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; Author: Stephen Fewer (stephen_fewer[at]harmonysecurity[dot]com)
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; Architecture: x64
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;
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; Assemble and link with the following command:
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; "C:\Program Files\Microsoft Visual Studio 9.0\VC\bin\x86_amd64\ml64" template_x64_windows.asm /link /subsystem:windows /defaultlib:"C:\Program Files\Microsoft SDKs\Windows\v6.0A\Lib\x64\kernel32.lib" /entry:main 
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extrn ExitProcess : proc
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extrn VirtualAlloc : proc
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.code
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	main proc 
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		sub rsp, 40        ;
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		mov r9, 40h        ; 
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		mov r8, 3000h      ; 
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		mov rdx, 4096      ; 
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		xor rcx, rcx       ; 
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		call VirtualAlloc  ; lpPayload = VirtualAlloc( NULL, 4096, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE );
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		mov rcx, 4096      ;
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		mov rsi, payload   ;
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		mov rdi, rax       ;
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		rep movsb          ; memcpy( lpPayload, payload, 4096 );
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		call rax           ; lpPayload();
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		xor rcx, rcx       ;
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		call ExitProcess   ; ExitProcess( 0 );
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	main endp
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	payload proc
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		A byte 'PAYLOAD:'
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		B db 4096-8 dup ( 0 )
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	payload endp
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end
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