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package main
import (
"encoding/hex"
"fmt"
uc "github.com/unicorn-engine/unicorn/bindings/go/unicorn"
"strings"
)
var asm = strings.Join([]string{
"48c7c003000000", // mov rax, 3
"0f05", // syscall
"48c7c700400000", // mov rdi, 0x4000
"488907", // mov [rdi], rdx
"488b07", // mov rdx, [rdi]
"4883c201", // add rdx, 1
}, "")
func addHooks(mu uc.Unicorn) {
mu.HookAdd(uc.HOOK_BLOCK, func(mu uc.Unicorn, addr uint64, size uint32) {
fmt.Printf("Block: 0x%x, 0x%x\n", addr, size)
}, 1, 0)
mu.HookAdd(uc.HOOK_CODE, func(mu uc.Unicorn, addr uint64, size uint32) {
fmt.Printf("Code: 0x%x, 0x%x\n", addr, size)
}, 1, 0)
mu.HookAdd(uc.HOOK_MEM_READ|uc.HOOK_MEM_WRITE, func(mu uc.Unicorn, access int, addr uint64, size int, value int64) {
if access == uc.MEM_WRITE {
fmt.Printf("Mem write")
} else {
fmt.Printf("Mem read")
}
fmt.Printf(": @0x%x, 0x%x = 0x%x\n", addr, size, value)
}, 1, 0)
invalid := uc.HOOK_MEM_READ_INVALID | uc.HOOK_MEM_WRITE_INVALID | uc.HOOK_MEM_FETCH_INVALID
mu.HookAdd(invalid, func(mu uc.Unicorn, access int, addr uint64, size int, value int64) bool {
switch access {
case uc.MEM_WRITE_UNMAPPED | uc.MEM_WRITE_PROT:
fmt.Printf("invalid write")
case uc.MEM_READ_UNMAPPED | uc.MEM_READ_PROT:
fmt.Printf("invalid read")
case uc.MEM_FETCH_UNMAPPED | uc.MEM_FETCH_PROT:
fmt.Printf("invalid fetch")
default:
fmt.Printf("unknown memory error")
}
fmt.Printf(": @0x%x, 0x%x = 0x%x\n", addr, size, value)
return false
}, 1, 0)
mu.HookAdd(uc.HOOK_INSN, func(mu uc.Unicorn) {
rax, _ := mu.RegRead(uc.X86_REG_RAX)
fmt.Printf("Syscall: %d\n", rax)
}, 1, 0, uc.X86_INS_SYSCALL)
}
func run() error {
code, err := hex.DecodeString(asm)
if err != nil {
return err
}
// set up unicorn instance and add hooks
mu, err := uc.NewUnicorn(uc.ARCH_X86, uc.MODE_64)
if err != nil {
return err
}
addHooks(mu)
// map and write code to memory
if err := mu.MemMap(0x1000, 0x1000); err != nil {
return err
}
if err := mu.MemWrite(0x1000, code); err != nil {
return err
}
// map scratch space
if err := mu.MemMap(0x4000, 0x1000); err != nil {
return err
}
// set example register
if err := mu.RegWrite(uc.X86_REG_RDX, 1); err != nil {
return err
}
rdx, err := mu.RegRead(uc.X86_REG_RDX)
if err != nil {
return err
}
fmt.Printf("RDX is: %d\n", rdx)
// start emulation
if err := mu.Start(0x1000, 0x1000+uint64(len(code))); err != nil {
return err
}
// read back example register
rdx, err = mu.RegRead(uc.X86_REG_RDX)
if err != nil {
return err
}
fmt.Printf("RDX is now: %d\n", rdx)
return nil
}
func main() {
if err := run(); err != nil {
fmt.Println(err)
}
}
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