hi_set_debuginfo_sub_40299C(4096); Hi_ecx_BitNum_ClockRandBitWeight(loc_BitNum1); Hi_ecx_BitNum_ClockRandBitWeight(loc_BitNum2); loc_tryl=2; Hi_like_scanf_key(&Hi_input_io,loc_keystr); for(loc_keylen=0;;++loc_keylen) { v8=loc_keylen; if(!loc_keystr[loc_keylen]) break; } v9=0; LOBYTE(v3)=55; while(v9!=loc_keylen) { LOBYTE(v8)=loc_keystr[v9]; LOBYTE(v7)=48; if((char)v8>57) { LOBYTE(v7)=61; if((char)v8<'a' ) v7=v3; } v10=v8-(_DWORD)v7; loc_keyh[v9]=v10; v8=v10-1; if((unsigned __int8)v8>0xEu) goto LABEL_61; ++v9; } v11=loc_keyd; v12=(myvect*)loc_keyh; loc_keyh[loc_keylen]=0; while(loc_keylen) { v13=&loc_keyh[loc_keylen]; do { v14=(unsigned __int8)*v13%0xAu; *v13=(unsigned __int8)*v13/0xAu; *(v13---1)+=16*v14; } while(loc_keyh!=v13); v15=loc_keyh[0]%0xAu; loc_keyh[0]/=0xAu; *v11=v15; do { v4=(myvect*)loc_keylen; v16=loc_keylen-1; if(loc_keyh[loc_keylen-1]) break; --loc_keylen; } while(v16); ++v11; } loc_tryl=2; Hi_BitNum_ctor_P1bytes_P2Radix(&Hi_BigNum1_hbytes,16); v81=(myvect*)Hi_BitNum_ctor_P1bytes_P2Radix(&Hi_BigNum2_hbytes,16); Hi_ecx_BitNum_eq_ECX_mul_P1(loc_BitNum2); Hi_ecx_BitNum_radix_0Ah_to_10h(loc_BitNum1,v4); loc_vect_V0C.first=0; loc_vect_V0C.last=0; loc_vect_V0C.tail=0; loc_keydidx=0; loc_gbnidx=0; loc_srcBigNum_idx=0; loc_vocidx_0x4F=0; while(1) { loc_tryl=3; if(loc_srcBigNum_idx>=Hi_ecx_BitNum_get_BitCnt(loc_BitNum1)) break; loc_BitWeightVal=Hi_ecx_BitNum_get_BitWeightVal(loc_srcBigNum_idx); loc_vect_buf510.last=0; v17=Hi_malloc(0x510); v18=(myvect*)(v17+0x510); v19=v17; loc_vect_buf510.first=v17; v20=0; loc_vect_buf510.tail=(DWORD)v18; do { *(_DWORD*)(v19+v20)=0; v20+=4; } while(v20!=0x510); loc_vect_buf510.last=(DWORD)v18; if(loc_BitWeightVal) { if(loc_BitWeightVal<=9) { v30=loc_vocidx_0x4F; *(_DWORD*)(v19+4*v30)=1; *(_DWORD*)(v19+4*(loc_BitWeightVal+9*(unsigned __int64)(v30/9)+80))=1; v4=(myvect*)3; *(_DWORD*)(v19+4*(loc_BitWeightVal+9*(loc_vocidx_0x4F%9)+161))=1; v12=(myvect*)loc_BitWeightVal; *(_DWORD*)(v19+4*(loc_BitWeightVal+9*(3*(loc_vocidx_0x4F/27)+loc_vocidx_0x4F%9/3)+242))=1; loc_tryl=4; Hi_ecx_vect_0C_add_EleVect0Ch(&loc_vect_buf510); loc_tmp=loc_gbnidx+1; v81=(myvect*)Hi_ecx_BitNum_set_P1BitWeightIdx_P2value(loc_gbnidx,loc_BitWeightVal); var_18=v81; ++loc_vocidx_0x4F; } else { for(loc_ii_0_to_ValSub9=0;;++loc_ii_0_to_ValSub9) { loc_tmp=loc_ii_0_to_ValSub9+loc_gbnidx; loc_watch1=loc_ii_0_to_ValSub9+loc_vocidx_0x4F; if(loc_ii_0_to_ValSub9>=loc_BitWeightVal-9) break; v81=(myvect*)(unsigned __int8)loc_keyd[loc_keydidx+loc_ii_0_to_ValSub9]; loc_tryl=4; Hi_ecx_BitNum_set_P1BitWeightIdx_P2value(loc_tmp,v81); v81=(myvect*)loc_ii_0_to_ValSub9; var_18=(myvect*)loc_ii_0_to_ValSub9; loc_off1=4*loc_watch1; v21=9*(loc_watch1/9); v50=36*(loc_watch1/9)+0x144; v44=36*(loc_watch1/9)+0x168; v45=4*(9*(loc_watch1%9)-v21); loc_watch1a=4*(9*(loc_watch1%9/3+3*(loc_watch1/27))-v21); do { nlw.last=0; loc_tryl=4; v22=Hi_malloc(1296); nlw.first=v22; v23=0; nlw.tail=v22+1296; do { *(_DWORD*)(v22+v23)=0; v23+=4; } while(v23!=1296); v4=(myvect*)v50; nlw.last=v22+1296; *(_DWORD*)(v22+loc_off1)=1; *(_DWORD*)(v22+v50)=1; *(_DWORD*)(v50+v22+v45+324)=1; *(_DWORD*)(v50+loc_watch1a+v22+648)=1; loc_tryl=5; Hi_ecx_vect_0C_add_EleVect0Ch(&nlw); Hi_vect_release(&nlw,v24,v25); v50+=4; v12=(myvect*)v50; } while(v44!=v50); } loc_tryl=4; v26=Hi_ecx_BitNum_get_BitWeightVal(loc_srcBigNum_idx+1); var_18=v18; if(v26<=9) { loc_keydidx+=loc_ii_0_to_ValSub9; loc_vocidx_0x4F+=loc_ii_0_to_ValSub9; } else { v57=NULL; loc_BitWeightVal_var_2BBCa=0; do { v27=anti_debug_funcarray_off_4BC020[loc_BitWeightVal_var_2BBCa]; loc_tryl=4; v57=(myvect*)((char*)v57+((unsigned int)((int(__cdecl*)(myvect*))v27)(var_18)<1)); ++loc_BitWeightVal_var_2BBCa; } while(loc_BitWeightVal_var_2BBCa!=9); v28=loc_vect_buf510.first; v29=loc_watch1; *(_DWORD*)(loc_vect_buf510.first+4*v29)=1; *(_DWORD*)(v28+4*((_DWORD)v57+9*(unsigned __int64)(v29/9)+80))=1; v4=(myvect*)3; *(_DWORD*)(v28+4*((_DWORD)v57+9*(loc_watch1%9)+161))=1; v12=v57; *(_DWORD*)(v28+4*((_DWORD)v57+9*(3*(loc_watch1/27)+loc_watch1%9/3)+242))=1; loc_tryl=4; var_18=(myvect*)Hi_ecx_vect_0C_add_EleVect0Ch(&loc_vect_buf510); loc_vocidx_0x4F=loc_watch1+1; loc_keydidx+=loc_ii_0_to_ValSub9; } } } else { loc_tmp=loc_gbnidx; } Hi_vect_release(&loc_vect_buf510,v18,var_18); ++loc_srcBigNum_idx; loc_gbnidx=loc_tmp; } Hi_ecx_00h_vectV0C_eq_dowith_P1vectV0C_P2cnt_P3_0x144( &loc_vect_V0C, -1431655765*((signed int)(loc_vect_V0C.last-loc_vect_V0C.first)>>2), 324); loc_tryl=6; v31=sub_402DB6(0); var_18=v4; if(v31) { loc_tryl=6; Hi_myvect_ecx_ctor_P1((myvect*)((char*)&nlw+4)); var_18=v12; v58=0; loc_BitWeightVal_var_2BBCb=NULL; do { var_18=(myvect*)(loc_vect_V0C.first+12*(*(DWORD*)((char*)&loc_BitWeightVal_var_2BBCb->first+v72)-1)); loc_tryl=8; Hi_myvect_ecx_ctor_P1(var_18); var_18=loc_BitWeightVal_var_2BBCb; v32=(myvect*)loc_vect_buf510.first; loc_watch1b=0; do { if(*(_DWORD*)(loc_vect_buf510.first+4*loc_watch1b)==1) break; ++loc_watch1b; } while(loc_watch1b!=81); if(loc_watch1b==40) { --v58; } else { loc_watch1c=loc_watch1b-(loc_watch1b>=41); v33=0; do { if(*(_DWORD*)(loc_vect_buf510.first+4*v33+324)==1) break; ++v33; } while(v33!=81); v34=v33%9+1; loc_tryl=7; Hi_ecx_BitNum_get_BitWeightVal(loc_watch1c); v35=(unsigned __int8*)off_4BC060; v36=Hi_ecx_BitNum_get_BitWeightVal(loc_watch1c); var_18=v32; v58+=v34==v35[v36]; } Hi_vect_release(&loc_vect_buf510,v32,var_18); loc_BitWeightVal_var_2BBCb=(myvect*)((char*)loc_BitWeightVal_var_2BBCb+4); } while(loc_BitWeightVal_var_2BBCb!=(myvect*)324); v37=off_4BC05C; v38=0; do { v39=(unsigned __int8)v37[v38]; loc_keylen+=9*(v39^v58)^0x37; v40=v39^v58; v37[v38]=v39^v58; if(v58==v39) break; ++v38; } while(v38!=513); if(loc_keylen==7962) { loc_tryl=8; v41=sub_4B3F00(&dword_4BD9A0,(char*)off_4BC05C); sub_4B0DB0(v41); } Hi_vect_release(&v72,v40,var_18); } j_free(nlw.first); Hi_vect_release(&nlw.last,v42,var_18); sub_402966(&loc_vect_V0C);LABEL_61: sub_401570(loc_BitNum2); sub_401570(loc_BitNum1); Hi_esp_check_out(&v64); return 0;} |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 | int __cdecl main(int argc,const char**argv,const char**envp){ myvect*v3;// ebx myvect*v4;// edi int v5;// esi void*v6;// esp myvect*v7;// ecx int v8;// eax int v9;// edx int v10;// eax char*v11;// ebx myvect*v12;// esi char*v13;// edx char v14;// ah char v15;// dl int v16;// eax DWORD v17;// eax myvect*v18;// edx DWORD v19;// ebx int v20;// eax int v21;// ebx DWORD v22;// eax int v23;// edx int v24;// edx int v25;// ecx signed int v26;// eax int(*v27)();// eax DWORD v28;// ebx __int64 v29;// rax __int64 v30;// rax char v31;// al myvect*v32;// edx int v33;// eax int v34;// ST20_4 unsigned __int8*v35;// ST1C_4 int v36;// eax _BYTE*v37;// ecx int v38;// eax int v39;// ebx int v40;// edx int v41;// eax int v42;// edx int v44;// [esp+4h] [ebp-2BDCh] int v45;// [esp+8h] [ebp-2BD8h] int loc_off1;// [esp+Ch] [ebp-2BD4h] int loc_keydidx;// [esp+10h] [ebp-2BD0h] int loc_srcBigNum_idx;// [esp+14h] [ebp-2BCCh] int loc_tmp;// [esp+18h] [ebp-2BC8h] int v50;// [esp+18h] [ebp-2BC8h] int loc_gbnidx;// [esp+1Ch] [ebp-2BC4h] signed int loc_ii_0_to_ValSub9;// [esp+20h] [ebp-2BC0h] signed int loc_BitWeightVal;// [esp+24h] [ebp-2BBCh] int loc_BitWeightVal_var_2BBCa;// [esp+24h] [ebp-2BBCh] myvect*loc_BitWeightVal_var_2BBCb;// [esp+24h] [ebp-2BBCh] int loc_vocidx_0x4F;// [esp+28h] [ebp-2BB8h] myvect*v57;// [esp+28h] [ebp-2BB8h] int v58;// [esp+28h] [ebp-2BB8h] int loc_watch1;// [esp+2Ch] [ebp-2BB4h] int loc_watch1a;// [esp+2Ch] [ebp-2BB4h] signed int loc_watch1b;// [esp+2Ch] [ebp-2BB4h] int loc_watch1c;// [esp+2Ch] [ebp-2BB4h] int loc_keylen;// [esp+30h] [ebp-2BB0h] char v64;// [esp+34h] [ebp-2BACh] int loc_tryl;// [esp+38h] [ebp-2BA8h] int(__cdecl*v66)(int,int,int,int,int,int);// [esp+4Ch] [ebp-2B94h] int*v67;// [esp+50h] [ebp-2B90h] myvect**v68;// [esp+54h] [ebp-2B8Ch] void*v69;// [esp+58h] [ebp-2B88h] myvect**v70;// [esp+5Ch] [ebp-2B84h] myvect loc_vect_V0C;// [esp+68h] [ebp-2B78h] int v72;// [esp+74h] [ebp-2B6Ch] myvect loc_vect_buf510;// [esp+80h] [ebp-2B60h] myvect nlw;// [esp+8Ch] [ebp-2B54h] char loc_keystr[256];// [esp+A8h] [ebp-2B38h] char loc_keyh[256];// [esp+1A8h] [ebp-2A38h] char loc_keyd[256];// [esp+2A8h] [ebp-2938h] char loc_BitNum1[5136];// [esp+3A8h] [ebp-2838h] char loc_BitNum2[5136];// [esp+17B8h] [ebp-1428h] myvect*var_18;// [esp+2BC8h] [ebp-18h] myvect*v81;// [esp+2BCCh] [ebp-14h] int v82;// [esp+2BD0h] [ebp-10h] myvect*v83;// [esp+2BD4h] [ebp-Ch] int*v84;// [esp+2BD8h] [ebp-8h] int v85;// [esp+2BDCh] [ebp-4h] int retaddr;// [esp+2BE0h] [ebp+0h] v85=retaddr; v84=&retaddr; v83=v4; v82=v5; v81=v3; v6=alloca(Hi_stack_alloc((unsigned int)&argc)); v66=sub_4B85B0; v67=dword_4B9D1C; v69=&unk_4B9827; v68=&var_18; v70=&var_18; Hi_esp_check_in(&v64); sub_40C510(); Hi_set_debuginfo_sub_40299C(4096); Hi_ecx_BitNum_ClockRandBitWeight(loc_BitNum1); Hi_ecx_BitNum_ClockRandBitWeight(loc_BitNum2); loc_tryl=2; Hi_like_scanf_key(&Hi_input_io,loc_keystr); for(loc_keylen=0;;++loc_keylen) { v8=loc_keylen; if(!loc_keystr[loc_keylen]) break; } v9=0; LOBYTE(v3)=55; while(v9!=loc_keylen) { LOBYTE(v8)=loc_keystr[v9]; LOBYTE(v7)=48; if((char)v8>57) { LOBYTE(v7)=61; if((char)v8<'a' ) v7=v3; } v10=v8-(_DWORD)v7; loc_keyh[v9]=v10; v8=v10-1; if((unsigned __int8)v8>0xEu) goto LABEL_61; ++v9; } v11=loc_keyd; v12=(myvect*)loc_keyh; loc_keyh[loc_keylen]=0; while(loc_keylen) { v13=&loc_keyh[loc_keylen]; do { v14=(unsigned __int8)*v13%0xAu; *v13=(unsigned __int8)*v13/0xAu; *(v13---1)+=16*v14; } while(loc_keyh!=v13); v15=loc_keyh[0]%0xAu; loc_keyh[0]/=0xAu; *v11=v15; do { v4=(myvect*)loc_keylen; v16=loc_keylen-1; if(loc_keyh[loc_keylen-1]) break; --loc_keylen; } while(v16); ++v11; } loc_tryl=2; Hi_BitNum_ctor_P1bytes_P2Radix(&Hi_BigNum1_hbytes,16); v81=(myvect*)Hi_BitNum_ctor_P1bytes_P2Radix(&Hi_BigNum2_hbytes,16); Hi_ecx_BitNum_eq_ECX_mul_P1(loc_BitNum2); Hi_ecx_BitNum_radix_0Ah_to_10h(loc_BitNum1,v4); loc_vect_V0C.first=0; loc_vect_V0C.last=0; loc_vect_V0C.tail=0; loc_keydidx=0; loc_gbnidx=0; loc_srcBigNum_idx=0; loc_vocidx_0x4F=0; while(1) { loc_tryl=3; if(loc_srcBigNum_idx>=Hi_ecx_BitNum_get_BitCnt(loc_BitNum1)) break; loc_BitWeightVal=Hi_ecx_BitNum_get_BitWeightVal(loc_srcBigNum_idx); loc_vect_buf510.last=0; v17=Hi_malloc(0x510); v18=(myvect*)(v17+0x510); v19=v17; loc_vect_buf510.first=v17; v20=0; loc_vect_buf510.tail=(DWORD)v18; do { *(_DWORD*)(v19+v20)=0; v20+=4; } while(v20!=0x510); loc_vect_buf510.last=(DWORD)v18; if(loc_BitWeightVal) { if(loc_BitWeightVal<=9) { v30=loc_vocidx_0x4F; *(_DWORD*)(v19+4*v30)=1; *(_DWORD*)(v19+4*(loc_BitWeightVal+9*(unsigned __int64)(v30/9)+80))=1; v4=(myvect*)3; *(_DWORD*)(v19+4*(loc_BitWeightVal+9*(loc_vocidx_0x4F%9)+161))=1; v12=(myvect*)loc_BitWeightVal; *(_DWORD*)(v19+4*(loc_BitWeightVal+9*(3*(loc_vocidx_0x4F/27)+loc_vocidx_0x4F%9/3)+242))=1; loc_tryl=4; Hi_ecx_vect_0C_add_EleVect0Ch(&loc_vect_buf510); loc_tmp=loc_gbnidx+1; v81=(myvect*)Hi_ecx_BitNum_set_P1BitWeightIdx_P2value(loc_gbnidx,loc_BitWeightVal); var_18=v81; ++loc_vocidx_0x4F; } else { for(loc_ii_0_to_ValSub9=0;;++loc_ii_0_to_ValSub9) { loc_tmp=loc_ii_0_to_ValSub9+loc_gbnidx; loc_watch1=loc_ii_0_to_ValSub9+loc_vocidx_0x4F; if(loc_ii_0_to_ValSub9>=loc_BitWeightVal-9) break; v81=(myvect*)(unsigned __int8)loc_keyd[loc_keydidx+loc_ii_0_to_ValSub9]; loc_tryl=4; Hi_ecx_BitNum_set_P1BitWeightIdx_P2value(loc_tmp,v81); v81=(myvect*)loc_ii_0_to_ValSub9; var_18=(myvect*)loc_ii_0_to_ValSub9; loc_off1=4*loc_watch1; v21=9*(loc_watch1/9); v50=36*(loc_watch1/9)+0x144; v44=36*(loc_watch1/9)+0x168; v45=4*(9*(loc_watch1%9)-v21); loc_watch1a=4*(9*(loc_watch1%9/3+3*(loc_watch1/27))-v21); do { nlw.last=0; loc_tryl=4; v22=Hi_malloc(1296); nlw.first=v22; v23=0; nlw.tail=v22+1296; do { *(_DWORD*)(v22+v23)=0; v23+=4; } while(v23!=1296); v4=(myvect*)v50; nlw.last=v22+1296; *(_DWORD*)(v22+loc_off1)=1; *(_DWORD*)(v22+v50)=1; *(_DWORD*)(v50+v22+v45+324)=1; *(_DWORD*)(v50+loc_watch1a+v22+648)=1; loc_tryl=5; Hi_ecx_vect_0C_add_EleVect0Ch(&nlw); Hi_vect_release(&nlw,v24,v25); v50+=4; v12=(myvect*)v50; } while(v44!=v50); } loc_tryl=4; v26=Hi_ecx_BitNum_get_BitWeightVal(loc_srcBigNum_idx+1); var_18=v18; if(v26<=9) { loc_keydidx+=loc_ii_0_to_ValSub9; loc_vocidx_0x4F+=loc_ii_0_to_ValSub9; } else { v57=NULL; loc_BitWeightVal_var_2BBCa=0; do { v27=anti_debug_funcarray_off_4BC020[loc_BitWeightVal_var_2BBCa]; loc_tryl=4; v57=(myvect*)((char*)v57+((unsigned int)((int(__cdecl*)(myvect*))v27)(var_18)<1)); ++loc_BitWeightVal_var_2BBCa; } while(loc_BitWeightVal_var_2BBCa!=9); v28=loc_vect_buf510.first; v29=loc_watch1; *(_DWORD*)(loc_vect_buf510.first+4*v29)=1; *(_DWORD*)(v28+4*((_DWORD)v57+9*(unsigned __int64)(v29/9)+80))=1; v4=(myvect*)3; *(_DWORD*)(v28+4*((_DWORD)v57+9*(loc_watch1%9)+161))=1; v12=v57; *(_DWORD*)(v28+4*((_DWORD)v57+9*(3*(loc_watch1/27)+loc_watch1%9/3)+242))=1; loc_tryl=4; var_18=(myvect*)Hi_ecx_vect_0C_add_EleVect0Ch(&loc_vect_buf510); loc_vocidx_0x4F=loc_watch1+1; loc_keydidx+=loc_ii_0_to_ValSub9; } } } else { loc_tmp=loc_gbnidx; } Hi_vect_release(&loc_vect_buf510,v18,var_18); ++loc_srcBigNum_idx; loc_gbnidx=loc_tmp; } Hi_ecx_00h_vectV0C_eq_dowith_P1vectV0C_P2cnt_P3_0x144( &loc_vect_V0C, -1431655765*((signed int)(loc_vect_V0C.last-loc_vect_V0C.first)>>2), 324); loc_tryl=6; v31=sub_402DB6(0); var_18=v4; if(v31) { loc_tryl=6; Hi_myvect_ecx_ctor_P1((myvect*)((char*)&nlw+4)); var_18=v12; v58=0; loc_BitWeightVal_var_2BBCb=NULL; do { var_18=(myvect*)(loc_vect_V0C.first+12*(*(DWORD*)((char*)&loc_BitWeightVal_var_2BBCb->first+v72)-1)); loc_tryl=8; Hi_myvect_ecx_ctor_P1(var_18); var_18=loc_BitWeightVal_var_2BBCb; v32=(myvect*)loc_vect_buf510.first; loc_watch1b=0; do { if(*(_DWORD*)(loc_vect_buf510.first+4*loc_watch1b)==1) break; ++loc_watch1b; } while(loc_watch1b!=81); if(loc_watch1b==40) { --v58; } else { loc_watch1c=loc_watch1b-(loc_watch1b>=41); v33=0; do { if(*(_DWORD*)(loc_vect_buf510.first+4*v33+324)==1) break; ++v33; } while(v33!=81); v34=v33%9+1; loc_tryl=7; Hi_ecx_BitNum_get_BitWeightVal(loc_watch1c); v35=(unsigned __int8*)off_4BC060; v36=Hi_ecx_BitNum_get_BitWeightVal(loc_watch1c); var_18=v32; v58+=v34==v35[v36]; } Hi_vect_release(&loc_vect_buf510,v32,var_18); loc_BitWeightVal_var_2BBCb=(myvect*)((char*)loc_BitWeightVal_var_2BBCb+4); } while(loc_BitWeightVal_var_2BBCb!=(myvect*)324); v37=off_4BC05C; v38=0; do { v39=(unsigned __int8)v37[v38]; loc_keylen+=9*(v39^v58)^0x37; v40=v39^v58; v37[v38]=v39^v58; if(v58==v39) break; ++v38; } while(v38!=513); if(loc_keylen==7962) { loc_tryl=8; v41=sub_4B3F00(&dword_4BD9A0,(char*)off_4BC05C); sub_4B0DB0(v41); } Hi_vect_release(&v72,v40,var_18); } j_free(nlw.first); Hi_vect_release(&nlw.last,v42,var_18); sub_402966(&loc_vect_V0C);LABEL_61: sub_401570(loc_BitNum2); sub_401570(loc_BitNum1); Hi_esp_check_out(&v64); return 0;} |
0x02 随机位权大数的规整
随机位权大数的内存布局如
1 2 3 4 5 6 7 8 9 10 11 | BigNum{ .00 vft .04hww.BitCnt .08h.RandBitWeightSeq ww[0x400]&0xFF [::-1] .408h.BitExp2BitWeightPosTbl ww[0x400] cbSize:0x1000 // BitPos orgin = 0,1,2,...,0x3FF orgin[0,1,2,...,0x3FF] = orgin[rand_s(clock_rand)] .1408hww clock_rand .140Chww clock_rand} |
大数的多项式表示，表示为不同基数幂与系数的乘积和
1 2 3 4 5 6 7 8 9 10 11 | BigNum{ .00 vft .04hww.BitCnt .08h.RandBitWeightSeq ww[0x400]&0xFF [::-1] .408h.BitExp2BitWeightPosTbl ww[0x400] cbSize:0x1000 // BitPos orgin = 0,1,2,...,0x3FF orgin[0,1,2,...,0x3FF] = orgin[rand_s(clock_rand)] .1408hww clock_rand .140Chww clock_rand} |
大数的多项式表示，表示为不同基数幂与系数的乘积和
1 | BigNum = sum(xi*R^^i) // i = 0 .. n, R=16,10,ect. |
1 | BigNum = sum(xi*R^^i) // i = 0 .. n, R=16,10,ect. |
大数位权的随机化，会使得我们对BigNum修改起来比较麻烦，这时候我们可以采取规整的方式。
BigNum.08h.RandBitWeightSeq[0x100] 放的是xi值，其位权由BigNum.408h.BitExp2BitWeightPosTb[0x100]索引到该值的索引决定
要针对性修改 xi*R^^i项,需要通过 xi =
RandBitWeightSeq [BitExp2BitWeightPosTb[i]]的方式定位
要进行规整，方便我们直接修改BigNum，我们可以在BigNum基本初始化后（都是随机位权），或赋值前，
修改
RandBitWeightSeq 和 BitExp2BitWeightPosTb，主要是
BitExp2BitWeightPosTb，因为基本初始化后，或赋值前，
RandBitWeightSeq值没有意义
可以直接清了，这里以xdbg32调试器为例，如图，
在上图 4B8FDB，和 4B9001 下断，然后修改ecx指向的BigNum内存布局，.04到.404的内存我们选定，右键binary > Fill 00进行全部填充零除了，
.408开始的0x400个字节，我们先用python生成要复制的内容，然后选定
右键binary > Paste粘贴即可
之后加载的BigNum其各个位权的值都是按顺序排列，可以直接修改
1 | ''.join([struct.pack("<L",i).encode('hex') for i in range(0,0x400)]) |
最后于 2019-3-28 08:56
被HHHso编辑
，原因：
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