2023年西北工业大学“网安先锋者”大赛WriteUp☍
约 506 个字 108 行代码 预计阅读时间 12 分钟
Misc☍
TENET☍
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打开压缩包发现三张图片
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使用二进制编辑器打开前两张图片可以在结尾找到隐藏字符串：
SATOR和AREPO。
而第三章图片的隐藏信息藏在详细信息中，可以看到主题信息为
OPERA。
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根据压缩包的名称
part1-part2-part3.zip，可以得出密码为SATOR-AREPO-OPERA。打卡压缩包，得到一个图片和一个压缩包。
易知，密码为
12602123297335631。
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打开压缩包，得到一个文本文件。
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根据文件名推测为凯撒密码，通过观察发现其偏移量逐个字母减一，写出解密脚本：
flag=[82, 87, 75, 80, 99, 87, 84, 76, 21, 82, 72, 71, 83, 68, 82, 23, 64, 20, 12, 16, 8, 60, 83] # flag=[chr(x-80+ord('f')) for x in flag] key = 82 for s in flag: print(chr(s-i+ord('f')), end='') key -= 1得到
flag{png1offset:d9270e}。 -
根据假flag内容查看
png1中的第(0xd9270, 0xe)处：
注意到字符串每隔一个字符取一位拼出的字符串为
flag{there_4re_n0_fr1ends_a7_dusk}。
官方题解：Misc-TENET-200.pdf
Crypto☍
jc☍
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打开附件，得到
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])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[!+[]+!+[]]])()
-
根据题干可知可能人需要在控制台执行，再次执行得到flag。
结果为
flag{c6348be2adf745973b850af5b22163f4}
官方题解：Crypto-jc-100.pdf
Reverse☍
Packer☍
-
检查程序发现UPX，利用脚本脱壳处理。
-
将脱壳后的程序放入IDA中分析，发现程序中有一个
check_flag函数。
int __cdecl main(int argc, const char **argv, const char **envp)
{
char v4[272]; // [rsp+20h] [rbp-60h] BYREF
_main(argc, argv, envp);
printf("Input flag: ");
scanf("%s", v4);
check_flag(v4);
return 0;
}
进入函数查看反汇编代码，得到flag。
```c
__int64 __fastcall check_flag(char *a1)
{
__int64 result; // rax
if ( *a1 != 102 )
return 0i64;
result = (unsigned __int8)a1[1];
if ( (_BYTE)result == 108 )
{
result = (unsigned __int8)a1[2];
if ( (_BYTE)result == 97 )
{
result = (unsigned __int8)a1[3];
if ( (_BYTE)result == 103 )
{
result = (unsigned __int8)a1[4];
if ( (_BYTE)result == 123 )
{
result = (unsigned __int8)a1[5];
if ( (_BYTE)result == 115 )
{
result = (unsigned __int8)a1[6];
if ( (_BYTE)result == 65 )
{
result = (unsigned __int8)a1[7];
if ( (_BYTE)result == 100 )
{
result = (unsigned __int8)a1[8];
if ( (_BYTE)result == 102 )
{
result = (unsigned __int8)a1[9];
if ( (_BYTE)result == 95 )
{
result = (unsigned __int8)a1[10];
if ( (_BYTE)result == 102 )
{
result = (unsigned __int8)a1[11];
if ( (_BYTE)result == 68 )
{
result = (unsigned __int8)a1[12];
if ( (_BYTE)result == 102 )
{
result = (unsigned __int8)a1[13];
if ( (_BYTE)result == 107 )
{
result = (unsigned __int8)a1[14];
if ( (_BYTE)result == 108 )
{
result = (unsigned __int8)a1[15];
if ( (_BYTE)result == 95 )
{
result = (unsigned __int8)a1[16];
if ( (_BYTE)result == 70 )
{
result = (unsigned __int8)a1[17];
if ( (_BYTE)result == 100 )
{
result = (unsigned __int8)a1[18];
if ( (_BYTE)result == 102 )
{
result = (unsigned __int8)a1[19];
if ( (_BYTE)result == 125 )
{
printf("yes,this is a flag");
getchar();
return 0i64;
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
return result;
}
```
编写脚本得到flag。
```python
flag = [102, 108, 97, 103, 123, 115, 65, 100, 102, 95, 102, 68, 102, 107, 108, 95, 70, 100, 102, 125]
flag = ''.join([chr(i) for i in flag])
print(flag)
```
结果为`flag{sAdf_fDfkl_Fdf}`。
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