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Go implementation of https://github.com/monoxgas/sRDI/
package main
/*
*
* This is just a Go implementation of https://github.com/monoxgas/sRDI/
* Useful if you're trying to generate shellcode for reflective DLL
* injection in Go, otherwise probably not much use :)
*
* The project, shellcode, most comments within this project
* are all from the original project by @SilentBreakSec's Nick Landers (@monoxgas)
*
* For more information about sRDI, see the blog here:
* https://silentbreaksecurity.com/srdi-shellcode-reflective-dll-injection/
*
* Warning: Not much error handling
*
*/
import (
"encoding/binary"
"flag"
"fmt"
"io/ioutil"
"math"
"os"
"strings"
)
func main() {
// handle command line arguments, -h or -help shows the menu
dll := flag.String("dll", "", "Path to DLL to convert to shellcode")
functionName := flag.String("function-name", "SayHello", "Name of function to call after DllMain.")
userDataStr := flag.String("user-data", "", "Optional data to send to the injected DLL.")
clearHeader := flag.Bool("clear-header", false, "Clear the PE header")
flag.Parse()
dllBytes, err := readFile(*dll)
if err != nil {
panic(err)
}
// functionHash is 0x10 by default, otherwise get the hash and convert to bytes
var hashFunction []byte
if *functionName != "" {
hashFunctionUint32 := hashFunctionName(*functionName)
hashFunction = pack(hashFunctionUint32)
} else {
hashFunction = pack(uint32(0x10))
}
flags := 0
if *clearHeader {
flags |= 0x1
}
var userData []byte
if *userDataStr != "" {
userData = []byte(*userDataStr)
}
shellcode := convertToShellcode(dllBytes, hashFunction, userData, flags)
outfile := strings.Replace(*dll, ".dll", ".bin", 1)
writeFile(outfile, shellcode)
fmt.Printf("Wrote shellcode to %s\n", outfile)
}
func convertToShellcode(dllBytes, functionHash, userData []byte, flags int) []byte {
rdiShellcode32 := []byte{0x83, 0xEC, 0x48, 0x83, 0x64, 0x24, 0x18, 0x00, 0xB9, 0x4C, 0x77, 0x26, 0x07, 0x53, 0x55, 0x56, 0x57, 0x33, 0xF6, 0xE8, 0x22, 0x04, 0x00, 0x00, 0xB9, 0x49, 0xF7, 0x02, 0x78, 0x89, 0x44, 0x24, 0x1C, 0xE8, 0x14, 0x04, 0x00, 0x00, 0xB9, 0x58, 0xA4, 0x53, 0xE5, 0x89, 0x44, 0x24, 0x20, 0xE8, 0x06, 0x04, 0x00, 0x00, 0xB9, 0x10, 0xE1, 0x8A, 0xC3, 0x8B, 0xE8, 0xE8, 0xFA, 0x03, 0x00, 0x00, 0xB9, 0xAF, 0xB1, 0x5C, 0x94, 0x89, 0x44, 0x24, 0x2C, 0xE8, 0xEC, 0x03, 0x00, 0x00, 0xB9, 0x33, 0x00, 0x9E, 0x95, 0x89, 0x44, 0x24, 0x30, 0xE8, 0xDE, 0x03, 0x00, 0x00, 0x8B, 0xD8, 0x8B, 0x44, 0x24, 0x5C, 0x8B, 0x78, 0x3C, 0x03, 0xF8, 0x89, 0x7C, 0x24, 0x10, 0x81, 0x3F, 0x50, 0x45, 0x00, 0x00, 0x74, 0x07, 0x33, 0xC0, 0xE9, 0xB8, 0x03, 0x00, 0x00, 0xB8, 0x4C, 0x01, 0x00, 0x00, 0x66, 0x39, 0x47, 0x04, 0x75, 0xEE, 0xF6, 0x47, 0x38, 0x01, 0x75, 0xE8, 0x0F, 0xB7, 0x57, 0x06, 0x0F, 0xB7, 0x47, 0x14, 0x85, 0xD2, 0x74, 0x22, 0x8D, 0x4F, 0x24, 0x03, 0xC8, 0x83, 0x79, 0x04, 0x00, 0x8B, 0x01, 0x75, 0x05, 0x03, 0x47, 0x38, 0xEB, 0x03, 0x03, 0x41, 0x04, 0x3B, 0xC6, 0x0F, 0x47, 0xF0, 0x83, 0xC1, 0x28, 0x83, 0xEA, 0x01, 0x75, 0xE3, 0x8D, 0x44, 0x24, 0x34, 0x50, 0xFF, 0xD3, 0x8B, 0x44, 0x24, 0x38, 0x8B, 0x5F, 0x50, 0x8D, 0x50, 0xFF, 0x8D, 0x48, 0xFF, 0xF7, 0xD2, 0x48, 0x03, 0xCE, 0x03, 0xC3, 0x23, 0xCA, 0x23, 0xC2, 0x3B, 0xC1, 0x75, 0x97, 0x6A, 0x04, 0x68, 0x00, 0x30, 0x00, 0x00, 0x53, 0x6A, 0x00, 0xFF, 0xD5, 0x8B, 0x77, 0x54, 0x8B, 0xD8, 0x8B, 0x44, 0x24, 0x5C, 0x33, 0xC9, 0x89, 0x44, 0x24, 0x14, 0x8B, 0xD3, 0x33, 0xC0, 0x89, 0x5C, 0x24, 0x18, 0x40, 0x89, 0x44, 0x24, 0x24, 0x85, 0xF6, 0x74, 0x37, 0x8B, 0x6C, 0x24, 0x6C, 0x8B, 0x5C, 0x24, 0x14, 0x23, 0xE8, 0x4E, 0x85, 0xED, 0x74, 0x19, 0x8B, 0xC7, 0x2B, 0x44, 0x24, 0x5C, 0x3B, 0xC8, 0x73, 0x0F, 0x83, 0xF9, 0x3C, 0x72, 0x05, 0x83, 0xF9, 0x3E, 0x76, 0x05, 0xC6, 0x02, 0x00, 0xEB, 0x04, 0x8A, 0x03, 0x88, 0x02, 0x41, 0x43, 0x42, 0x85, 0xF6, 0x75, 0xD7, 0x8B, 0x5C, 0x24, 0x18, 0x0F, 0xB7, 0x47, 0x06, 0x0F, 0xB7, 0x4F, 0x14, 0x85, 0xC0, 0x74, 0x38, 0x83, 0xC7, 0x2C, 0x03, 0xCF, 0x8B, 0x7C, 0x24, 0x5C, 0x8B, 0x51, 0xF8, 0x48, 0x8B, 0x31, 0x03, 0xD3, 0x8B, 0x69, 0xFC, 0x03, 0xF7, 0x89, 0x44, 0x24, 0x5C, 0x85, 0xED, 0x74, 0x0F, 0x8A, 0x06, 0x88, 0x02, 0x42, 0x46, 0x83, 0xED, 0x01, 0x75, 0xF5, 0x8B, 0x44, 0x24, 0x5C, 0x83, 0xC1, 0x28, 0x85, 0xC0, 0x75, 0xD5, 0x8B, 0x7C, 0x24, 0x10, 0x8B, 0xB7, 0x80, 0x00, 0x00, 0x00, 0x03, 0xF3, 0x89, 0x74, 0x24, 0x14, 0x8B, 0x46, 0x0C, 0x85, 0xC0, 0x74, 0x7D, 0x03, 0xC3, 0x50, 0xFF, 0x54, 0x24, 0x20, 0x8B, 0x6E, 0x10, 0x8B, 0xF8, 0x8B, 0x06, 0x03, 0xEB, 0x03, 0xC3, 0x89, 0x44, 0x24, 0x5C, 0x83, 0x7D, 0x00, 0x00, 0x74, 0x4F, 0x8B, 0x74, 0x24, 0x20, 0x8B, 0x08, 0x85, 0xC9, 0x74, 0x1E, 0x79, 0x1C, 0x8B, 0x47, 0x3C, 0x0F, 0xB7, 0xC9, 0x8B, 0x44, 0x38, 0x78, 0x2B, 0x4C, 0x38, 0x10, 0x8B, 0x44, 0x38, 0x1C, 0x8D, 0x04, 0x88, 0x8B, 0x04, 0x38, 0x03, 0xC7, 0xEB, 0x0C, 0x8B, 0x45, 0x00, 0x83, 0xC0, 0x02, 0x03, 0xC3, 0x50, 0x57, 0xFF, 0xD6, 0x89, 0x45, 0x00, 0x83, 0xC5, 0x04, 0x8B, 0x44, 0x24, 0x5C, 0x83, 0xC0, 0x04, 0x89, 0x44, 0x24, 0x5C, 0x83, 0x7D, 0x00, 0x00, 0x75, 0xB9, 0x8B, 0x74, 0x24, 0x14, 0x8B, 0x46, 0x20, 0x83, 0xC6, 0x14, 0x89, 0x74, 0x24, 0x14, 0x85, 0xC0, 0x75, 0x87, 0x8B, 0x7C, 0x24, 0x10, 0x8B, 0xEB, 0x2B, 0x6F, 0x34, 0x83, 0xBF, 0xA4, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x84, 0xAA, 0x00, 0x00, 0x00, 0x8B, 0x97, 0xA0, 0x00, 0x00, 0x00, 0x03, 0xD3, 0x89, 0x54, 0x24, 0x5C, 0x8D, 0x4A, 0x04, 0x8B, 0x01, 0x89, 0x4C, 0x24, 0x14, 0x85, 0xC0, 0x0F, 0x84, 0x8D, 0x00, 0x00, 0x00, 0x8B, 0x32, 0x8D, 0x78, 0xF8, 0x03, 0xF3, 0x8D, 0x42, 0x08, 0xD1, 0xEF, 0x89, 0x44, 0x24, 0x20, 0x74, 0x60, 0x6A, 0x02, 0x8B, 0xD8, 0x5A, 0x0F, 0xB7, 0x0B, 0x4F, 0x66, 0x8B, 0xC1, 0x66, 0xC1, 0xE8, 0x0C, 0x66, 0x83, 0xF8, 0x0A, 0x74, 0x06, 0x66, 0x83, 0xF8, 0x03, 0x75, 0x0B, 0x81, 0xE1, 0xFF, 0x0F, 0x00, 0x00, 0x01, 0x2C, 0x31, 0xEB, 0x27, 0x66, 0x3B, 0x44, 0x24, 0x24, 0x75, 0x11, 0x81, 0xE1, 0xFF, 0x0F, 0x00, 0x00, 0x8B, 0xC5, 0xC1, 0xE8, 0x10, 0x66, 0x01, 0x04, 0x31, 0xEB, 0x0F, 0x66, 0x3B, 0xC2, 0x75, 0x0A, 0x81, 0xE1, 0xFF, 0x0F, 0x00, 0x00, 0x66, 0x01, 0x2C, 0x31, 0x03, 0xDA, 0x85, 0xFF, 0x75, 0xB1, 0x8B, 0x5C, 0x24, 0x18, 0x8B, 0x54, 0x24, 0x5C, 0x8B, 0x4C, 0x24, 0x14, 0x03, 0x11, 0x89, 0x54, 0x24, 0x5C, 0x8D, 0x4A, 0x04, 0x8B, 0x01, 0x89, 0x4C, 0x24, 0x14, 0x85, 0xC0, 0x0F, 0x85, 0x77, 0xFF, 0xFF, 0xFF, 0x8B, 0x7C, 0x24, 0x10, 0x0F, 0xB7, 0x47, 0x06, 0x0F, 0xB7, 0x4F, 0x14, 0x85, 0xC0, 0x0F, 0x84, 0xB7, 0x00, 0x00, 0x00, 0x8B, 0x74, 0x24, 0x5C, 0x8D, 0x6F, 0x3C, 0x03, 0xE9, 0x48, 0x83, 0x7D, 0xEC, 0x00, 0x89, 0x44, 0x24, 0x24, 0x0F, 0x86, 0x94, 0x00, 0x00, 0x00, 0x8B, 0x4D, 0x00, 0x33, 0xD2, 0x42, 0x8B, 0xC1, 0xC1, 0xE8, 0x1D, 0x23, 0xC2, 0x8B, 0xD1, 0xC1, 0xEA, 0x1E, 0x83, 0xE2, 0x01, 0xC1, 0xE9, 0x1F, 0x85, 0xC0, 0x75, 0x18, 0x85, 0xD2, 0x75, 0x07, 0x6A, 0x08, 0x5E, 0x6A, 0x01, 0xEB, 0x05, 0x6A, 0x04, 0x5E, 0x6A, 0x02, 0x85, 0xC9, 0x58, 0x0F, 0x44, 0xF0, 0xEB, 0x2C, 0x85, 0xD2, 0x75, 0x17, 0x85, 0xC9, 0x75, 0x04, 0x6A, 0x10, 0xEB, 0x15, 0x85, 0xD2, 0x75, 0x0B, 0x85, 0xC9, 0x74, 0x18, 0xBE, 0x80, 0x00, 0x00, 0x00, 0xEB, 0x11, 0x85, 0xC9, 0x75, 0x05, 0x6A, 0x20, 0x5E, 0xEB, 0x08, 0x6A, 0x40, 0x85, 0xC9, 0x58, 0x0F, 0x45, 0xF0, 0x8B, 0x4D, 0x00, 0x8B, 0xC6, 0x0D, 0x00, 0x02, 0x00, 0x00, 0x81, 0xE1, 0x00, 0x00, 0x00, 0x04, 0x0F, 0x44, 0xC6, 0x8B, 0xF0, 0x8D, 0x44, 0x24, 0x28, 0x50, 0x8B, 0x45, 0xE8, 0x56, 0xFF, 0x75, 0xEC, 0x03, 0xC3, 0x50, 0xFF, 0x54, 0x24, 0x3C, 0x85, 0xC0, 0x0F, 0x84, 0xEC, 0xFC, 0xFF, 0xFF, 0x8B, 0x44, 0x24, 0x24, 0x83, 0xC5, 0x28, 0x85, 0xC0, 0x0F, 0x85, 0x52, 0xFF, 0xFF, 0xFF, 0x8B, 0x77, 0x28, 0x6A, 0x00, 0x6A, 0x00, 0x6A, 0xFF, 0x03, 0xF3, 0xFF, 0x54, 0x24, 0x3C, 0x33, 0xC0, 0x40, 0x50, 0x50, 0x53, 0xFF, 0xD6, 0x83, 0x7C, 0x24, 0x60, 0x00, 0x74, 0x7C, 0x83, 0x7F, 0x7C, 0x00, 0x74, 0x76, 0x8B, 0x4F, 0x78, 0x03, 0xCB, 0x8B, 0x41, 0x18, 0x85, 0xC0, 0x74, 0x6A, 0x83, 0x79, 0x14, 0x00, 0x74, 0x64, 0x8B, 0x69, 0x20, 0x8B, 0x79, 0x24, 0x03, 0xEB, 0x83, 0x64, 0x24, 0x5C, 0x00, 0x03, 0xFB, 0x85, 0xC0, 0x74, 0x51, 0x8B, 0x75, 0x00, 0x03, 0xF3, 0x33, 0xD2, 0x0F, 0xBE, 0x06, 0xC1, 0xCA, 0x0D, 0x03, 0xD0, 0x46, 0x80, 0x7E, 0xFF, 0x00, 0x75, 0xF1, 0x39, 0x54, 0x24, 0x60, 0x74, 0x16, 0x8B, 0x44, 0x24, 0x5C, 0x83, 0xC5, 0x04, 0x40, 0x83, 0xC7, 0x02, 0x89, 0x44, 0x24, 0x5C, 0x3B, 0x41, 0x18, 0x72, 0xD0, 0xEB, 0x1F, 0x0F, 0xB7, 0x17, 0x83, 0xFA, 0xFF, 0x74, 0x17, 0x8B, 0x41, 0x1C, 0xFF, 0x74, 0x24, 0x68, 0xFF, 0x74, 0x24, 0x68, 0x8D, 0x04, 0x90, 0x8B, 0x04, 0x18, 0x03, 0xC3, 0xFF, 0xD0, 0x59, 0x59, 0x8B, 0xC3, 0x5F, 0x5E, 0x5D, 0x5B, 0x83, 0xC4, 0x48, 0xC3, 0x83, 0xEC, 0x10, 0x64, 0xA1, 0x30, 0x00, 0x00, 0x00, 0x53, 0x55, 0x56, 0x8B, 0x40, 0x0C, 0x57, 0x89, 0x4C, 0x24, 0x18, 0x8B, 0x70, 0x0C, 0xE9, 0x8A, 0x00, 0x00, 0x00, 0x8B, 0x46, 0x30, 0x33, 0xC9, 0x8B, 0x5E, 0x2C, 0x8B, 0x36, 0x89, 0x44, 0x24, 0x14, 0x8B, 0x42, 0x3C, 0x8B, 0x6C, 0x10, 0x78, 0x89, 0x6C, 0x24, 0x10, 0x85, 0xED, 0x74, 0x6D, 0xC1, 0xEB, 0x10, 0x33, 0xFF, 0x85, 0xDB, 0x74, 0x1F, 0x8B, 0x6C, 0x24, 0x14, 0x8A, 0x04, 0x2F, 0xC1, 0xC9, 0x0D, 0x3C, 0x61, 0x0F, 0xBE, 0xC0, 0x7C, 0x03, 0x83, 0xC1, 0xE0, 0x03, 0xC8, 0x47, 0x3B, 0xFB, 0x72, 0xE9, 0x8B, 0x6C, 0x24, 0x10, 0x8B, 0x44, 0x2A, 0x20, 0x33, 0xDB, 0x8B, 0x7C, 0x2A, 0x18, 0x03, 0xC2, 0x89, 0x7C, 0x24, 0x14, 0x85, 0xFF, 0x74, 0x31, 0x8B, 0x28, 0x33, 0xFF, 0x03, 0xEA, 0x83, 0xC0, 0x04, 0x89, 0x44, 0x24, 0x1C, 0x0F, 0xBE, 0x45, 0x00, 0xC1, 0xCF, 0x0D, 0x03, 0xF8, 0x45, 0x80, 0x7D, 0xFF, 0x00, 0x75, 0xF0, 0x8D, 0x04, 0x0F, 0x3B, 0x44, 0x24, 0x18, 0x74, 0x20, 0x8B, 0x44, 0x24, 0x1C, 0x43, 0x3B, 0x5C, 0x24, 0x14, 0x72, 0xCF, 0x8B, 0x56, 0x18, 0x85, 0xD2, 0x0F, 0x85, 0x6B, 0xFF, 0xFF, 0xFF, 0x33, 0xC0, 0x5F, 0x5E, 0x5D, 0x5B, 0x83, 0xC4, 0x10, 0xC3, 0x8B, 0x74, 0x24, 0x10, 0x8B, 0x44, 0x16, 0x24, 0x8D, 0x04, 0x58, 0x0F, 0xB7, 0x0C, 0x10, 0x8B, 0x44, 0x16, 0x1C, 0x8D, 0x04, 0x88, 0x8B, 0x04, 0x10, 0x03, 0xC2, 0xEB, 0xDB}
rdiShellcode64 := []byte{0x48, 0x8B, 0xC4, 0x44, 0x89, 0x48, 0x20, 0x4C, 0x89, 0x40, 0x18, 0x89, 0x50, 0x10, 0x53, 0x55, 0x56, 0x57, 0x41, 0x54, 0x41, 0x55, 0x41, 0x56, 0x41, 0x57, 0x48, 0x83, 0xEC, 0x78, 0x83, 0x60, 0x08, 0x00, 0x48, 0x8B, 0xE9, 0xB9, 0x4C, 0x77, 0x26, 0x07, 0x44, 0x8B, 0xFA, 0x33, 0xDB, 0xE8, 0xA4, 0x04, 0x00, 0x00, 0xB9, 0x49, 0xF7, 0x02, 0x78, 0x4C, 0x8B, 0xE8, 0xE8, 0x97, 0x04, 0x00, 0x00, 0xB9, 0x58, 0xA4, 0x53, 0xE5, 0x48, 0x89, 0x44, 0x24, 0x20, 0xE8, 0x88, 0x04, 0x00, 0x00, 0xB9, 0x10, 0xE1, 0x8A, 0xC3, 0x48, 0x8B, 0xF0, 0xE8, 0x7B, 0x04, 0x00, 0x00, 0xB9, 0xAF, 0xB1, 0x5C, 0x94, 0x48, 0x89, 0x44, 0x24, 0x30, 0xE8, 0x6C, 0x04, 0x00, 0x00, 0xB9, 0x33, 0x00, 0x9E, 0x95, 0x48, 0x89, 0x44, 0x24, 0x28, 0x4C, 0x8B, 0xE0, 0xE8, 0x5A, 0x04, 0x00, 0x00, 0x48, 0x63, 0x7D, 0x3C, 0x4C, 0x8B, 0xD0, 0x48, 0x03, 0xFD, 0x81, 0x3F, 0x50, 0x45, 0x00, 0x00, 0x74, 0x07, 0x33, 0xC0, 0xE9, 0x2D, 0x04, 0x00, 0x00, 0xB8, 0x64, 0x86, 0x00, 0x00, 0x66, 0x39, 0x47, 0x04, 0x75, 0xEE, 0x41, 0xBE, 0x01, 0x00, 0x00, 0x00, 0x44, 0x84, 0x77, 0x38, 0x75, 0xE2, 0x0F, 0xB7, 0x47, 0x06, 0x0F, 0xB7, 0x4F, 0x14, 0x44, 0x8B, 0x4F, 0x38, 0x85, 0xC0, 0x74, 0x2C, 0x48, 0x8D, 0x57, 0x24, 0x44, 0x8B, 0xC0, 0x48, 0x03, 0xD1, 0x8B, 0x4A, 0x04, 0x85, 0xC9, 0x75, 0x07, 0x8B, 0x02, 0x49, 0x03, 0xC1, 0xEB, 0x04, 0x8B, 0x02, 0x03, 0xC1, 0x48, 0x3B, 0xC3, 0x48, 0x0F, 0x47, 0xD8, 0x48, 0x83, 0xC2, 0x28, 0x4D, 0x2B, 0xC6, 0x75, 0xDE, 0x48, 0x8D, 0x4C, 0x24, 0x38, 0x41, 0xFF, 0xD2, 0x44, 0x8B, 0x44, 0x24, 0x3C, 0x44, 0x8B, 0x4F, 0x50, 0x41, 0x8D, 0x40, 0xFF, 0xF7, 0xD0, 0x41, 0x8D, 0x50, 0xFF, 0x41, 0x03, 0xD1, 0x49, 0x8D, 0x48, 0xFF, 0x48, 0x23, 0xD0, 0x48, 0x03, 0xCB, 0x49, 0x8D, 0x40, 0xFF, 0x48, 0xF7, 0xD0, 0x48, 0x23, 0xC8, 0x48, 0x3B, 0xD1, 0x0F, 0x85, 0x6B, 0xFF, 0xFF, 0xFF, 0x33, 0xC9, 0x41, 0x8B, 0xD1, 0x41, 0xB8, 0x00, 0x30, 0x00, 0x00, 0x44, 0x8D, 0x49, 0x04, 0xFF, 0xD6, 0x44, 0x8B, 0x47, 0x54, 0x33, 0xD2, 0x48, 0x8B, 0xF0, 0x4C, 0x8B, 0xD5, 0x48, 0x8B, 0xC8, 0x44, 0x8D, 0x5A, 0x02, 0x4D, 0x85, 0xC0, 0x74, 0x3F, 0x44, 0x8B, 0x8C, 0x24, 0xE0, 0x00, 0x00, 0x00, 0x45, 0x23, 0xCE, 0x4D, 0x2B, 0xC6, 0x45, 0x85, 0xC9, 0x74, 0x19, 0x48, 0x8B, 0xC7, 0x48, 0x2B, 0xC5, 0x48, 0x3B, 0xD0, 0x73, 0x0E, 0x48, 0x8D, 0x42, 0xC4, 0x49, 0x3B, 0xC3, 0x76, 0x05, 0xC6, 0x01, 0x00, 0xEB, 0x05, 0x41, 0x8A, 0x02, 0x88, 0x01, 0x49, 0x03, 0xD6, 0x4D, 0x03, 0xD6, 0x49, 0x03, 0xCE, 0x4D, 0x85, 0xC0, 0x75, 0xCC, 0x44, 0x0F, 0xB7, 0x57, 0x06, 0x0F, 0xB7, 0x47, 0x14, 0x4D, 0x85, 0xD2, 0x74, 0x38, 0x48, 0x8D, 0x4F, 0x2C, 0x48, 0x03, 0xC8, 0x8B, 0x51, 0xF8, 0x4D, 0x2B, 0xD6, 0x44, 0x8B, 0x01, 0x48, 0x03, 0xD6, 0x44, 0x8B, 0x49, 0xFC, 0x4C, 0x03, 0xC5, 0x4D, 0x85, 0xC9, 0x74, 0x10, 0x41, 0x8A, 0x00, 0x4D, 0x03, 0xC6, 0x88, 0x02, 0x49, 0x03, 0xD6, 0x4D, 0x2B, 0xCE, 0x75, 0xF0, 0x48, 0x83, 0xC1, 0x28, 0x4D, 0x85, 0xD2, 0x75, 0xCF, 0x8B, 0x9F, 0x90, 0x00, 0x00, 0x00, 0x48, 0x03, 0xDE, 0x8B, 0x43, 0x0C, 0x85, 0xC0, 0x0F, 0x84, 0x8A, 0x00, 0x00, 0x00, 0x48, 0x8B, 0x6C, 0x24, 0x20, 0x8B, 0xC8, 0x48, 0x03, 0xCE, 0x41, 0xFF, 0xD5, 0x44, 0x8B, 0x3B, 0x4C, 0x8B, 0xE0, 0x44, 0x8B, 0x73, 0x10, 0x4C, 0x03, 0xFE, 0x4C, 0x03, 0xF6, 0xEB, 0x49, 0x49, 0x83, 0x3F, 0x00, 0x7D, 0x29, 0x49, 0x63, 0x44, 0x24, 0x3C, 0x41, 0x0F, 0xB7, 0x17, 0x42, 0x8B, 0x8C, 0x20, 0x88, 0x00, 0x00, 0x00, 0x42, 0x8B, 0x44, 0x21, 0x10, 0x42, 0x8B, 0x4C, 0x21, 0x1C, 0x48, 0x2B, 0xD0, 0x49, 0x03, 0xCC, 0x8B, 0x04, 0x91, 0x49, 0x03, 0xC4, 0xEB, 0x0F, 0x49, 0x8B, 0x16, 0x49, 0x8B, 0xCC, 0x48, 0x83, 0xC2, 0x02, 0x48, 0x03, 0xD6, 0xFF, 0xD5, 0x49, 0x89, 0x06, 0x49, 0x83, 0xC6, 0x08, 0x49, 0x83, 0xC7, 0x08, 0x49, 0x83, 0x3E, 0x00, 0x75, 0xB1, 0x8B, 0x43, 0x20, 0x48, 0x83, 0xC3, 0x14, 0x85, 0xC0, 0x75, 0x8C, 0x44, 0x8B, 0xBC, 0x24, 0xC8, 0x00, 0x00, 0x00, 0x44, 0x8D, 0x70, 0x01, 0x4C, 0x8B, 0x64, 0x24, 0x28, 0x4C, 0x8B, 0xCE, 0x41, 0xBD, 0x02, 0x00, 0x00, 0x00, 0x4C, 0x2B, 0x4F, 0x30, 0x83, 0xBF, 0xB4, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x84, 0x95, 0x00, 0x00, 0x00, 0x8B, 0x97, 0xB0, 0x00, 0x00, 0x00, 0x48, 0x03, 0xD6, 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0x77, 0x3C, 0x4C, 0x8B, 0x6C, 0x24, 0x30, 0x4C, 0x03, 0xF0, 0x48, 0xFF, 0xCD, 0x41, 0x83, 0x7E, 0xEC, 0x00, 0x0F, 0x86, 0x9D, 0x00, 0x00, 0x00, 0x45, 0x8B, 0x06, 0x41, 0x8B, 0xD0, 0xC1, 0xEA, 0x1E, 0x41, 0x8B, 0xC0, 0x41, 0x8B, 0xC8, 0xC1, 0xE8, 0x1D, 0x83, 0xE2, 0x01, 0xC1, 0xE9, 0x1F, 0x83, 0xE0, 0x01, 0x75, 0x1E, 0x85, 0xD2, 0x75, 0x0B, 0xF7, 0xD9, 0x1B, 0xDB, 0x83, 0xE3, 0x07, 0xFF, 0xC3, 0xEB, 0x3E, 0xF7, 0xD9, 0xB8, 0x02, 0x00, 0x00, 0x00, 0x1B, 0xDB, 0x23, 0xD8, 0x03, 0xD8, 0xEB, 0x2F, 0x85, 0xD2, 0x75, 0x18, 0x85, 0xC9, 0x75, 0x05, 0x8D, 0x5A, 0x10, 0xEB, 0x22, 0x85, 0xD2, 0x75, 0x0B, 0x85, 0xC9, 0x74, 0x1A, 0xBB, 0x80, 0x00, 0x00, 0x00, 0xEB, 0x13, 0x85, 0xC9, 0x75, 0x05, 0x8D, 0x59, 0x20, 0xEB, 0x0A, 0x85, 0xC9, 0xB8, 0x40, 0x00, 0x00, 0x00, 0x0F, 0x45, 0xD8, 0x41, 0x8B, 0x4E, 0xE8, 0x4C, 0x8D, 0x8C, 0x24, 0xC0, 0x00, 0x00, 0x00, 0x41, 0x8B, 0x56, 0xEC, 0x8B, 0xC3, 0x0F, 0xBA, 0xE8, 0x09, 0x41, 0x81, 0xE0, 0x00, 0x00, 0x00, 0x04, 0x0F, 0x44, 0xC3, 0x48, 0x03, 0xCE, 0x44, 0x8B, 0xC0, 0x8B, 0xD8, 0x41, 0xFF, 0xD5, 0x85, 0xC0, 0x0F, 0x84, 0xA1, 0xFC, 0xFF, 0xFF, 0x49, 0x83, 0xC6, 0x28, 0x48, 0x85, 0xED, 0x0F, 0x85, 0x48, 0xFF, 0xFF, 0xFF, 0x44, 0x8D, 0x6D, 0x02, 0x8B, 0x5F, 0x28, 0x45, 0x33, 0xC0, 0x33, 0xD2, 0x48, 0x83, 0xC9, 0xFF, 0x48, 0x03, 0xDE, 0x41, 0xFF, 0xD4, 0xBD, 0x01, 0x00, 0x00, 0x00, 0x48, 0x8B, 0xCE, 0x44, 0x8B, 0xC5, 0x8B, 0xD5, 0xFF, 0xD3, 0x45, 0x85, 0xFF, 0x0F, 0x84, 0x97, 0x00, 0x00, 0x00, 0x83, 0xBF, 0x8C, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x84, 0x8A, 0x00, 0x00, 0x00, 0x8B, 0x97, 0x88, 0x00, 0x00, 0x00, 0x48, 0x03, 0xD6, 0x44, 0x8B, 0x5A, 0x18, 0x45, 0x85, 0xDB, 0x74, 0x78, 0x83, 0x7A, 0x14, 0x00, 0x74, 0x72, 0x44, 0x8B, 0x52, 0x20, 0x33, 0xDB, 0x44, 0x8B, 0x4A, 0x24, 0x4C, 0x03, 0xD6, 0x4C, 0x03, 0xCE, 0x45, 0x85, 0xDB, 0x74, 0x5D, 0x45, 0x8B, 0x02, 0x4C, 0x03, 0xC6, 0x33, 0xC9, 0x41, 0x0F, 0xBE, 0x00, 0x4C, 0x03, 0xC5, 0xC1, 0xC9, 0x0D, 0x03, 0xC8, 0x41, 0x80, 0x78, 0xFF, 0x00, 0x75, 0xED, 0x44, 0x3B, 0xF9, 0x74, 0x10, 0x03, 0xDD, 0x49, 0x83, 0xC2, 0x04, 0x4D, 0x03, 0xCD, 0x41, 0x3B, 0xDB, 0x72, 0xD2, 0xEB, 0x2D, 0x41, 0x0F, 0xB7, 0x01, 0x83, 0xF8, 0xFF, 0x74, 0x24, 0x8B, 0x52, 0x1C, 0x48, 0x8B, 0x8C, 0x24, 0xD0, 0x00, 0x00, 0x00, 0xC1, 0xE0, 0x02, 0x48, 0x98, 0x48, 0x03, 0xC6, 0x44, 0x8B, 0x04, 0x02, 0x8B, 0x94, 0x24, 0xD8, 0x00, 0x00, 0x00, 0x4C, 0x03, 0xC6, 0x41, 0xFF, 0xD0, 0x48, 0x8B, 0xC6, 0x48, 0x83, 0xC4, 0x78, 0x41, 0x5F, 0x41, 0x5E, 0x41, 0x5D, 0x41, 0x5C, 0x5F, 0x5E, 0x5D, 0x5B, 0xC3, 0xCC, 0xCC, 0xCC, 0x48, 0x89, 0x5C, 0x24, 0x08, 0x48, 0x89, 0x74, 0x24, 0x10, 0x57, 0x48, 0x83, 0xEC, 0x10, 0x65, 0x48, 0x8B, 0x04, 0x25, 0x60, 0x00, 0x00, 0x00, 0x8B, 0xF1, 0x48, 0x8B, 0x50, 0x18, 0x4C, 0x8B, 0x4A, 0x10, 0x4D, 0x8B, 0x41, 0x30, 0x4D, 0x85, 0xC0, 0x0F, 0x84, 0xB4, 0x00, 0x00, 0x00, 0x41, 0x0F, 0x10, 0x41, 0x58, 0x49, 0x63, 0x40, 0x3C, 0x33, 0xD2, 0x4D, 0x8B, 0x09, 0xF3, 0x0F, 0x7F, 0x04, 0x24, 0x42, 0x8B, 0x9C, 0x00, 0x88, 0x00, 0x00, 0x00, 0x85, 0xDB, 0x74, 0xD4, 0x48, 0x8B, 0x04, 0x24, 0x48, 0xC1, 0xE8, 0x10, 0x44, 0x0F, 0xB7, 0xD0, 0x45, 0x85, 0xD2, 0x74, 0x21, 0x48, 0x8B, 0x4C, 0x24, 0x08, 0x45, 0x8B, 0xDA, 0x0F, 0xBE, 0x01, 0xC1, 0xCA, 0x0D, 0x80, 0x39, 0x61, 0x7C, 0x03, 0x83, 0xC2, 0xE0, 0x03, 0xD0, 0x48, 0xFF, 0xC1, 0x49, 0x83, 0xEB, 0x01, 0x75, 0xE7, 0x4D, 0x8D, 0x14, 0x18, 0x33, 0xC9, 0x41, 0x8B, 0x7A, 0x20, 0x49, 0x03, 0xF8, 0x41, 0x39, 0x4A, 0x18, 0x76, 0x8F, 0x8B, 0x1F, 0x45, 0x33, 0xDB, 0x49, 0x03, 0xD8, 0x48, 0x8D, 0x7F, 0x04, 0x0F, 0xBE, 0x03, 0x48, 0xFF, 0xC3, 0x41, 0xC1, 0xCB, 0x0D, 0x44, 0x03, 0xD8, 0x80, 0x7B, 0xFF, 0x00, 0x75, 0xED, 0x41, 0x8D, 0x04, 0x13, 0x3B, 0xC6, 0x74, 0x0D, 0xFF, 0xC1, 0x41, 0x3B, 0x4A, 0x18, 0x72, 0xD1, 0xE9, 0x5B, 0xFF, 0xFF, 0xFF, 0x41, 0x8B, 0x42, 0x24, 0x03, 0xC9, 0x49, 0x03, 0xC0, 0x0F, 0xB7, 0x14, 0x01, 0x41, 0x8B, 0x4A, 0x1C, 0x49, 0x03, 0xC8, 0x8B, 0x04, 0x91, 0x49, 0x03, 0xC0, 0xEB, 0x02, 0x33, 0xC0, 0x48, 0x8B, 0x5C, 0x24, 0x20, 0x48, 0x8B, 0x74, 0x24, 0x28, 0x48, 0x83, 0xC4, 0x10, 0x5F, 0xC3}
if userData == nil {
userData = []byte("None")
}
var final []byte
if is64BitDLL(dllBytes) {
// do 64 bit things
bootstrapSize := 64
// call next instruction (Pushes next instruction address to stack)
bootstrap := []byte{0xe8, 0x00, 0x00, 0x00, 0x00}
// Set the offset to our DLL from pop result
dllOffset := bootstrapSize - len(bootstrap) + len(rdiShellcode64)
// pop rcx - Capture our current location in memory
bootstrap = append(bootstrap, 0x59)
// mov r8, rcx - copy our location in memory to r8 before we start modifying RCX
bootstrap = append(bootstrap, 0x49, 0x89, 0xc8)
// add rcx, <Offset of the DLL>
bootstrap = append(bootstrap, 0x48, 0x81, 0xc1)
bootstrap = append(bootstrap, pack(uint32(dllOffset))...)
// mov edx, <Hash of function>
bootstrap = append(bootstrap, 0xba)
bootstrap = append(bootstrap, functionHash...)
// Setup the location of our user data
// add r8, <Offset of the DLL> + <Length of DLL>
bootstrap = append(bootstrap, 0x49, 0x81, 0xc0)
userDataLocation := dllOffset + len(dllBytes)
bootstrap = append(bootstrap, pack(uint32(userDataLocation))...)
// mov r9d, <Length of User Data>
bootstrap = append(bootstrap, 0x41, 0xb9)
bootstrap = append(bootstrap, pack(uint32(len(userData)))...)
// push rsi - save original value
bootstrap = append(bootstrap, 0x56)
// mov rsi, rsp - store our current stack pointer for later
bootstrap = append(bootstrap, 0x48, 0x89, 0xe6)
// and rsp, 0x0FFFFFFFFFFFFFFF0 - Align the stack to 16 bytes
bootstrap = append(bootstrap, 0x48, 0x83, 0xe4, 0xf0)
// sub rsp, 0x30 - Create some breathing room on the stack
bootstrap = append(bootstrap, 0x48, 0x83, 0xec)
bootstrap = append(bootstrap, 0x30) // 32 bytes for shadow space + 8 bytes for last arg + 8 bytes for stack alignment
// mov dword ptr [rsp + 0x20], <Flags> - Push arg 5 just above shadow space
bootstrap = append(bootstrap, 0xC7, 0x44, 0x24)
bootstrap = append(bootstrap, 0x20)
bootstrap = append(bootstrap, pack(uint32(flags))...)
// call - Transfer execution to the RDI
bootstrap = append(bootstrap, 0xe8)
bootstrap = append(bootstrap, byte(bootstrapSize-len(bootstrap)-4)) // Skip over the remainder of instructions
bootstrap = append(bootstrap, 0x00, 0x00, 0x00)
// mov rsp, rsi - Reset our original stack pointer
bootstrap = append(bootstrap, 0x48, 0x89, 0xf4)
// pop rsi - Put things back where we left them
bootstrap = append(bootstrap, 0x5e)
// ret - return to caller
bootstrap = append(bootstrap, 0xc3)
final = append(bootstrap, rdiShellcode64...)
final = append(final, dllBytes...)
final = append(final, userData...)
} else {
// do 32 bit things
bootstrapSize := 45
// call next instruction (Pushes next instruction address to stack)
bootstrap := []byte{0xe8, 0x00, 0x00, 0x00, 0x00}
// Set the offset to our DLL from pop result
dllOffset := bootstrapSize - len(bootstrap) + len(rdiShellcode32)
// pop eax - Capture our current location in memory
bootstrap = append(bootstrap, 0x58)
// mov ebx, eax - copy our location in memory to ebx before we start modifying eax
bootstrap = append(bootstrap, 0x89, 0xc3)
// add eax, <Offset to the DLL>
bootstrap = append(bootstrap, 0x05)
bootstrap = append(bootstrap, pack(uint32(dllOffset))...)
// add ebx, <Offset to the DLL> + <Size of DLL>
bootstrap = append(bootstrap, 0x81, 0xc3)
userDataLocation := dllOffset + len(dllBytes)
bootstrap = append(bootstrap, pack(uint32(userDataLocation))...)
// push <Flags>
bootstrap = append(bootstrap, 0x68)
bootstrap = append(bootstrap, pack(uint32(flags))...)
// push <Length of User Data>
bootstrap = append(bootstrap, 0x68)
bootstrap = append(bootstrap, pack(uint32(len(userData)))...)
// push ebx
bootstrap = append(bootstrap, 0x53)
// push <hash of function>
bootstrap = append(bootstrap, 0x68)
bootstrap = append(bootstrap, functionHash...)
// push eax
bootstrap = append(bootstrap, 0x50)
// call - Transfer execution to the RDI
bootstrap = append(bootstrap, 0xe8)
bootstrap = append(bootstrap, byte(bootstrapSize-len(bootstrap)-4)) // Skip over the remainder of instructions
bootstrap = append(bootstrap, 0x00, 0x00, 0x00)
// add esp, 0x14 - correct the stack pointer
bootstrap = append(bootstrap, 0x83, 0xc4, 0x14)
// ret - return to caller
bootstrap = append(bootstrap, 0xc3)
final = append(bootstrap, rdiShellcode32...)
final = append(final, dllBytes...)
final = append(final, userData...)
}
return final
}
// helper function similar to struct.pack from python3
func pack(val uint32) []byte {
bytes := make([]byte, 4)
binary.LittleEndian.PutUint32(bytes, val)
return bytes
}
// "HelloWorld" = 3571859646
func hashFunctionName(name string) uint32 {
function := []byte(name)
function = append(function, 0x00)
functionHash := uint32(0)
for _, b := range function {
functionHash = ror(functionHash, 13, 32)
functionHash += uint32(b)
}
return functionHash
}
// ROR-13 implementation
func ror(val uint32, rBits uint32, maxBits uint32) uint32 {
exp := uint32(math.Exp2(float64(maxBits))) - 1
return ((val & exp) >> (rBits % maxBits)) | (val << (maxBits - (rBits % maxBits)) & exp)
}
func is64BitDLL(dllBytes []byte) bool {
machineIA64 := uint16(512)
machineAMD64 := uint16(34404)
headerOffset := binary.LittleEndian.Uint32(dllBytes[60:64])
machine := binary.LittleEndian.Uint16(dllBytes[headerOffset+4 : headerOffset+4+2])
// 64 bit
if machine == machineIA64 || machine == machineAMD64 {
return true
}
return false
}
func readFile(path string) ([]byte, error) {
fileBytes, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return fileBytes, nil
}
func writeFile(filename string, contents []byte) error {
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(contents)
if err != nil {
return err
}
return nil
}
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