Function at 0x403eda
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, 0x218
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_GetVersionExA]
lea eax, [esp + 0x2c]
xorps xmm0, xmm0
mov dword [esp + 0x40], ebx
push eax
movlpd qword [esp + 0xc4], xmm0
mov dword [esp + 0x30], 0x9c
call esi
test eax, eax
jne 0x403f64
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x94
push eax
call esi
mov eax, dword [esp + 0x3c]
cmp eax, 2
jne 0x403f6b
cmp byte [esp + 0x40], 0x53
mov byte [esp + 0xc6], 4
jne 0x403f58
movsx ax, byte [esp + 0x4d]
sub ax, 0x30
jmp 0x403f86
xor ecx, ecx
mov word [esp + 0xc0], cx
jmp 0x403f68
mov eax, dword [esp + 0x3c]
cmp eax, 2
jae 0x403f8e
mov al, byte [esp + 0x41]
mov byte [esp + 0xc6], bl
cmp al, 0x41
jl 0x403f84
cbw
sub ax, 0x40
jmp 0x403f86
xor eax, eax
mov word [esp + 0xc0], ax
cmp dword [esp + 0x30], 0xa
jae 0x403fa0
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403fa4
mov eax, dword [esp + 0x38]
mov dword [0x447118], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0xc0]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, byte [esp + 0xc6]
or ecx, eax
mov eax, 0x600
mov dword [0x44711c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x403ffe
push ebx
call fcn.0040733b
test eax, eax
je 0x403ffe
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004069e9
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x404003
push 0xc
call fcn.0040733b
push 0xa
call fcn.0040733b
push 8
mov dword [0x443010], eax
call fcn.0040733b
test eax, eax
je 0x404044
push 0x1e
call eax
test eax, eax
je 0x404044
or byte [0x44711c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x160
mov dword [0x447080], eax
lea eax, [esp + 0xd0]
push eax
push ebx
push 0x409b13
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x443020
call fcn.00407560
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov ebx, 0x470000
push ebx
call fcn.00407560
cmp byte [0x470000], 0x22
mov edx, 0x470001
mov dword [0x443014], 0x400000
sete al
lea eax, [eax*2 + 0x20]
push eax
mov eax, ebx
cmove eax, edx
push eax
call fcn.00406f1b
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov ecx, eax
mov ebx, ecx
mov dword [esp + 0x18], ebx
mov dl, byte [ecx]
test dl, dl
je 0x40416c
jmp 0x4040db
inc ecx
mov dl, byte [ecx]
cmp dl, 0x20
je 0x4040d8
mov byte [esp + 0x14], 0x20
mov bl, dl
cmp dl, 0x22
jne 0x4040f3
mov bl, byte [ecx + 1]
mov byte [esp + 0x14], dl
lea eax, [ecx + 1]
cmovne eax, ecx
cmp bl, 0x2f
jne 0x40413a
inc eax
cmp byte [eax], 0x53
jne 0x40411a
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x404110
test cl, cl
jne 0x40411a
mov dword [0x447100], 1
cmp dword [eax], 0x4352434e
jne 0x404131
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40412e
test cl, cl
jne 0x404131
or ebp, 4
cmp dword [eax - 2], 0x3d442f20
je 0x404156
push dword [esp + 0x14]
push eax
call fcn.00406f1b
mov ecx, eax
mov dl, byte [ecx]
cmp dl, 0x22
jne 0x404150
inc ecx
mov dl, byte [ecx]
test dl, dl
jne 0x4040db
jmp 0x404168
mov byte [eax - 2], 0
add eax, 2
push eax
push 0x472000
call fcn.00407560
mov ebx, dword [esp + 0x18]
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
push 0x47a000
push 0x2000
call esi
call fcn.004044ab
test eax, eax
jne 0x4041f2
push 0x1ffb
push 0x47a000
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push 0x47a000
call sub.KERNEL32.dll_lstrcatA
call fcn.004044ab
test eax, eax
jne 0x4041f2
push 0x47a000
push 0x1ffc
call esi
push 0x409b28
mov esi, 0x47a000
push esi
call sub.KERNEL32.dll_lstrcatA
push esi
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push str.TEMP
call esi
push 0x47a000
push 0x409b34
call esi
call fcn.004044ab
test eax, eax
je 0x4043c6
push 0x478000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push ebp
call fcn.00403a5c
mov edi, eax
test edi, edi
jne 0x4043c6
cmp dword [0x44702c], eax
je 0x404267
push eax
mov ebp, 0x470000
push ebp
call fcn.00406f1b
mov esi, eax
jmp 0x40422e
cmp dword [esi], 0x3d3f5f20
je 0x404232
dec esi
cmp esi, ebp
jae 0x404225
mov edi, str.Error_launching_installer
cmp esi, ebp
jb 0x404281
mov byte [esi], 0
add esi, 4
push esi
call fcn.00406f58
test eax, eax
je 0x4043c6
push esi
push 0x472000
call fcn.00407560
push esi
push 0x474000
call fcn.00407560
xor edi, edi
or dword [0x44710c], 0xffffffff
call fcn.00406234
push 1
mov ebx, eax
call fcn.00407001
jmp 0x4043ca
call fcn.00406c8b
push 0x47a000
mov dword [esp + 0x1c], eax
call sub.KERNEL32.dll_lstrlenA
push ebx
push section..ndata
mov esi, eax
call fcn.00407560
cmp byte [0x472000], 0
jne 0x4042b9
push 0x476000
push 0x472000
call fcn.00407560
xor ebx, ebx
lea eax, [esi + 0x47a000]
inc ebx
mov dword [esp + 0x14], eax
xor esi, esi
movzx ebp, bx
push ebp
push str.nsu_X.tmp
push eax
call dword [sym.imp.USER32.dll_wsprintfA]
mov eax, dword [0x447038]
add esp, 0xc
push dword [eax + 0x120]
push 0x452000
call fcn.004066e3
cmp dword [esp + 0x18], 0
push 0x47a000
je 0x404303
call fcn.00406688
jmp 0x404308
call fcn.00406668
test eax, eax
je 0x404355
push 0x452000
call dword [sym.imp.KERNEL32.dll_GetFileAttributesA]
test eax, 0x400
jne 0x4043ec
push 0x452000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
test eax, eax
je 0x4043ec
push 1
push 0x47a000
call fcn.004070fd
mov eax, esi
inc esi
test eax, eax
jne 0x4043ec
mov eax, dword [esp + 0x14]
jmp 0x4042cb
push 0x47a000
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
push 0
push 0x47a000
call fcn.00406a84
push 1
push 0x452000
push 0x47e000
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4043c6
push 0
push 0x452000
call fcn.00406a84
mov eax, dword [0x447038]
push dword [eax + 0x124]
push 0x454000
call fcn.004066e3
push 0x454000
call fcn.004070ba
test eax, eax
jne 0x4043fc
mov eax, esi
inc esi
test eax, eax
jne 0x4043c6
push 0x452000
call fcn.00406ef4
test eax, eax
je 0x40434c
mov ebx, dword [esp + 0x10]
call fcn.00403eb0
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x404409
push 0x200010
push edi
call fcn.004074ee
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov eax, dword [esp + 0x14]
inc ebx
test bx, bx
jne 0x4042c6
jmp 0x4043c6
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor edi, edi
mov ebx, edi
jmp 0x4043ca
cmp dword [0x4470f4], 0
je 0x404497
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 0x404465
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push 0
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
xor ecx, ecx
mov dword [esp + 0x1c], 1
push ecx
push ecx
push ecx
lea eax, [esp + 0x28]
mov dword [esp + 0x34], 2
push eax
push ecx
push dword [esp + 0x2c]
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.0040733b
mov esi, 0x80040002
test eax, eax
je 0x404483
push esi
push 0x25
xor ecx, ecx
push ecx
push ecx
push ecx
call eax
test eax, eax
je 0x404490
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x404497
push 9
call fcn.0040153c
cmp dword [0x44710c], 0xffffffff
cmovne ebx, dword [0x44710c]
push ebx
jmp 0x4043e6