Function at 0x403609
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x184
push ebx
push esi
push edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x18], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x20], ebx
mov byte [esp + 0x14], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
cmp ax, 6
je 0x403651
push ebx
call fcn.00406893
cmp eax, ebx
je 0x403651
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406825
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403656
push ebp
push 9
call fcn.00406893
push 7
call fcn.00406893
mov dword [0x430884], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x430938], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x42a0a8
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x430080
call fcn.00406356
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x436000
push eax
push ebp
call fcn.00406356
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x436000], 0x22
mov dword [0x430880], eax
mov eax, ebp
jne 0x4036ea
mov byte [esp + 0x14], 0x22
mov eax, 0x436001
push dword [esp + 0x14]
push eax
call fcn.00405df3
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4037c4
cmp cl, 0x20
jne 0x40370f
inc eax
cmp byte [eax], 0x20
je 0x403709
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x40371f
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4037b4
inc eax
cmp byte [eax], 0x53
jne 0x403744
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x40373a
cmp cl, bl
jne 0x403744
mov dword [0x430920], 1
movsx ecx, byte [0x40a803]
movsx edx, byte [0x40a802]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a801]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403784
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40377f
cmp cl, bl
jne 0x403784
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a7fb]
movsx edx, byte [0x40a7fa]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a7f9]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4037d0
push dword [esp + 0x14]
push eax
call fcn.00405df3
cmp byte [eax], 0x22
jne 0x4037c4
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403704
jmp 0x4037e1
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x436400
call fcn.00406356
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x437400
push esi
push 0x400
call edi
call fcn.004035d8
test eax, eax
jne 0x403853
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004035d8
test eax, eax
jne 0x403853
push esi
push 0x3fc
call edi
push 0x40a7ec
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push esi
push str.TEMP
call edi
push esi
push 0x40a7e0
call edi
call fcn.004035d8
test eax, eax
je 0x403908
push 0x437000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00403160
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403908
cmp dword [0x43089c], ebx
je 0x4038f1
push ebx
push ebp
call fcn.00405df3
mov edi, eax
cmp edi, ebp
jb 0x4038bc
movsx eax, byte [0x40a7db]
movsx ecx, byte [0x40a7da]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a7d9]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a7d8]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x4038bc
dec edi
cmp edi, ebp
jae 0x4038b3
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403934
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405eb6
test eax, eax
je 0x403908
push edi
push 0x436400
call fcn.00406356
push edi
push 0x436800
call fcn.00406356
mov dword [esp + 0x10], ebx
or dword [0x43092c], 0xffffffff
call fcn.00403bd1
push 1
mov dword [esp + 0x1c], eax
call fcn.0040665a
call fcn.00403ad6
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403a3c
push 0x200010
push dword [esp + 0x10]
call fcn.00405af7
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405a7a
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403955
push 0x40a7cc
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x436c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403908
cmp edi, ebx
push esi
je 0x40397d
call fcn.004059e0
jmp 0x403982
call fcn.00405a5d
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x436400], bl
jne 0x40399c
push ebp
push 0x436400
call fcn.00406356
push dword [esp + 0x1c]
push section..ndata
call fcn.00406356
movsx cx, byte [0x40a7c0]
xor eax, eax
push 0x1a
mov ah, byte [0x40a7c1]
pop ebp
or eax, ecx
mov edi, 0x429ca8
mov word [0x431400], ax
mov eax, dword [0x430890]
push dword [eax + 0x120]
push edi
call fcn.00406378
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403a27
push 1
push edi
push 0x437c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403a27
push ebx
push edi
call fcn.00406211
mov eax, dword [0x430890]
push dword [eax + 0x124]
push edi
call fcn.00406378
push edi
call fcn.00405a92
cmp eax, ebx
je 0x403a27
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x431400]
dec ebp
jne 0x4039ca
push ebx
push esi
call fcn.00406211
jmp 0x403908
cmp dword [0x430914], ebx
je 0x403abe
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
push 2
test eax, eax
pop edi
je 0x403a8f
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
push eax
push ebx
push dword [esp + 0x2c]
mov dword [esp + 0x38], 1
mov dword [esp + 0x44], edi
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406893
cmp eax, ebx
mov esi, 0x80040002
je 0x403aab
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403ab7
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403abe
push 9
call fcn.0040140b
mov eax, dword [0x43092c]
cmp eax, 0xffffffff
je 0x403acc
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]