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POC++ add PE file as resource and execute it from memory
 

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  1. POC++ add PE file as resource and execute it from memory
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    <p>I have the following program in C++ that adds an EXE file (PE) as resource and executes it from memory (no, is not malware related, I just use for a personal project a GPL exe file, so no license violation) but seems the PE file is not loaded as resource when I compile it from commandline as <code>cl /EHsc embed.cpp</code>. The full sourcecode is as follows:</p> <p>embed.cpp</p> <pre><code>#include &lt;windows.h&gt; #include &lt;iostream&gt; #include "resource.h" SECURITY_ATTRIBUTES secAttrib; using namespace std; void RunFromMemory(char*, char*); int main(int argc, char* argv[]) { HGLOBAL hResData; HRSRC hResInfo; void *pvRes; DWORD dwSize; char* lpMemory; HMODULE hModule = GetModuleHandle(NULL); if (((hResInfo = FindResource(hModule, MAKEINTRESOURCE(IDD_EXE1), RT_RCDATA)) != NULL) &amp;&amp; ((hResData = LoadResource(hModule, hResInfo)) != NULL) &amp;&amp; ((pvRes = LockResource(hResData)) != NULL)) { dwSize = SizeofResource(hModule, hResInfo); lpMemory = (char*)malloc (dwSize); memset(lpMemory,0,dwSize); memcpy (lpMemory, pvRes, dwSize); RunFromMemory(lpMemory,argv[0]); } } void RunFromMemory(char* pImage,char* pPath) { DWORD dwWritten = 0; DWORD dwHeader = 0; DWORD dwImageSize = 0; DWORD dwSectionCount = 0; DWORD dwSectionSize = 0; DWORD firstSection = 0; DWORD previousProtection = 0; DWORD jmpSize = 0; IMAGE_NT_HEADERS INH; IMAGE_DOS_HEADER IDH; IMAGE_SECTION_HEADER Sections[1000]; PROCESS_INFORMATION peProcessInformation; STARTUPINFO peStartUpInformation; CONTEXT pContext; char* pMemory; char* pFile; memcpy(&amp;IDH,pImage,sizeof(IDH)); memcpy(&amp;INH,(void*)((DWORD)pImage+IDH.e_lfanew),sizeof(INH)); dwImageSize = INH.OptionalHeader.SizeOfImage; pMemory = (char*)malloc(dwImageSize); memset(pMemory,0,dwImageSize); pFile = pMemory; dwHeader = INH.OptionalHeader.SizeOfHeaders; firstSection = (DWORD)(((DWORD)pImage+IDH.e_lfanew) + sizeof(IMAGE_NT_HEADERS)); memcpy(Sections,(char*)(firstSection),sizeof(IMAGE_SECTION_HEADER)*INH.FileHeader.NumberOfSections); memcpy(pFile,pImage,dwHeader); if((INH.OptionalHeader.SizeOfHeaders % INH.OptionalHeader.SectionAlignment)==0) { jmpSize = INH.OptionalHeader.SizeOfHeaders; } else { jmpSize = INH.OptionalHeader.SizeOfHeaders / INH.OptionalHeader.SectionAlignment; jmpSize += 1; jmpSize *= INH.OptionalHeader.SectionAlignment; } pFile = (char*)((DWORD)pFile + jmpSize); for(dwSectionCount = 0; dwSectionCount &lt; INH.FileHeader.NumberOfSections; dwSectionCount++) { jmpSize = 0; dwSectionSize = Sections[dwSectionCount].SizeOfRawData; memcpy(pFile,(char*)(pImage + Sections[dwSectionCount].PointerToRawData),dwSectionSize); if((Sections[dwSectionCount].Misc.VirtualSize % INH.OptionalHeader.SectionAlignment)==0) { jmpSize = Sections[dwSectionCount].Misc.VirtualSize; } else { jmpSize = Sections[dwSectionCount].Misc.VirtualSize / INH.OptionalHeader.SectionAlignment; jmpSize += 1; jmpSize *= INH.OptionalHeader.SectionAlignment; } pFile = (char*)((DWORD)pFile + jmpSize); } memset(&amp;peStartUpInformation,0,sizeof(STARTUPINFO)); memset(&amp;peProcessInformation,0,sizeof(PROCESS_INFORMATION)); memset(&amp;pContext,0,sizeof(CONTEXT)); peStartUpInformation.cb = sizeof(peStartUpInformation); if(CreateProcess(NULL,pPath,&amp;secAttrib,NULL,false,CREATE_SUSPENDED,NULL,NULL,&amp;peStartUpInformation,&amp;peProcessInformation)) { pContext.ContextFlags = CONTEXT_FULL; GetThreadContext(peProcessInformation.hThread,&amp;pContext); VirtualProtectEx(peProcessInformation.hProcess,(void*)((DWORD)INH.OptionalHeader.ImageBase),dwImageSize,PAGE_EXECUTE_READWRITE,&amp;previousProtection); WriteProcessMemory(peProcessInformation.hProcess,(void*)((DWORD)INH.OptionalHeader.ImageBase),pMemory,dwImageSize,&amp;dwWritten); WriteProcessMemory(peProcessInformation.hProcess,(void*)((DWORD)pContext.Ebx + 8),&amp;INH.OptionalHeader.ImageBase,4,&amp;dwWritten); pContext.Eax = INH.OptionalHeader.ImageBase + INH.OptionalHeader.AddressOfEntryPoint; SetThreadContext(peProcessInformation.hThread,&amp;pContext); VirtualProtectEx(peProcessInformation.hProcess,(void*)((DWORD)INH.OptionalHeader.ImageBase),dwImageSize,previousProtection,0); ResumeThread(peProcessInformation.hThread); } free(pMemory); } </code></pre> <p>app.rc</p> <pre><code>IDD_EXE1 RCDATA "mm.txt" </code></pre> <p>resource.h</p> <pre><code>#define IDD_EXE1 1004 </code></pre> <p>the <code>mm.txt</code> is my EXE file.</p> <p>It compiles ok but I can't see the EXE added as resource. Any thoughts where I could be wrong?</p> <p>EDIT:</p> <p>As per Zevin Zenph Zambori's answer, "loaded" the exe as HEX and not resource, all works ok, the only problem my compiled console applications hangs at the end waiting for user input (carriage-return or smth...) any idea why doesn't terminate? Here is the code:</p> <pre><code>// compile under VC with: cl /EHsc embed.cpp #include &lt;windows.h&gt; #include &lt;iostream&gt; SECURITY_ATTRIBUTES secAttrib; using namespace std; void RunFromMemory(char*, char*); char _image_[] = { 0x4D,0x5A, .... ,0x00,0x00 }; int main(int argc, char* argv[]) { char current_file_path[1024]; GetModuleFileNameA(0, current_file_path, 1024); // Path to current executable. RunFromMemory(_image_, current_file_path); return 0; } void RunFromMemory(char* pImage,char* pPath) { DWORD dwWritten = 0; DWORD dwHeader = 0; DWORD dwImageSize = 0; DWORD dwSectionCount = 0; DWORD dwSectionSize = 0; DWORD firstSection = 0; DWORD previousProtection = 0; DWORD jmpSize = 0; IMAGE_NT_HEADERS INH; IMAGE_DOS_HEADER IDH; IMAGE_SECTION_HEADER Sections[1000]; PROCESS_INFORMATION peProcessInformation; STARTUPINFO peStartUpInformation; CONTEXT pContext; char* pMemory; char* pFile; memcpy(&amp;IDH,pImage,sizeof(IDH)); memcpy(&amp;INH,(void*)((DWORD)pImage+IDH.e_lfanew),sizeof(INH)); dwImageSize = INH.OptionalHeader.SizeOfImage; pMemory = (char*)malloc(dwImageSize); memset(pMemory,0,dwImageSize); pFile = pMemory; dwHeader = INH.OptionalHeader.SizeOfHeaders; firstSection = (DWORD)(((DWORD)pImage+IDH.e_lfanew) + sizeof(IMAGE_NT_HEADERS)); memcpy(Sections,(char*)(firstSection),sizeof(IMAGE_SECTION_HEADER)*INH.FileHeader.NumberOfSections); memcpy(pFile,pImage,dwHeader); if((INH.OptionalHeader.SizeOfHeaders % INH.OptionalHeader.SectionAlignment)==0) { jmpSize = INH.OptionalHeader.SizeOfHeaders; } else { jmpSize = INH.OptionalHeader.SizeOfHeaders / INH.OptionalHeader.SectionAlignment; jmpSize += 1; jmpSize *= INH.OptionalHeader.SectionAlignment; } pFile = (char*)((DWORD)pFile + jmpSize); for(dwSectionCount = 0; dwSectionCount &lt; INH.FileHeader.NumberOfSections; dwSectionCount++) { jmpSize = 0; dwSectionSize = Sections[dwSectionCount].SizeOfRawData; memcpy(pFile,(char*)(pImage + Sections[dwSectionCount].PointerToRawData),dwSectionSize); if((Sections[dwSectionCount].Misc.VirtualSize % INH.OptionalHeader.SectionAlignment)==0) { jmpSize = Sections[dwSectionCount].Misc.VirtualSize; } else { jmpSize = Sections[dwSectionCount].Misc.VirtualSize / INH.OptionalHeader.SectionAlignment; jmpSize += 1; jmpSize *= INH.OptionalHeader.SectionAlignment; } pFile = (char*)((DWORD)pFile + jmpSize); } memset(&amp;peStartUpInformation,0,sizeof(STARTUPINFO)); memset(&amp;peProcessInformation,0,sizeof(PROCESS_INFORMATION)); memset(&amp;pContext,0,sizeof(CONTEXT)); peStartUpInformation.cb = sizeof(peStartUpInformation); if(CreateProcess(NULL,pPath,&amp;secAttrib,NULL,false,CREATE_SUSPENDED,NULL,NULL,&amp;peStartUpInformation,&amp;peProcessInformation)) { pContext.ContextFlags = CONTEXT_FULL; GetThreadContext(peProcessInformation.hThread,&amp;pContext); VirtualProtectEx(peProcessInformation.hProcess,(void*)((DWORD)INH.OptionalHeader.ImageBase),dwImageSize,PAGE_EXECUTE_READWRITE,&amp;previousProtection); WriteProcessMemory(peProcessInformation.hProcess,(void*)((DWORD)INH.OptionalHeader.ImageBase),pMemory,dwImageSize,&amp;dwWritten); WriteProcessMemory(peProcessInformation.hProcess,(void*)((DWORD)pContext.Ebx + 8),&amp;INH.OptionalHeader.ImageBase,4,&amp;dwWritten); pContext.Eax = INH.OptionalHeader.ImageBase + INH.OptionalHeader.AddressOfEntryPoint; SetThreadContext(peProcessInformation.hThread,&amp;pContext); VirtualProtectEx(peProcessInformation.hProcess,(void*)((DWORD)INH.OptionalHeader.ImageBase),dwImageSize,previousProtection,0); ResumeThread(peProcessInformation.hThread); } free(pMemory); } </code></pre>
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    1. COSo what you want to make is basically your own version of the program loader? Remember that you have to properly handle all segments in the PE file, as well as relocation, and also remember to mark the memory where you put the actual code as executable (which I doubt can be done from a normal user-space program).
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      1. USSome programmer dude
    2. COSo I got it all wrong with the code?
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    3. CO@joachimpileborg you can mark a block of memory as executable from user-space using ´VirtualProtect´.
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      1. USIridium
 

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