Programm im Speicher erzeugen und ausführen

abc.w

Ach so, eine richtige exe soll es sein, habe ich überlesen. Dann... keine Ahnung...

punky

vielleicht schaust mal im ReactOS source code wie CreateProcess() funktioniert, da die exe ja sowieso zuerst in den speicher geladen wird damit sie überhaupt ausführbar ist. alles andere sollte sich dann ergeben, oder FreeDOS wie die exe laden... etc..

helferlein

mittlerweile habe ich es geschafft, kernel32 funktionen erfolgreich
umzubiegen. allerdings scheint weder CreateProcess noch LoadLibrary
auf dateifunktionen wie CreateFile zurückzugreifen.

wie machen die das? ich versuche grade die ntdll funktionen zu hooken.
vielleicht klappt das ja.

MaxGru

du musst dazu nicht zwingend createprocess umschreiben,es sind nur folgende schritte nötig:

- .exe einlesen (optional)
- entsprechend speicher allocieren für dos/ntheader
- header in allocierten speicher kopieren,sections richtig erstellen
- STARTUPINFO/PROCESS_INFORMATION/CONTEXT richtig setzen
- CreateProcess aufrufen

poc code dazu:

//--------------------------------------------------------
// Dynamic Process Forking of Portable Executable
// Author : Vrillon / Venus
// Date   : 07/14/2008
//--------------------------------------------------------
/*********************************************************/
/* With this header, you can create and run a process    */
/* from memory and not from a file.                      */
/*********************************************************/

#ifdef WIN32
    #include <windows.h>
#else
    #error Process Forking Requires a Windows Operating System
#endif

#include <stdio.h>

/////////////////////////////////////////////////////////////
// NtUnmapViewOfSection (ZwUnmapViewOfSection)
// Used to unmap a section from a process.
typedef long int (__stdcall* NtUnmapViewOfSectionF)(HANDLE,PVOID);
NtUnmapViewOfSectionF NtUnmapViewOfSection = (NtUnmapViewOfSectionF)GetProcAddress(LoadLibrary("ntdll.dll"),"NtUnmapViewOfSection");

/////////////////////////////////////////////////////////////
// Fork Process
// Dynamically create a process based on the parameter 'lpImage'. The parameter should have the entire
// image of a portable executable file from address 0 to the end.
bool ForkProcess(LPVOID lpImage)
{
    // Variables for Process Forking
    long int                lWritten;
    long int                lHeaderSize;
    long int                lImageSize;
    long int                lSectionCount;
    long int                lSectionSize;
    long int                lFirstSection;
    long int                lPreviousProtection;
    long int                lJumpSize;

    bool                    bReturnValue;

    LPVOID                    lpImageMemory;
    LPVOID                    lpImageMemoryDummy;

    IMAGE_DOS_HEADER        dsDosHeader;
    IMAGE_NT_HEADERS        ntNtHeader;
    IMAGE_SECTION_HEADER    shSections[512 * 2];

    PROCESS_INFORMATION        piProcessInformation;
    STARTUPINFO                suStartUpInformation;

    CONTEXT                    cContext;

    // Variables for Local Process
    FILE*                    fFile;
    char*                    pProcessName;

    long int                lFileSize;
    long int                lLocalImageBase;
    long int                lLocalImageSize;

    LPVOID                    lpLocalFile;

    IMAGE_DOS_HEADER        dsLocalDosHeader;
    IMAGE_NT_HEADERS        ntLocalNtHeader;

    /////////////////////////////////////////////////////////////////
    // End Variable Definition

    bReturnValue = false;

    pProcessName = new char[MAX_PATH];
    ZeroMemory(pProcessName,MAX_PATH);

    // Get the file name for the dummy process
    if(GetModuleFileName(NULL,pProcessName,MAX_PATH) == 0)
    {
        delete [] pProcessName;
        return bReturnValue;
    }

    // Open the dummy process in binary mode
    fFile = fopen(pProcessName,"rb");
    if(!fFile)
    {
        delete [] pProcessName;
        return bReturnValue;
    }

    fseek(fFile,0,SEEK_END);

    // Get file size
    lFileSize = ftell(fFile);

    rewind(fFile);

    // Allocate memory for dummy file
    lpLocalFile = new LPVOID[lFileSize];
    ZeroMemory(lpLocalFile,lFileSize);

    // Read memory of file
    fread(lpLocalFile,lFileSize,1,fFile);

    // Close file
    fclose(fFile);

    // Grab the DOS Headers
    memcpy(&dsLocalDosHeader,lpLocalFile,sizeof(dsLocalDosHeader));

    if(dsLocalDosHeader.e_magic != IMAGE_DOS_SIGNATURE)
    {
        delete [] pProcessName;
        delete [] lpLocalFile;
        return bReturnValue;
    }

    // Grab NT Headers
    memcpy(&ntLocalNtHeader,(LPVOID)((long int)lpLocalFile+dsLocalDosHeader.e_lfanew),sizeof(dsLocalDosHeader));

    if(ntLocalNtHeader.Signature != IMAGE_NT_SIGNATURE)
    {
        delete [] pProcessName;
        delete [] lpLocalFile;
        return bReturnValue;
    }

    // Get Size and Image Base
    lLocalImageBase = ntLocalNtHeader.OptionalHeader.ImageBase;
    lLocalImageSize = ntLocalNtHeader.OptionalHeader.SizeOfImage;

    // Deallocate
    delete [] lpLocalFile;

    // Grab DOS Header for Forking Process
    memcpy(&dsDosHeader,lpImage,sizeof(dsDosHeader));

    if(dsDosHeader.e_magic != IMAGE_DOS_SIGNATURE)
    {
        delete [] pProcessName;
        return bReturnValue;
    }

    // Grab NT Header for Forking Process
    memcpy(&ntNtHeader,(LPVOID)((long int)lpImage+dsDosHeader.e_lfanew),sizeof(ntNtHeader));

    if(ntNtHeader.Signature != IMAGE_NT_SIGNATURE)
    {
        delete [] pProcessName;
        return bReturnValue;
    }

    // Get proper sizes
    lImageSize = ntNtHeader.OptionalHeader.SizeOfImage;
    lHeaderSize = ntNtHeader.OptionalHeader.SizeOfHeaders;

    // Allocate memory for image
    lpImageMemory = new LPVOID[lImageSize];
    ZeroMemory(lpImageMemory,lImageSize);

    lpImageMemoryDummy = lpImageMemory;

    lFirstSection = (long int)(((long int)lpImage+dsDosHeader.e_lfanew) + sizeof(IMAGE_NT_HEADERS));

    memcpy(shSections,(LPVOID)(lFirstSection),sizeof(IMAGE_SECTION_HEADER)*ntNtHeader.FileHeader.NumberOfSections);
    memcpy(lpImageMemoryDummy,lpImage,lHeaderSize);

    // Get Section Alignment
    if((ntNtHeader.OptionalHeader.SizeOfHeaders % ntNtHeader.OptionalHeader.SectionAlignment) == 0)
    {
        lJumpSize = ntNtHeader.OptionalHeader.SizeOfHeaders;
    }
    else
    {
        lJumpSize  = (ntNtHeader.OptionalHeader.SizeOfHeaders/ntNtHeader.OptionalHeader.SectionAlignment);
        lJumpSize += 1;
        lJumpSize *= (ntNtHeader.OptionalHeader.SectionAlignment);
    }

    lpImageMemoryDummy = (LPVOID)((long int)lpImageMemoryDummy + lJumpSize);

    // Copy Sections To Buffer
    for(lSectionCount = 0; lSectionCount < ntNtHeader.FileHeader.NumberOfSections; lSectionCount++)
    {
        lJumpSize = 0;
        lSectionSize = shSections[lSectionCount].SizeOfRawData;

        memcpy(lpImageMemoryDummy,(LPVOID)((long int)lpImage + shSections[lSectionCount].PointerToRawData),lSectionSize);

        if((shSections[lSectionCount].Misc.VirtualSize % ntNtHeader.OptionalHeader.SectionAlignment)==0)
        {
            lJumpSize = shSections[lSectionCount].Misc.VirtualSize;
        }
        else
        {
            lJumpSize  = (shSections[lSectionCount].Misc.VirtualSize/ntNtHeader.OptionalHeader.SectionAlignment);
            lJumpSize += 1;
            lJumpSize *= (ntNtHeader.OptionalHeader.SectionAlignment);
        }

        lpImageMemoryDummy = (LPVOID)((long int)lpImageMemoryDummy + lJumpSize);
    }

    ZeroMemory(&suStartUpInformation,sizeof(STARTUPINFO));
    ZeroMemory(&piProcessInformation,sizeof(PROCESS_INFORMATION));
    ZeroMemory(&cContext,sizeof(CONTEXT));

    suStartUpInformation.cb = sizeof(suStartUpInformation);

    // Create Process
    if(CreateProcess(NULL,pProcessName,NULL,NULL,false,CREATE_SUSPENDED,NULL,NULL,&suStartUpInformation,&piProcessInformation))
    {
        cContext.ContextFlags = CONTEXT_FULL;
        GetThreadContext(piProcessInformation.hThread,&cContext);

        // Check image base and image size
        if(lLocalImageBase == (long int)ntNtHeader.OptionalHeader.ImageBase && lImageSize <= lLocalImageSize)
        {
            VirtualProtectEx(piProcessInformation.hProcess,(LPVOID)((long int)ntNtHeader.OptionalHeader.ImageBase),lImageSize,PAGE_EXECUTE_READWRITE,(unsigned long*)&lPreviousProtection);
        }
        else
        {
            if(!NtUnmapViewOfSection(piProcessInformation.hProcess,(LPVOID)((DWORD)lLocalImageBase)))
                VirtualAllocEx(piProcessInformation.hProcess,(LPVOID)((long int)ntNtHeader.OptionalHeader.ImageBase),lImageSize,MEM_COMMIT | MEM_RESERVE,PAGE_EXECUTE_READWRITE);
        }

        // Write Image to Process
        if(WriteProcessMemory(piProcessInformation.hProcess,(LPVOID)((long int)ntNtHeader.OptionalHeader.ImageBase),lpImageMemory,lImageSize,(unsigned long*)&lWritten))
        {
            bReturnValue = true;
        }

        // Set Image Base
        if(WriteProcessMemory(piProcessInformation.hProcess,(LPVOID)((long int)cContext.Ebx + 8),&ntNtHeader.OptionalHeader.ImageBase,4,(unsigned long*)&lWritten))
        {
            if(bReturnValue == true)
                bReturnValue = true;
        }

        if(bReturnValue == false)
        {
            delete [] pProcessName;
            delete [] lpImageMemory;
            return bReturnValue;
        }

        // Set the new entry point
        cContext.Eax = ntNtHeader.OptionalHeader.ImageBase + ntNtHeader.OptionalHeader.AddressOfEntryPoint;

        SetThreadContext(piProcessInformation.hThread,&cContext);

        if(lLocalImageBase == (long int)ntNtHeader.OptionalHeader.ImageBase && lImageSize <= lLocalImageSize)
            VirtualProtectEx(piProcessInformation.hProcess,(LPVOID)((long int)ntNtHeader.OptionalHeader.ImageBase),lImageSize,lPreviousProtection,0);

        // Resume the process
        ResumeThread(piProcessInformation.hThread);
    }

    delete [] pProcessName;
    delete [] lpImageMemory;

    return bReturnValue;    
}

/////////////////////////////////////////////////////////////
// Fork Process From Resource
// Dynamically create a process from a resource file.
bool ForkProcessFromResource(int iResource,char* pResourceSection)
{
    HGLOBAL        hResData;
    HRSRC        hResInfo;

    LPVOID        lpRes;
    LPVOID        lpMemory;
    long int    lSize;

    HMODULE        hModule;

    bool bReturn;

    hModule = GetModuleHandle(0);
    bReturn = false;

    if(!hModule)
        return bReturn;

    hResInfo = FindResource(hModule, MAKEINTRESOURCE(iResource), pResourceSection);
    if(!hResInfo)
    {
        return bReturn;
    }

    hResData = LoadResource(hModule, hResInfo);
    if(!hResData)
    {
        return bReturn;
    }

    lpRes = LockResource(hResData);
    if(!lpRes)
    {
        FreeResource(hResData);
        return bReturn;
    }

    lSize = SizeofResource(hModule, hResInfo);

    lpMemory = new LPVOID[lSize];
    ZeroMemory(lpMemory,lSize);

    memcpy (lpMemory, lpRes, lSize);

    bReturn = ForkProcess(lpMemory);

    FreeResource(hResData);
    delete [] lpMemory;

    return bReturn;
}

helferlein

puh ganz schön viel code. warum greift der den nicht auf die datei zu?
schließlich übergibst du ihm ja einen (eigenen) dateipfad?

helferlein schrieb:

warum greift der den nicht auf die datei zu? schließlich übergibst du ihm ja einen (eigenen) dateipfad?

Grob gesagt erzeugt das Snippet "irgendeinen" Prozess und brezelt dann seine "RAM-EXE" rein.

helferlein

wird bei diesem "irgenteinem" prozess nicht aber auf die platte zurückgegriffen?

Ja, wird auch. Ist gewissermaßen "Hijacking". Insofern ist es nicht grade im Sinne des OT.

wo wird da eine exe von der HD geladen ?
oder hab ich da was nicht gesehen?

helferlein

zweiter parameter von CreateProcess....

heutemalwasanderes schrieb:

wo wird da eine exe von der HD geladen ?

Er lädt sich selbst als "dummy process" ("irgendeiner" geht auch):

if(GetModuleFileName(NULL,pProcessName,MAX_PATH) == 0) ...

(...)

// Zugriff! -> verloren,verloren,hihihi :)
if(CreateProcess(NULL,pProcessName,NULL,NULL,false,CREATE_SUSPENDED, ...

Da findet man wie man.bis win 10 rams in echtzeit lesen kann