Function at 0x403cc3
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file attributes
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x3ec
push ebx
push ebp
push esi
push edi
xor ebx, ebx
mov edi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
push 0x8001
mov dword [esp + 0x14], ebx
mov ebp, ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [esp + 0x2c]
xorps xmm0, xmm0
mov dword [esp + 0x40], ebx
push eax
movlpd qword [esp + 0x144], xmm0
mov dword [esp + 0x30], 0x11c
call esi
test eax, eax
jne 0x403d45
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x114
push eax
call esi
push 0x53
pop eax
mov dl, 4
mov byte [esp + 0x146], dl
cmp word [esp + 0x40], ax
jne 0x403d41
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x403d4c
xor eax, eax
jmp 0x403d37
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x403d5e
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403d62
mov eax, dword [esp + 0x38]
mov dword [0x46f658], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0x140]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, dl
or ecx, eax
mov eax, 0x600
mov dword [0x46f65c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x403db7
push ebx
call fcn.00407291
test eax, eax
je 0x403db7
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040688e
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x403dbc
push 0xc
call fcn.00407291
push 0xa
call fcn.00407291
push 8
mov dword [0x467550], eax
call fcn.00407291
test eax, eax
je 0x403dfd
push 0x1e
call eax
test eax, eax
je 0x403dfd
or byte [0x46f65c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x46f5c0], eax
lea eax, [esp + 0x150]
push eax
push ebx
push 0x409fb4
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x467560
call fcn.004074c5
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov esi, 0x4c0000
push esi
call fcn.004074c5
movzx ecx, word [0x4c0000]
push 0x22
pop ebx
push 0x20
pop edx
cmp cx, bx
mov dword [0x467554], 0x400000
mov eax, ebx
mov dword [esp + 0x14], ebx
cmovne eax, edx
mov edx, 0x4c0002
movzx eax, ax
push eax
mov eax, esi
cmove eax, edx
push eax
call fcn.00406e78
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov ebx, ecx
mov dword [esp + 0x18], ebx
movzx eax, word [ecx]
test ax, ax
je 0x403f78
mov esi, eax
push 0x20
pop edx
movzx eax, si
cmp si, dx
jne 0x403eb4
add ecx, 2
movzx eax, word [ecx]
cmp ax, dx
je 0x403ea9
mov ebx, edx
movzx esi, ax
movzx edx, ax
cmp ax, word [esp + 0x14]
jne 0x403ecc
movzx edx, word [ecx + 2]
push 0x22
pop eax
mov ebx, eax
cmp si, word [esp + 0x14]
lea eax, [ecx + 2]
cmovne eax, ecx
cmp dx, 0x2f
jne 0x403f36
push 0x53
add eax, 2
pop ecx
push 0x20
pop edx
cmp word [eax], cx
jne 0x403f03
movzx ecx, word [eax + 2]
cmp cx, dx
je 0x403ef9
test cx, cx
jne 0x403f03
mov dword [0x46f640], 1
cmp dword [eax], 0x43004e
jne 0x403f25
cmp dword [eax + 4], 0x430052
jne 0x403f25
movzx ecx, word [eax + 8]
cmp cx, dx
je 0x403f22
test cx, cx
jne 0x403f25
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403f36
cmp dword [eax], 0x3d0044
je 0x403f60
push ebx
push eax
call fcn.00406e78
mov ecx, eax
push 0x22
pop ebx
movzx eax, word [ecx]
mov edx, eax
cmp ax, bx
jne 0x403f52
add ecx, 2
movzx edx, word [ecx]
movzx esi, dx
test dx, dx
jne 0x403e9e
jmp 0x403f74
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x4c4000
call fcn.004074c5
mov ebx, dword [esp + 0x18]
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
push 0x4d4000
push 0x2000
call esi
call fcn.004042cd
test eax, eax
jne 0x403ffe
push 0x1ffb
push 0x4d4000
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push 0x4d4000
call sub.KERNEL32.dll_lstrcatW
call fcn.004042cd
test eax, eax
jne 0x403ffe
push 0x4d4000
push 0x1ffc
call esi
push 0x409fdc
mov esi, 0x4d4000
push esi
call sub.KERNEL32.dll_lstrcatW
push esi
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push str.TEMP
call esi
push 0x4d4000
push 0x409ff0
call esi
call fcn.004042cd
test eax, eax
je 0x4041e6
push 0x4d0000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push ebp
call fcn.0040394b
mov edi, eax
test edi, edi
jne 0x4041e6
cmp dword [0x46f564], eax
je 0x404086
xor ebp, ebp
push ebp
push 0x4c0000
call fcn.00406e78
mov esi, eax
mov eax, 0x4c0000
jmp 0x40404b
cmp dword [esi], 0x5f0020
jne 0x404048
cmp dword [esi + 4], 0x3d003f
je 0x40404f
sub esi, 2
cmp esi, eax
jae 0x404037
mov edi, str.Error_launching_installer
cmp esi, eax
jb 0x4040a0
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.00406eba
test eax, eax
je 0x404230
push esi
push 0x4c4000
call fcn.004074c5
push esi
push 0x4c8000
call fcn.004074c5
mov edi, ebp
or dword [0x46f64c], 0xffffffff
call fcn.00406112
push 1
mov ebx, eax
call fcn.00406f6a
jmp 0x4041ea
call fcn.00406be6
push 0x4d4000
mov dword [esp + 0x1c], eax
call sub.KERNEL32.dll_lstrlenW
push ebx
push section..ndata
mov esi, eax
call fcn.004074c5
cmp word [0x4c4000], bp
jne 0x4040d8
push 0x4cc000
push 0x4c4000
call fcn.004074c5
xor ebx, ebx
lea eax, [esi*2 + 0x4d4000]
inc ebx
mov dword [esp + 0x14], eax
mov esi, ebp
movzx ebp, bx
push ebp
push str.nsu_X.tmp
push eax
call dword [sym.imp.USER32.dll_wsprintfW]
mov eax, dword [0x46f570]
add esp, 0xc
push dword [eax + 0x120]
push 0x484000
call fcn.00406598
cmp dword [esp + 0x18], 0
push 0x4d4000
je 0x404123
call fcn.0040653d
jmp 0x404128
call fcn.0040651d
test eax, eax
je 0x404175
push 0x484000
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test eax, 0x400
jne 0x40420e
push 0x484000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x40420e
push 1
push 0x4d4000
call fcn.0040706a
mov eax, esi
inc esi
test eax, eax
jne 0x40420e
mov eax, dword [esp + 0x14]
jmp 0x4040eb
push 0x4d4000
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push 0x4d4000
call fcn.00406927
push 1
push 0x484000
push 0x4dc000
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x4041e6
push 0
push 0x484000
call fcn.00406927
mov eax, dword [0x46f570]
push dword [eax + 0x124]
push 0x488000
call fcn.00406598
push 0x488000
call fcn.00407027
test eax, eax
jne 0x404221
mov eax, esi
inc esi
test eax, eax
jne 0x4041e6
push 0x484000
call fcn.00406e51
test eax, eax
je 0x40416c
mov ebx, dword [esp + 0x10]
xor ebp, ebp
call fcn.00403c81
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x404234
push 0x200010
push edi
call fcn.00407453
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov eax, dword [esp + 0x14]
inc ebx
push 0
pop ebp
test bx, bx
jne 0x4040e6
jmp 0x4041e6
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor ebp, ebp
mov edi, ebp
mov ebx, edi
jmp 0x4041ec
mov ebx, ebp
jmp 0x4041ea
cmp dword [0x46f634], 0
je 0x4042b9
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x404289
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebp
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebp
push ebp
push ebp
lea eax, [esp + 0x28]
mov dword [esp + 0x28], 1
push eax
push ebp
push dword [esp + 0x2c]
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00407291
mov esi, 0x80040002
test eax, eax
je 0x4042a5
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x4042b2
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4042b9
push 9
call fcn.0040153b
cmp dword [0x46f64c], 0xffffffff
cmovne ebx, dword [0x46f64c]
push ebx
jmp 0x404208