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[原创]第二题 末日邀请
发表于: 2022-5-12 11:59 10465

[原创]第二题 末日邀请

2022-5-12 11:59
10465

文件没壳,拖入IDA分析。
刚开始对字符串进行运算,这部分重要的结果是v10。

对字符串进行处理。处理方式是如果不大于0x 3A则减0x30,大于则减0x37。字符串大值应该大于0x30,即字符0以上。

前面得出的v10值会在后面进行赋初值运算,这里的v13是前面v10的结果。这部分运算会取最后的三位进行或得到结果和输入字符串处理后的前三位异或进行对比,应该一致。这部分赋初值的运算结果如果初值是正数(小于0x80,且不为0)则数组最后的结果是0x4,0x2,0x1的循环。所以后面三位的或结果定为7。即字符串前三位处理后异或结果为7。


这部分对比处理过的字符串的第4-7位,换算下来固定为KCTF。

这部分是长度计算。v17是前面的结果7,v18是字符串长度。v19结果则9。v18-v19-7的意思是减掉7(前三位校验+KCTF长度),减掉9(字符串中可能的另一校验部分),剩下的长度做其他处理对比。
寻找v19这部分这部分逆着看会和字符串1234567890_ABCDEFGHIJKLMNOPQRSTUVWXYZ顺序对比,所以这9位一定是1-9的字符。

对比之前是排序,所以这9位顺序不一定。

在排序前这就是确定数字位置的算法了,红框的是障眼法,9位数肯定小于1262703685。算法是从第一位开始取,每次和前面取的组成一个整数,直到第九位,且每次取组成的数能够整除取的次数。这个可以通过程序求出唯一解:381654729。

求解程序如下,首先是1-9的全排列,然后寻找符合条件的值:

寻找v20这部分会做异或对比,两个固定数组前几位是,从第三位开始异或结果为0x91不可能为字符串处理的结果,所以v20的长度取值只能为0,1,2。
CE D2 2C BA AB
CE D2 B1 B2 B6


到这一步的推论,正确的解应该是xxxKCTF381654729[xx],这样的形式。

最开始的字符串有类似CRC处理,得到最后结果会做最后校验,以确保字符串唯一性。校验值为0xF52E0765。

到这一步基本上条件确定了,然后用程序求解,最后得到结果421KCTF381654729。

 
public static void Permutation(int[] arr, int m, int n)
{
    if (m < n - 1)
    {
        Permutation(arr, m + 1, n);
        for (var i = m + 1; i < n; i++)
        {
            var t = arr[m];
            arr[m] = arr[i];
            arr[i] = t;
            Permutation(arr, m + 1, n);
            t = arr[m];
            arr[m] = arr[i];
            arr[i] = t;
        }
    }
    else
    {
        int intnow = 0;
        foreach (var item in arr)
        {
            intnow = intnow \* 10 + item;
        }
        int div = 10;
        int temp = intnow;
        for (int j = div; j > 1;)
        {
            j--;
            if (temp % j != 0)
            {
                break;
            }
            if (j == 1)
            {
                Console.WriteLine(intnow);
            }
            else
            {
                temp = temp / 10;
            }
        }
    }
}
public static void Permutation(int[] arr, int m, int n)
{
    if (m < n - 1)
    {
        Permutation(arr, m + 1, n);
        for (var i = m + 1; i < n; i++)
        {
            var t = arr[m];
            arr[m] = arr[i];
            arr[i] = t;
            Permutation(arr, m + 1, n);
            t = arr[m];
            arr[m] = arr[i];
            arr[i] = t;
        }
    }
    else
    {
        int intnow = 0;
        foreach (var item in arr)
        {
            intnow = intnow \* 10 + item;
        }
        int div = 10;
        int temp = intnow;
        for (int j = div; j > 1;)
        {
            j--;
            if (temp % j != 0)
            {
                break;
            }
            if (j == 1)
            {
                Console.WriteLine(intnow);
            }
            else
            {
                temp = temp / 10;
            }
        }
    }
}
 
 
        static byte[] hexData = {
    0x00, 0x00, 0x00, 0x00, 0x96, 0x30, 0x07, 0x09, 0x2C, 0x61, 0x0E, 0x12, 0xBA, 0x51, 0x09, 0x1B,
    0x19, 0xC4, 0x6D, 0xFF, 0x8F, 0xF4, 0x6A, 0xF6, 0x35, 0xA5, 0x63, 0xED, 0xA3, 0x95, 0x64, 0xE4,
    0x32, 0x88, 0xDB, 0xFE, 0xA4, 0xB8, 0xDC, 0xF7, 0x1E, 0xE9, 0xD5, 0xEC, 0x88, 0xD9, 0xD2, 0xE5,
    0x2B, 0x4C, 0xB6, 0x01, 0xBD, 0x7C, 0xB1, 0x08, 0x07, 0x2D, 0xB8, 0x13, 0x91, 0x1D, 0xBF, 0x1A,
    0x64, 0x10, 0xB7, 0xFD, 0xF2, 0x20, 0xB0, 0xF4, 0x48, 0x71, 0xB9, 0xEF, 0xDE, 0x41, 0xBE, 0xE6,
    0x7D, 0xD4, 0xDA, 0x02, 0xEB, 0xE4, 0xDD, 0x0B, 0x51, 0xB5, 0xD4, 0x10, 0xC7, 0x85, 0xD3, 0x19,
    0x56, 0x98, 0x6C, 0x03, 0xC0, 0xA8, 0x6B, 0x0A, 0x7A, 0xF9, 0x62, 0x11, 0xEC, 0xC9, 0x65, 0x18,
    0x4F, 0x5C, 0x01, 0xFC, 0xD9, 0x6C, 0x06, 0xF5, 0x63, 0x3D, 0x0F, 0xEE, 0xF5, 0x0D, 0x08, 0xE7,
    0xC8, 0x20, 0x6E, 0xFB, 0x5E, 0x10, 0x69, 0xF2, 0xE4, 0x41, 0x60, 0xE9, 0x72, 0x71, 0x67, 0xE0,
    0xD1, 0xE4, 0x03, 0x04, 0x47, 0xD4, 0x04, 0x0D, 0xFD, 0x85, 0x0D, 0x16, 0x6B, 0xB5, 0x0A, 0x1F,
    0xFA, 0xA8, 0xB5, 0x05, 0x6C, 0x98, 0xB2, 0x0C, 0xD6, 0xC9, 0xBB, 0x17, 0x40, 0xF9, 0xBC, 0x1E,
    0xE3, 0x6C, 0xD8, 0xFA, 0x75, 0x5C, 0xDF, 0xF3, 0xCF, 0x0D, 0xD6, 0xE8, 0x59, 0x3D, 0xD1, 0xE1,
    0xAC, 0x30, 0xD9, 0x06, 0x3A, 0x00, 0xDE, 0x0F, 0x80, 0x51, 0xD7, 0x14, 0x16, 0x61, 0xD0, 0x1D,
    0xB5, 0xF4, 0xB4, 0xF9, 0x23, 0xC4, 0xB3, 0xF0, 0x99, 0x95, 0xBA, 0xEB, 0x0F, 0xA5, 0xBD, 0xE2,
    0x9E, 0xB8, 0x02, 0xF8, 0x08, 0x88, 0x05, 0xF1, 0xB2, 0xD9, 0x0C, 0xEA, 0x24, 0xE9, 0x0B, 0xE3,
    0x87, 0x7C, 0x6F, 0x07, 0x11, 0x4C, 0x68, 0x0E, 0xAB, 0x1D, 0x61, 0x15, 0x3D, 0x2D, 0x66, 0x1C,
    0x90, 0x41, 0xDC, 0xF6, 0x06, 0x71, 0xDB, 0xFF, 0xBC, 0x20, 0xD2, 0xE4, 0x2A, 0x10, 0xD5, 0xED,
    0x89, 0x85, 0xB1, 0x09, 0x1F, 0xB5, 0xB6, 0x00, 0xA5, 0xE4, 0xBF, 0x1B, 0x33, 0xD4, 0xB8, 0x12,
    0xA2, 0xC9, 0x07, 0x08, 0x34, 0xF9, 0x00, 0x01, 0x8E, 0xA8, 0x09, 0x1A, 0x18, 0x98, 0x0E, 0x13,
    0xBB, 0x0D, 0x6A, 0xF7, 0x2D, 0x3D, 0x6D, 0xFE, 0x97, 0x6C, 0x64, 0xE5, 0x01, 0x5C, 0x63, 0xEC,
    0xF4, 0x51, 0x6B, 0x0B, 0x62, 0x61, 0x6C, 0x02, 0xD8, 0x30, 0x65, 0x19, 0x4E, 0x00, 0x62, 0x10,
    0xED, 0x95, 0x06, 0xF4, 0x7B, 0xA5, 0x01, 0xFD, 0xC1, 0xF4, 0x08, 0xE6, 0x57, 0xC4, 0x0F, 0xEF,
    0xC6, 0xD9, 0xB0, 0xF5, 0x50, 0xE9, 0xB7, 0xFC, 0xEA, 0xB8, 0xBE, 0xE7, 0x7C, 0x88, 0xB9, 0xEE,
    0xDF, 0x1D, 0xDD, 0x0A, 0x49, 0x2D, 0xDA, 0x03, 0xF3, 0x7C, 0xD3, 0x18, 0x65, 0x4C, 0xD4, 0x11,
    0x58, 0x61, 0xB2, 0x0D, 0xCE, 0x51, 0xB5, 0x04, 0x74, 0x00, 0xBC, 0x1F, 0xE2, 0x30, 0xBB, 0x16,
    0x41, 0xA5, 0xDF, 0xF2, 0xD7, 0x95, 0xD8, 0xFB, 0x6D, 0xC4, 0xD1, 0xE0, 0xFB, 0xF4, 0xD6, 0xE9,
    0x6A, 0xE9, 0x69, 0xF3, 0xFC, 0xD9, 0x6E, 0xFA, 0x46, 0x88, 0x67, 0xE1, 0xD0, 0xB8, 0x60, 0xE8,
    0x73, 0x2D, 0x04, 0x0C, 0xE5, 0x1D, 0x03, 0x05, 0x5F, 0x4C, 0x0A, 0x1E, 0xC9, 0x7C, 0x0D, 0x17,
    0x3C, 0x71, 0x05, 0xF0, 0xAA, 0x41, 0x02, 0xF9, 0x10, 0x10, 0x0B, 0xE2, 0x86, 0x20, 0x0C, 0xEB,
    0x25, 0xB5, 0x68, 0x0F, 0xB3, 0x85, 0x6F, 0x06, 0x09, 0xD4, 0x66, 0x1D, 0x9F, 0xE4, 0x61, 0x14,
    0x0E, 0xF9, 0xDE, 0x0E, 0x98, 0xC9, 0xD9, 0x07, 0x22, 0x98, 0xD0, 0x1C, 0xB4, 0xA8, 0xD7, 0x15,
    0x17, 0x3D, 0xB3, 0xF1, 0x81, 0x0D, 0xB4, 0xF8, 0x3B, 0x5C, 0xBD, 0xE3, 0xAD, 0x6C, 0xBA, 0xEA,
    0x20, 0x83, 0xB8, 0xED, 0xB6, 0xB3, 0xBF, 0xE4, 0x0C, 0xE2, 0xB6, 0xFF, 0x9A, 0xD2, 0xB1, 0xF6,
    0x39, 0x47, 0xD5, 0x12, 0xAF, 0x77, 0xD2, 0x1B, 0x15, 0x26, 0xDB, 0x00, 0x83, 0x16, 0xDC, 0x09,
    0x12, 0x0B, 0x63, 0x13, 0x84, 0x3B, 0x64, 0x1A, 0x3E, 0x6A, 0x6D, 0x01, 0xA8, 0x5A, 0x6A, 0x08,
    0x0B, 0xCF, 0x0E, 0xEC, 0x9D, 0xFF, 0x09, 0xE5, 0x27, 0xAE, 0x00, 0xFE, 0xB1, 0x9E, 0x07, 0xF7,
    0x44, 0x93, 0x0F, 0x10, 0xD2, 0xA3, 0x08, 0x19, 0x68, 0xF2, 0x01, 0x02, 0xFE, 0xC2, 0x06, 0x0B,
    0x5D, 0x57, 0x62, 0xEF, 0xCB, 0x67, 0x65, 0xE6, 0x71, 0x36, 0x6C, 0xFD, 0xE7, 0x06, 0x6B, 0xF4,
    0x76, 0x1B, 0xD4, 0xEE, 0xE0, 0x2B, 0xD3, 0xE7, 0x5A, 0x7A, 0xDA, 0xFC, 0xCC, 0x4A, 0xDD, 0xF5,
    0x6F, 0xDF, 0xB9, 0x11, 0xF9, 0xEF, 0xBE, 0x18, 0x43, 0xBE, 0xB7, 0x03, 0xD5, 0x8E, 0xB0, 0x0A,
    0xE8, 0xA3, 0xD6, 0x16, 0x7E, 0x93, 0xD1, 0x1F, 0xC4, 0xC2, 0xD8, 0x04, 0x52, 0xF2, 0xDF, 0x0D,
    0xF1, 0x67, 0xBB, 0xE9, 0x67, 0x57, 0xBC, 0xE0, 0xDD, 0x06, 0xB5, 0xFB, 0x4B, 0x36, 0xB2, 0xF2,
    0xDA, 0x2B, 0x0D, 0xE8, 0x4C, 0x1B, 0x0A, 0xE1, 0xF6, 0x4A, 0x03, 0xFA, 0x60, 0x7A, 0x04, 0xF3,
    0xC3, 0xEF, 0x60, 0x17, 0x55, 0xDF, 0x67, 0x1E, 0xEF, 0x8E, 0x6E, 0x05, 0x79, 0xBE, 0x69, 0x0C,
    0x8C, 0xB3, 0x61, 0xEB, 0x1A, 0x83, 0x66, 0xE2, 0xA0, 0xD2, 0x6F, 0xF9, 0x36, 0xE2, 0x68, 0xF0,
    0x95, 0x77, 0x0C, 0x14, 0x03, 0x47, 0x0B, 0x1D, 0xB9, 0x16, 0x02, 0x06, 0x2F, 0x26, 0x05, 0x0F,
    0xBE, 0x3B, 0xBA, 0x15, 0x28, 0x0B, 0xBD, 0x1C, 0x92, 0x5A, 0xB4, 0x07, 0x04, 0x6A, 0xB3, 0x0E,
    0xA7, 0xFF, 0xD7, 0xEA, 0x31, 0xCF, 0xD0, 0xE3, 0x8B, 0x9E, 0xD9, 0xF8, 0x1D, 0xAE, 0xDE, 0xF1,
    0xB0, 0xC2, 0x64, 0x1B, 0x26, 0xF2, 0x63, 0x12, 0x9C, 0xA3, 0x6A, 0x09, 0x0A, 0x93, 0x6D, 0x00,
    0xA9, 0x06, 0x09, 0xE4, 0x3F, 0x36, 0x0E, 0xED, 0x85, 0x67, 0x07, 0xF6, 0x13, 0x57, 0x00, 0xFF,
    0x82, 0x4A, 0xBF, 0xE5, 0x14, 0x7A, 0xB8, 0xEC, 0xAE, 0x2B, 0xB1, 0xF7, 0x38, 0x1B, 0xB6, 0xFE,
    0x9B, 0x8E, 0xD2, 0x1A, 0x0D, 0xBE, 0xD5, 0x13, 0xB7, 0xEF, 0xDC, 0x08, 0x21, 0xDF, 0xDB, 0x01,
    0xD4, 0xD2, 0xD3, 0xE6, 0x42, 0xE2, 0xD4, 0xEF, 0xF8, 0xB3, 0xDD, 0xF4, 0x6E, 0x83, 0xDA, 0xFD,
    0xCD, 0x16, 0xBE, 0x19, 0x5B, 0x26, 0xB9, 0x10, 0xE1, 0x77, 0xB0, 0x0B, 0x77, 0x47, 0xB7, 0x02,
    0xE6, 0x5A, 0x08, 0x18, 0x70, 0x6A, 0x0F, 0x11, 0xCA, 0x3B, 0x06, 0x0A, 0x5C, 0x0B, 0x01, 0x03,
    0xFF, 0x9E, 0x65, 0xE7, 0x69, 0xAE, 0x62, 0xEE, 0xD3, 0xFF, 0x6B, 0xF5, 0x45, 0xCF, 0x6C, 0xFC,
    0x78, 0xE2, 0x0A, 0xE0, 0xEE, 0xD2, 0x0D, 0xE9, 0x54, 0x83, 0x04, 0xF2, 0xC2, 0xB3, 0x03, 0xFB,
    0x61, 0x26, 0x67, 0x1F, 0xF7, 0x16, 0x60, 0x16, 0x4D, 0x47, 0x69, 0x0D, 0xDB, 0x77, 0x6E, 0x04,
    0x4A, 0x6A, 0xD1, 0x1E, 0xDC, 0x5A, 0xD6, 0x17, 0x66, 0x0B, 0xDF, 0x0C, 0xF0, 0x3B, 0xD8, 0x05,
    0x53, 0xAE, 0xBC, 0xE1, 0xC5, 0x9E, 0xBB, 0xE8, 0x7F, 0xCF, 0xB2, 0xF3, 0xE9, 0xFF, 0xB5, 0xFA,
    0x1C, 0xF2, 0xBD, 0x1D, 0x8A, 0xC2, 0xBA, 0x14, 0x30, 0x93, 0xB3, 0x0F, 0xA6, 0xA3, 0xB4, 0x06,
    0x05, 0x36, 0xD0, 0xE2, 0x93, 0x06, 0xD7, 0xEB, 0x29, 0x57, 0xDE, 0xF0, 0xBF, 0x67, 0xD9, 0xF9,
    0x2E, 0x7A, 0x66, 0xE3, 0xB8, 0x4A, 0x61, 0xEA, 0x02, 0x1B, 0x68, 0xF1, 0x94, 0x2B, 0x6F, 0xF8,
    0x37, 0xBE, 0x0B, 0x1C, 0xA1, 0x8E, 0x0C, 0x15, 0x1B, 0xDF, 0x05, 0x0E, 0x8D, 0xEF, 0x02, 0x07
};
        static UInt32[] crcTable = new UInt32[256];
        public static uint GetCRC32(byte[] bytes)
        {
 
            uint iCount = (uint)bytes.Length;
            uint crc = 0xFFFFFFFF;
 
            for (uint i = 0; i < iCount; i++)
            {
                bool flag = (crc & 0x80000000) > 0;
                crc =  crcTable[(byte)((crc) ^ bytes[i])] ^ (crc >> 8  | (flag ? (0xFF000000): (0x00000000))) ;
            }
 
            return \~crc;
        }
 
 
        static void Main(string[] args)
        {
            for (int i = 0; i < 256; i++)
            {
                crcTable[i] = BitConverter.ToUInt32(hexData, i \* 4);
            }
            string psb1 = "KCTF38165472900";
            string psb2 = "KCTF3816547290";
            string psb3 = "KCTF381654729";
            byte[] psb1b = Encoding.Default.GetBytes(psb1);
            byte[] psb2b = Encoding.Default.GetBytes(psb2);
            byte[] psb3b = Encoding.Default.GetBytes(psb3);
            for (int i = 48; i < 127; i++)
            {
                for (int j = 48; j < 127; j++)
                {
                    for (int k = 48; k < 127; k++)
                    {
                        int ii = i, jj = j,kk=k;
                        ii = ii >= 58 ? (ii - 55) : (ii - 48);
                        jj = jj >= 58 ? (jj - 55) : (jj - 48);
                        kk = kk >= 58 ? (kk - 55) : (kk - 48);
 
                        if ((ii ^ jj ^ kk) == 7)
                        {
 
                            byte[] prefix = new byte[] {(byte)i, (byte)j, (byte)k };
                            byte[] test1 = new byte[psb1b.Length + prefix.Length];
                            byte[] test2 = new byte[psb2b.Length + prefix.Length];
                            byte[] test3= new byte[psb3b.Length + prefix.Length];
                            Array.Copy(prefix, 0, test1, 0, 3);
                            Array.Copy(psb1b, 0, test1, 3, psb1b.Length);
                            Array.Copy(prefix, 0, test2, 0, 3);
                            Array.Copy(psb2b, 0, test2, 3, psb2b.Length);
                            Array.Copy(prefix, 0, test3, 0, 3);
                            Array.Copy(psb3b, 0, test3, 3, psb3b.Length);
                            uint crc = GetCRC32(test1);
                            if (crc == 0xF52E0765)
                            {
                                Console.WriteLine(Encoding.Default.GetString(test1));
                            }
                            crc = GetCRC32(test2);
                            if (crc == 0xF52E0765)
                            {
                                Console.WriteLine(Encoding.Default.GetString(test2));
                            }
                            crc = GetCRC32(test3);
                            if (crc == 0xF52E0765)
                            {
                                Console.WriteLine(Encoding.Default.GetString(test3));
                            }
                        }
                    }
                }
            }
        }
        static byte[] hexData = {
    0x00, 0x00, 0x00, 0x00, 0x96, 0x30, 0x07, 0x09, 0x2C, 0x61, 0x0E, 0x12, 0xBA, 0x51, 0x09, 0x1B,
    0x19, 0xC4, 0x6D, 0xFF, 0x8F, 0xF4, 0x6A, 0xF6, 0x35, 0xA5, 0x63, 0xED, 0xA3, 0x95, 0x64, 0xE4,
    0x32, 0x88, 0xDB, 0xFE, 0xA4, 0xB8, 0xDC, 0xF7, 0x1E, 0xE9, 0xD5, 0xEC, 0x88, 0xD9, 0xD2, 0xE5,
    0x2B, 0x4C, 0xB6, 0x01, 0xBD, 0x7C, 0xB1, 0x08, 0x07, 0x2D, 0xB8, 0x13, 0x91, 0x1D, 0xBF, 0x1A,
    0x64, 0x10, 0xB7, 0xFD, 0xF2, 0x20, 0xB0, 0xF4, 0x48, 0x71, 0xB9, 0xEF, 0xDE, 0x41, 0xBE, 0xE6,
    0x7D, 0xD4, 0xDA, 0x02, 0xEB, 0xE4, 0xDD, 0x0B, 0x51, 0xB5, 0xD4, 0x10, 0xC7, 0x85, 0xD3, 0x19,
    0x56, 0x98, 0x6C, 0x03, 0xC0, 0xA8, 0x6B, 0x0A, 0x7A, 0xF9, 0x62, 0x11, 0xEC, 0xC9, 0x65, 0x18,
    0x4F, 0x5C, 0x01, 0xFC, 0xD9, 0x6C, 0x06, 0xF5, 0x63, 0x3D, 0x0F, 0xEE, 0xF5, 0x0D, 0x08, 0xE7,
    0xC8, 0x20, 0x6E, 0xFB, 0x5E, 0x10, 0x69, 0xF2, 0xE4, 0x41, 0x60, 0xE9, 0x72, 0x71, 0x67, 0xE0,
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[培训]内核驱动高级班,冲击BAT一流互联网大厂工作,每周日13:00-18:00直播授课

最后于 2022-5-12 12:05 被xwwei编辑 ,原因:
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