Function at 0x4031a3
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 0x4031eb
push ebx
call fcn.0040615c
cmp eax, ebx
je 0x4031eb
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004060ee
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4031f0
push ebp
push 9
call fcn.0040615c
push 7
call fcn.0040615c
mov dword [0x452404], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4524b8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x434028
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x44e400
call fcn.00405dc3
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x47b000
push eax
push ebp
call fcn.00405dc3
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x47b000], 0x22
mov dword [0x452400], eax
mov eax, ebp
jne 0x403284
mov byte [esp + 0x14], 0x22
mov eax, 0x47b001
push dword [esp + 0x14]
push eax
call fcn.00405860
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x40335e
cmp cl, 0x20
jne 0x4032a9
inc eax
cmp byte [eax], 0x20
je 0x4032a3
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4032b9
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40334e
inc eax
cmp byte [eax], 0x53
jne 0x4032de
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4032d4
cmp cl, bl
jne 0x4032de
mov dword [0x4524a0], 1
movsx ecx, byte [0x40a183]
movsx edx, byte [0x40a182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x40331e
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403319
cmp cl, bl
jne 0x40331e
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a17b]
movsx edx, byte [0x40a17a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x40336a
push dword [esp + 0x14]
push eax
call fcn.00405860
cmp byte [eax], 0x22
jne 0x40335e
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x40329e
jmp 0x40337b
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x47d000
call fcn.00405dc3
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x485000
push esi
push 0x2000
call edi
call fcn.00403172
test eax, eax
jne 0x4033ed
push 0x1ffb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403172
test eax, eax
jne 0x4033ed
push esi
push 0x1ffc
call edi
push 0x40a16c
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 0x40a160
call edi
call fcn.00403172
test eax, eax
je 0x40349b
push 0x483000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402cfa
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x40349b
cmp dword [0x45241c], ebx
je 0x40348b
push ebx
push ebp
call fcn.00405860
mov edi, eax
cmp edi, ebp
jb 0x403456
movsx eax, byte [0x40a15b]
movsx ecx, byte [0x40a15a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a159]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a158]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403456
dec edi
cmp edi, ebp
jae 0x40344d
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x4034c7
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405923
test eax, eax
je 0x40349b
push edi
push 0x47d000
call fcn.00405dc3
push edi
push 0x47f000
call fcn.00405dc3
mov dword [esp + 0x10], ebx
or dword [0x4524ac], 0xffffffff
call fcn.00403743
mov dword [esp + 0x18], eax
call fcn.00403669
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x4035cf
push 0x200010
push dword [esp + 0x10]
call fcn.004055b9
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.0040553c
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x4034e8
push 0x40a14c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x481000
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x40349b
cmp edi, ebx
push esi
je 0x403510
call fcn.004054a2
jmp 0x403515
call fcn.0040551f
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x47d000], bl
jne 0x40352f
push ebp
push 0x47d000
call fcn.00405dc3
push dword [esp + 0x1c]
push section..ndata
call fcn.00405dc3
movsx cx, byte [0x40a140]
xor eax, eax
push 0x1a
mov ah, byte [0x40a141]
pop ebp
or eax, ecx
mov edi, 0x432028
mov word [0x455000], ax
mov eax, dword [0x452410]
push dword [eax + 0x120]
push edi
call fcn.00405de5
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4035ba
push 1
push edi
push 0x489000
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4035ba
push ebx
push edi
call fcn.00405c7e
mov eax, dword [0x452410]
push dword [eax + 0x124]
push edi
call fcn.00405de5
push edi
call fcn.00405554
cmp eax, ebx
je 0x4035ba
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x455000]
dec ebp
jne 0x40355d
push ebx
push esi
call fcn.00405c7e
jmp 0x40349b
cmp dword [0x452494], ebx
je 0x403651
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 0x403622
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.0040615c
cmp eax, ebx
mov esi, 0x80040002
je 0x40363e
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x40364a
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403651
push 9
call fcn.0040140b
mov eax, dword [0x4524ac]
cmp eax, 0xffffffff
je 0x40365f
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]