57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
|
#include <windows.h>
|
||
|
|
#include <iostream>
|
||
|
|
#include <fstream>
|
||
|
|
|
||
|
|
#define VERBOSE 1
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
if (argc != 2)
|
||
|
|
{
|
||
|
|
std::cout << "[?] Usage: " << argv[0] << " <shellcode-path>" << std::endl;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef VERBOSE
|
||
|
|
std::cout << "[+] Reading shellcode from " << argv[1] << std::endl;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
std::ifstream shellcode(argv[1]);
|
||
|
|
|
||
|
|
if (!shellcode.is_open())
|
||
|
|
{
|
||
|
|
std::cout << "[!] Failed to open " << argv[1] << std::endl;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
shellcode.seekg(0, std::ios::end);
|
||
|
|
size_t filesize = shellcode.tellg();
|
||
|
|
shellcode.seekg(0, std::ios::beg);
|
||
|
|
|
||
|
|
auto buffer = new char[filesize];
|
||
|
|
shellcode.read(buffer, filesize);
|
||
|
|
|
||
|
|
auto base = VirtualAlloc(nullptr, filesize, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
|
||
|
|
|
||
|
|
if (!base)
|
||
|
|
{
|
||
|
|
std::cout << "[!] Failed to allocate memory" << std::endl;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef VERBOSE
|
||
|
|
std::cout << "[+] Allocated " << filesize << " bytes at " << base << std::endl;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
std::copy(buffer, buffer + filesize, static_cast<char *>(base));
|
||
|
|
|
||
|
|
#ifdef VERBOSE
|
||
|
|
std::cout << "[+] Copied shellcode to " << base << std::endl;
|
||
|
|
std::cout << "[+] Executing 'jmp " << base << "'" << std::endl;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
__asm__("jmp *%0" ::"r"(base));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|