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KCTF2021[秋季赛][第七题][声名远扬]wp
发表于: 2021-12-2 08:22 16012

KCTF2021[秋季赛][第七题][声名远扬]wp

ccfer 活跃值
16
2021-12-2 08:22
16012

ollydbg打开CrackMe.exe
翻看几分钟，尝试一些断点之后，找到处理输入的地方：

跟进去可以找到base64初始化码表的地方：

得到base64码表：prvo9CHSJOcPIb6xRVUXQz0qBGDE72LNZduaefYT5K_8-4FAhlimjkngt1yMWs3w!

往下慢慢走，调试到这里看到疑似验证点：

od里不方便调试wow64了，索性在后面一行下个断点观察一下吧
在0088D8A5断下来以后，上下翻看一下堆栈，有所发现：

看到个字符串：GYldGg-iIoJlPX9hPXpjPqfdEY21B01TBTzeGqfKNR!!
尝试用前面的base64码表做一次base64解密得到：
flag{2021-10-04-yangyangbudeyi}
哈哈，这就是传说中的软柿子。

0088D381   8D95 6CFFFFFF    LEA EDX,DWORD PTR SS:[EBP-94]            //input
0088D387   52               PUSH EDX                                
0088D388   8D85 44FFFFFF    LEA EAX,DWORD PTR SS:[EBP-BC]            //output
0088D38E   50               PUSH EAX                                
0088D38F   E8 9C110000      CALL CrackMe.0088E530                    //base64，非标准码表
0088D381   8D95 6CFFFFFF    LEA EDX,DWORD PTR SS:[EBP-94]            //input
0088D387   52               PUSH EDX                                
0088D388   8D85 44FFFFFF    LEA EAX,DWORD PTR SS:[EBP-BC]            //output
0088D38E   50               PUSH EAX                                
0088D38F   E8 9C110000      CALL CrackMe.0088E530                    //base64，非标准码表
0088E250   55               PUSH EBP                                
0088E251   8BEC             MOV EBP,ESP                             
0088E253   6A FF            PUSH -1                                 
0088E255   68 1D8B8F00      PUSH CrackMe.008F8B1D                   
0088E25A   64:A1 00000000   MOV EAX,DWORD PTR FS:[0]                
0088E260   50               PUSH EAX                                
0088E261   83EC 5C          SUB ESP,5C                              
0088E264   A1 B0F08F00      MOV EAX,DWORD PTR DS:[8FF0B0]           
0088E269   33C5             XOR EAX,EBP                             
0088E26B   8945 F0          MOV DWORD PTR SS:[EBP-10],EAX           
0088E26E   50               PUSH EAX                                
0088E26F   8D45 F4          LEA EAX,DWORD PTR SS:[EBP-C]            
0088E272   64:A3 00000000   MOV DWORD PTR FS:[0],EAX                
0088E278   C745 A0 00000000 MOV DWORD PTR SS:[EBP-60],0             
0088E27F   6A 08            PUSH 8                                  
0088E281   8D4D E8          LEA ECX,DWORD PTR SS:[EBP-18]           
0088E284   E8 47F3FFFF      CALL CrackMe.0088D5D0                   
0088E289   C645 A4 70       MOV BYTE PTR SS:[EBP-5C],70               //自定义的base64码表
0088E28D   C645 A5 72       MOV BYTE PTR SS:[EBP-5B],72             
0088E291   C645 A6 76       MOV BYTE PTR SS:[EBP-5A],76             
0088E295   C645 A7 6F       MOV BYTE PTR SS:[EBP-59],6F             
0088E299   C645 A8 39       MOV BYTE PTR SS:[EBP-58],39             
0088E29D   C645 A9 43       MOV BYTE PTR SS:[EBP-57],43             
0088E2A1   C645 AA 48       MOV BYTE PTR SS:[EBP-56],48             
0088E2A5   C645 AB 53       MOV BYTE PTR SS:[EBP-55],53             
0088E2A9   C645 AC 4A       MOV BYTE PTR SS:[EBP-54],4A             
0088E2AD   C645 AD 4F       MOV BYTE PTR SS:[EBP-53],4F             
0088E2B1   C645 AE 63       MOV BYTE PTR SS:[EBP-52],63             
0088E2B5   C645 AF 50       MOV BYTE PTR SS:[EBP-51],50             
0088E2B9   C645 B0 49       MOV BYTE PTR SS:[EBP-50],49             
0088E2BD   C645 B1 62       MOV BYTE PTR SS:[EBP-4F],62             
0088E2C1   C645 B2 36       MOV BYTE PTR SS:[EBP-4E],36             
0088E2C5   C645 B3 78       MOV BYTE PTR SS:[EBP-4D],78             
0088E2C9   C645 B4 52       MOV BYTE PTR SS:[EBP-4C],52             
0088E2CD   C645 B5 56       MOV BYTE PTR SS:[EBP-4B],56             
0088E2D1   C645 B6 55       MOV BYTE PTR SS:[EBP-4A],55             
0088E2D5   C645 B7 58       MOV BYTE PTR SS:[EBP-49],58             
0088E2D9   C645 B8 51       MOV BYTE PTR SS:[EBP-48],51             
0088E2DD   C645 B9 7A       MOV BYTE PTR SS:[EBP-47],7A             
0088E2E1   C645 BA 30       MOV BYTE PTR SS:[EBP-46],30             
0088E2E5   C645 BB 71       MOV BYTE PTR SS:[EBP-45],71             
0088E2E9   C645 BC 42       MOV BYTE PTR SS:[EBP-44],42             
0088E2ED   C645 BD 47       MOV BYTE PTR SS:[EBP-43],47             
0088E2F1   C645 BE 44       MOV BYTE PTR SS:[EBP-42],44             
0088E2F5   C645 BF 45       MOV BYTE PTR SS:[EBP-41],45             
0088E2F9   C645 C0 37       MOV BYTE PTR SS:[EBP-40],37             
0088E2FD   C645 C1 32       MOV BYTE PTR SS:[EBP-3F],32             
0088E301   C645 C2 4C       MOV BYTE PTR SS:[EBP-3E],4C             
0088E305   C645 C3 4E       MOV BYTE PTR SS:[EBP-3D],4E             
0088E309   C645 C4 5A       MOV BYTE PTR SS:[EBP-3C],5A             
0088E30D   C645 C5 64       MOV BYTE PTR SS:[EBP-3B],64             
0088E311   C645 C6 75       MOV BYTE PTR SS:[EBP-3A],75             
0088E315   C645 C7 61       MOV BYTE PTR SS:[EBP-39],61             
0088E319   C645 C8 65       MOV BYTE PTR SS:[EBP-38],65             
0088E31D   C645 C9 66       MOV BYTE PTR SS:[EBP-37],66             
0088E321   C645 CA 59       MOV BYTE PTR SS:[EBP-36],59             
0088E325   C645 CB 54       MOV BYTE PTR SS:[EBP-35],54             
0088E329   C645 CC 35       MOV BYTE PTR SS:[EBP-34],35             
0088E32D   C645 CD 4B       MOV BYTE PTR SS:[EBP-33],4B             
0088E331   C645 CE 5F       MOV BYTE PTR SS:[EBP-32],5F             
0088E335   C645 CF 38       MOV BYTE PTR SS:[EBP-31],38             
0088E339   C645 D0 2D       MOV BYTE PTR SS:[EBP-30],2D             
0088E33D   C645 D1 34       MOV BYTE PTR SS:[EBP-2F],34             
0088E341   C645 D2 46       MOV BYTE PTR SS:[EBP-2E],46             
0088E345   C645 D3 41       MOV BYTE PTR SS:[EBP-2D],41             
0088E349   C645 D4 68       MOV BYTE PTR SS:[EBP-2C],68             
0088E34D   C645 D5 6C       MOV BYTE PTR SS:[EBP-2B],6C             
0088E351   C645 D6 69       MOV BYTE PTR SS:[EBP-2A],69             
0088E355   C645 D7 6D       MOV BYTE PTR SS:[EBP-29],6D             
0088E359   C645 D8 6A       MOV BYTE PTR SS:[EBP-28],6A             
0088E35D   C645 D9 6B       MOV BYTE PTR SS:[EBP-27],6B             
0088E361   C645 DA 6E       MOV BYTE PTR SS:[EBP-26],6E             
0088E365   C645 DB 67       MOV BYTE PTR SS:[EBP-25],67             
0088E369   C645 DC 74       MOV BYTE PTR SS:[EBP-24],74             
0088E36D   C645 DD 31       MOV BYTE PTR SS:[EBP-23],31             
0088E371   C645 DE 79       MOV BYTE PTR SS:[EBP-22],79             
0088E375   C645 DF 4D       MOV BYTE PTR SS:[EBP-21],4D             
0088E379   C645 E0 57       MOV BYTE PTR SS:[EBP-20],57             
0088E37D   C645 E1 73       MOV BYTE PTR SS:[EBP-1F],73             
0088E381   C645 E2 33       MOV BYTE PTR SS:[EBP-1E],33             
0088E385   C645 E3 77       MOV BYTE PTR SS:[EBP-1D],77             
0088E389   C645 E4 21       MOV BYTE PTR SS:[EBP-1C],21
0088E250   55               PUSH EBP                                
0088E251   8BEC             MOV EBP,ESP                             
0088E253   6A FF            PUSH -1                                 
0088E255   68 1D8B8F00      PUSH CrackMe.008F8B1D                   
0088E25A   64:A1 00000000   MOV EAX,DWORD PTR FS:[0]                
0088E260   50               PUSH EAX                                
0088E261   83EC 5C          SUB ESP,5C                              
0088E264   A1 B0F08F00      MOV EAX,DWORD PTR DS:[8FF0B0]           
0088E269   33C5             XOR EAX,EBP                             
0088E26B   8945 F0          MOV DWORD PTR SS:[EBP-10],EAX           
0088E26E   50               PUSH EAX                                
0088E26F   8D45 F4          LEA EAX,DWORD PTR SS:[EBP-C]            
0088E272   64:A3 00000000   MOV DWORD PTR FS:[0],EAX                
0088E278   C745 A0 00000000 MOV DWORD PTR SS:[EBP-60],0             
0088E27F   6A 08            PUSH 8                                  
0088E281   8D4D E8          LEA ECX,DWORD PTR SS:[EBP-18]           
0088E284   E8 47F3FFFF      CALL CrackMe.0088D5D0                   
0088E289   C645 A4 70       MOV BYTE PTR SS:[EBP-5C],70               //自定义的base64码表
0088E28D   C645 A5 72       MOV BYTE PTR SS:[EBP-5B],72             
0088E291   C645 A6 76       MOV BYTE PTR SS:[EBP-5A],76             
0088E295   C645 A7 6F       MOV BYTE PTR SS:[EBP-59],6F             
0088E299   C645 A8 39       MOV BYTE PTR SS:[EBP-58],39             
0088E29D   C645 A9 43       MOV BYTE PTR SS:[EBP-57],43             
0088E2A1   C645 AA 48       MOV BYTE PTR SS:[EBP-56],48             
0088E2A5   C645 AB 53       MOV BYTE PTR SS:[EBP-55],53             
0088E2A9   C645 AC 4A       MOV BYTE PTR SS:[EBP-54],4A             
0088E2AD   C645 AD 4F       MOV BYTE PTR SS:[EBP-53],4F             
0088E2B1   C645 AE 63       MOV BYTE PTR SS:[EBP-52],63             
0088E2B5   C645 AF 50       MOV BYTE PTR SS:[EBP-51],50             
0088E2B9   C645 B0 49       MOV BYTE PTR SS:[EBP-50],49             
0088E2BD   C645 B1 62       MOV BYTE PTR SS:[EBP-4F],62             
0088E2C1   C645 B2 36       MOV BYTE PTR SS:[EBP-4E],36             
0088E2C5   C645 B3 78       MOV BYTE PTR SS:[EBP-4D],78             
0088E2C9   C645 B4 52       MOV BYTE PTR SS:[EBP-4C],52             
0088E2CD   C645 B5 56       MOV BYTE PTR SS:[EBP-4B],56             
0088E2D1   C645 B6 55       MOV BYTE PTR SS:[EBP-4A],55             
0088E2D5   C645 B7 58       MOV BYTE PTR SS:[EBP-49],58             
0088E2D9   C645 B8 51       MOV BYTE PTR SS:[EBP-48],51             
0088E2DD   C645 B9 7A       MOV BYTE PTR SS:[EBP-47],7A             
0088E2E1   C645 BA 30       MOV BYTE PTR SS:[EBP-46],30             
0088E2E5   C645 BB 71       MOV BYTE PTR SS:[EBP-45],71             
0088E2E9   C645 BC 42       MOV BYTE PTR SS:[EBP-44],42             
0088E2ED   C645 BD 47       MOV BYTE PTR SS:[EBP-43],47             
0088E2F1   C645 BE 44       MOV BYTE PTR SS:[EBP-42],44             
0088E2F5   C645 BF 45       MOV BYTE PTR SS:[EBP-41],45             
0088E2F9   C645 C0 37       MOV BYTE PTR SS:[EBP-40],37             
0088E2FD   C645 C1 32       MOV BYTE PTR SS:[EBP-3F],32             
0088E301   C645 C2 4C       MOV BYTE PTR SS:[EBP-3E],4C             
0088E305   C645 C3 4E       MOV BYTE PTR SS:[EBP-3D],4E             
0088E309   C645 C4 5A       MOV BYTE PTR SS:[EBP-3C],5A             
0088E30D   C645 C5 64       MOV BYTE PTR SS:[EBP-3B],64             
0088E311   C645 C6 75       MOV BYTE PTR SS:[EBP-3A],75             
0088E315   C645 C7 61       MOV BYTE PTR SS:[EBP-39],61             
0088E319   C645 C8 65       MOV BYTE PTR SS:[EBP-38],65             
0088E31D   C645 C9 66       MOV BYTE PTR SS:[EBP-37],66             
0088E321   C645 CA 59       MOV BYTE PTR SS:[EBP-36],59             
0088E325   C645 CB 54       MOV BYTE PTR SS:[EBP-35],54             
0088E329   C645 CC 35       MOV BYTE PTR SS:[EBP-34],35             
0088E32D   C645 CD 4B       MOV BYTE PTR SS:[EBP-33],4B             
0088E331   C645 CE 5F       MOV BYTE PTR SS:[EBP-32],5F             

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海风月影
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2 楼
翻看幾分鐘，太强大了
還能在堆棧還找到明文，學習了
2021-12-3 19:02
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kanxue
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3 楼
战略上：要选硬柿子捏
战术上：要挑软柿子捏


2021-12-3 19:51
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QiuJYu
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太强了
2021-12-5 23:48
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