xD MAZE

简单的一维数组

1

输入的0，1，2，3代表移动的位数

2

1
2
3
4
5
6
7
8
9
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0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x20,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x20]
for i in range(64):
    tmp=""
    for j in range(64):
        if map[i*64+j]==32:
            tmp+="1,"
        else:
            tmp+="0,"
    print(tmp)

可以直接输出

1
#hgame{3120113031203203222231003011}

upx magic 0

看名字是有upx壳的，结果没有，因为附件放错了，直接看

通过字符串定位到主函数

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 v14 = __readfsqword(0x28u);
  v12[0] = 0LL;
  v12[1] = 0LL;
  v12[2] = 0LL;
  v12[3] = 0LL;
  v12[4] = 0LL;
  v12[5] = 0LL;
  v13 = 0;
  scanf((unsigned int)"%40s", (unsigned int)v12, a3, a4, a5, a6);
  if ( len_0((__int64)v12) != (unsigned __int64 (__fastcall *)(unsigned __int64, __m128))32 )
  {
    printf((__int64)"length error");
    sub_40ED20(0LL);
  }
  for ( i = 0; i < (unsigned __int64)len_0((__int64)v12); ++i )
  {
    v8 = *((char *)v12 + i) << 8;
    for ( j = 0; j <= 7; ++j )
    {
      if ( (v8 & 0x8000) != 0 )
        v8 = (2 * v8) ^ 0x1021;
      else
        v8 *= 2;
    }
    v11[i] = (unsigned __int16)v8;
  }
  v10[0] = 36200;
  v10[1] = 40265;
  v10[2] = 10770;
  v10[3] = 43802;
  v10[4] = 52188;
  v10[5] = 47403;
  v10[6] = 11826;
  v10[7] = 40793;
  v10[8] = 56781;
  v10[9] = 40265;
  v10[10] = 43274;
  v10[11] = 3696;
  v10[12] = 62927;
  v10[13] = 2640;
  v10[14] = 23285;
  v10[15] = 65439;
  v10[16] = 40793;
  v10[17] = 48395;
  v10[18] = 22757;
  v10[19] = 14371;
  v10[20] = 48923;
  v10[21] = 30887;
  v10[22] = 43802;
  v10[23] = 18628;
  v10[24] = 43274;
  v10[25] = 11298;
  v10[26] = 40793;
  v10[27] = 23749;
  v10[28] = 24277;
  v10[29] = 30887;
  v10[30] = 9842;
  v10[31] = 22165;
  if ( (unsigned int)sub_400490(v11, v10, 32LL) )// 判断相等
    sub_4107A0("Wrong");
  else
    sub_4107A0("Great,your input is flag");
  result = 0LL;
  if ( __readfsqword(0x28u) != v14 )
    sub_44B8A0();
  return result;
}

输入中的每个字符先左移8位，然后经过一个CRC16变换，结果与数组v10比较

crc16加密，直接可以算法爆破

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import string

def calcc(data):
	data = ord(data)
	data = data<<8
	for j in range(8):
	  if  (data & 0x8000) != 0 :
	    data = (2 * data) ^ 0x1021;
	  else:
	    data *= 2;
	data = data &0xffff
	return data

r=[36200, 40265, 10770, 43802, 52188, 47403, 11826, 40793, 56781, 40265, 43274, 3696, 62927, 2640, 23285, 65439, 40793, 48395, 22757, 14371, 48923, 30887, 43802, 18628, 43274, 11298, 40793, 23749, 24277, 30887, 9842, 22165]

flag=""
for i in r:
	for t in  string.printable:   #可输出字符
		if calcc(t) == i:
			flag+=t
			break
print(flag)
#noW_YOu~koNw-UPx~mAG|C_@Nd~crC16

fake shell

3

需要输入sudo才能进入下一个函数

4

sub_176C就是验证函数

5

很明显的RC4,sub_1358初始化，下面加密再比较，这里有一个坑，key其实在前面被改过了，是一个

__attribute((constructor)) 的函数，可以在main函数前运行

直接用密钥”happyhg4me!“解密发现不对，对aHappyhg4me查找交叉引用发现密钥被修改为”w0wy0ugot1t”

6

直接解密即可

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#include<stdio.h>
void rc4_init(unsigned char* s, unsigned char* key, unsigned long Len_k)
{
	int i = 0, j = 0;
	char k[256] = { 0 };
	unsigned char tmp = 0;
	for (i = 0; i < 256; i++) {
		s[i] = i;
		k[i] = key[i % Len_k];
	}
	for (i = 0; i < 256; i++) {
		j = (j + s[i] + k[i]) % 256;
		tmp = s[i];
		s[i] = s[j];
		s[j] = tmp;
	}
}

void rc4_crypt(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k) //加解密
{
	unsigned char s[256];
	rc4_init(s, key, Len_k);
	int i = 0, j = 0, t = 0;
	unsigned long k = 0;
	unsigned char tmp;
	for (k = 0; k < Len_D; k++) {
		i = (i + 1) % 256;
		j = (j + s[i]) % 256;
		tmp = s[i];
		s[i] = s[j];
		s[j] = tmp;
		t = (s[i] + s[j]) % 256;
		Data[k] = Data[k] ^ s[t];
	}
}
void main()
{
	//密钥
	unsigned char key[] = "w0wy0ugot1t";
	unsigned long key_len = sizeof(key) - 1;
	//密文
	unsigned char data[] = {182, 148, 250, 143, 61, 95, 178, 224, 234, 15, 210, 102, 152, 108, 157, 231, 27, 8, 64, 113, 197, 190, 111, 109, 124, 123, 9, 141, 168, 189, 243, 246};
	//解密
	rc4_crypt(data, sizeof(data), key, key_len);
	for (int i = 0; i < sizeof(data); i++)
	{
		printf("%c", data[i]);
	}
	printf("\n");
	return;
}

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hgame{s0meth1ng_run_bef0r_m4in?}

upx magic 1

这题有壳，算法和0一样

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v14 = [0 for i in range(37)]
v14[0] = 36200;
v14[1] = 40265;
v14[2] = 10770;
v14[3] = 43802;
v14[4] = 52188;
v14[5] = 47403;
v14[6] = 11826;
v14[7] = 40793;
v14[8] = 56781;
v14[9] = 40265;
v14[10] = 43274;
v14[11] = 3696;
v14[12] = 62927;
v14[13] = 24277;
v14[14] = 15363;
v14[15] = 31879;
v14[16] = 9842;
v14[17] = 43802;
v14[18] = 2640;
v14[19] = 23285;
v14[20] = 65439;
v14[21] = 40793;
v14[22] = 48395;
v14[23] = 22757;
v14[24] = 14371;
v14[25] = 48923;
v14[26] = 30887;
v14[27] = 43802;
v14[28] = 18628;
v14[29] = 43274;
v14[30] = 11298;
v14[31] = 40793;
v14[32] = 23749;
v14[33] = 24277;
v14[34] = 30887;
v14[35] = 9842;
v14[36] = 22165;

def checkval(data):
  v12 = ord(data) << 8
  for j in range(8):
    if (v12 & 0x8000) != 0:
      v12 = (2 * v12)^ 0x1021
    else:
      v12 = 2 * v12
  print(data,hex(v12&0xffff))
  return v12&0xffff

import string

def checkval1(dest):
  for i in string.printable:
    if checkval(i) == dest:
      return i
  return 0

flag=''
for i in range(37):
  flag+=checkval1(v14[i])
print(flag)

#noW_YOu~koNw-rea1_UPx~mAG|C_@Nd~crC16