Function at 0x403888
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 0x40390a
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 0x403906
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x403911
xor eax, eax
jmp 0x4038fc
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x403923
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403927
mov eax, dword [esp + 0x38]
mov dword [0x7a7e78], 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 [0x7a7e7c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x40397c
push ebx
call fcn.00406abd
test eax, eax
je 0x40397c
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406375
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x403981
push 0xc
call fcn.00406abd
push 0xa
call fcn.00406abd
push 8
mov dword [0x7a6d70], eax
call fcn.00406abd
test eax, eax
je 0x4039c2
push 0x1e
call eax
test eax, eax
je 0x4039c2
or byte [0x7a7e7c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x7a7de0], eax
lea eax, [esp + 0x150]
push eax
push ebx
push 0x4085cc
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x7a6d80
call fcn.00406cf1
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov esi, 0x7b2000
push esi
call fcn.00406cf1
movzx ecx, word [0x7b2000]
push 0x22
pop ebx
push 0x20
pop edx
cmp cx, bx
mov dword [0x7a6d74], 0x400000
mov eax, ebx
mov dword [esp + 0x14], ebx
cmovne eax, edx
mov edx, 0x7b2002
movzx eax, ax
push eax
mov eax, esi
cmove eax, edx
push eax
call fcn.004067cd
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 0x403b3d
mov esi, eax
push 0x20
pop edx
movzx eax, si
cmp si, dx
jne 0x403a79
add ecx, 2
movzx eax, word [ecx]
cmp ax, dx
je 0x403a6e
mov ebx, edx
movzx esi, ax
movzx edx, ax
cmp ax, word [esp + 0x14]
jne 0x403a91
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 0x403afb
push 0x53
add eax, 2
pop ecx
push 0x20
pop edx
cmp word [eax], cx
jne 0x403ac8
movzx ecx, word [eax + 2]
cmp cx, dx
je 0x403abe
test cx, cx
jne 0x403ac8
mov dword [0x7a7e60], 1
cmp dword [eax], 0x43004e
jne 0x403aea
cmp dword [eax + 4], 0x430052
jne 0x403aea
movzx ecx, word [eax + 8]
cmp cx, dx
je 0x403ae7
test cx, cx
jne 0x403aea
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403afb
cmp dword [eax], 0x3d0044
je 0x403b25
push ebx
push eax
call fcn.004067cd
mov ecx, eax
push 0x22
pop ebx
movzx eax, word [ecx]
mov edx, eax
cmp ax, bx
jne 0x403b17
add ecx, 2
movzx edx, word [ecx]
movzx esi, dx
test dx, dx
jne 0x403a63
jmp 0x403b39
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x7b2800
call fcn.00406cf1
mov ebx, dword [esp + 0x18]
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
push 0x7b4800
push 0x400
call esi
call fcn.00403e8b
test eax, eax
jne 0x403bc3
push 0x3fb
push 0x7b4800
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push 0x7b4800
call sub.KERNEL32.dll_lstrcatW
call fcn.00403e8b
test eax, eax
jne 0x403bc3
push 0x7b4800
push 0x3fc
call esi
push 0x4085f4
mov esi, 0x7b4800
push esi
call sub.KERNEL32.dll_lstrcatW
push esi
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push str.TEMP
call esi
push 0x7b4800
push 0x408608
call esi
call fcn.00403e8b
test eax, eax
je 0x403da4
push 0x7b4000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push ebp
call fcn.0040350f
mov edi, eax
test edi, edi
jne 0x403da4
cmp dword [0x7a7d84], eax
je 0x403c4b
xor ebp, ebp
push ebp
push 0x7b2000
call fcn.004067cd
mov esi, eax
mov eax, 0x7b2000
jmp 0x403c10
cmp dword [esi], 0x5f0020
jne 0x403c0d
cmp dword [esi + 4], 0x3d003f
je 0x403c14
sub esi, 2
cmp esi, eax
jae 0x403bfc
mov edi, str.Error_launching_installer
cmp esi, eax
jb 0x403c5e
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.0040680f
test eax, eax
je 0x403dee
push esi
push 0x7b2800
call fcn.00406cf1
push esi
push 0x7b3000
call fcn.00406cf1
mov edi, ebp
or dword [0x7a7e6c], 0xffffffff
call fcn.00405c24
mov ebx, eax
jmp 0x403da8
call fcn.004066d3
push 0x7b4800
mov dword [esp + 0x1c], eax
call sub.KERNEL32.dll_lstrlenW
push ebx
push section..ndata
mov esi, eax
call fcn.00406cf1
cmp word [0x7b2800], bp
jne 0x403c96
push 0x7b3800
push 0x7b2800
call fcn.00406cf1
xor ebx, ebx
lea eax, [esi*2 + 0x7b4800]
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 [0x7a7d90]
add esp, 0xc
push dword [eax + 0x120]
push 0x7aa800
call fcn.0040607f
cmp dword [esp + 0x18], 0
push 0x7b4800
je 0x403ce1
call fcn.00406024
jmp 0x403ce6
call fcn.00406004
test eax, eax
je 0x403d33
push 0x7aa800
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test eax, 0x400
jne 0x403dcc
push 0x7aa800
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x403dcc
push 1
push 0x7b4800
call fcn.004068f0
mov eax, esi
inc esi
test eax, eax
jne 0x403dcc
mov eax, dword [esp + 0x14]
jmp 0x403ca9
push 0x7b4800
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push 0x7b4800
call fcn.00406414
push 1
push 0x7aa800
push 0x7b5800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403da4
push 0
push 0x7aa800
call fcn.00406414
mov eax, dword [0x7a7d90]
push dword [eax + 0x124]
push 0x7ab000
call fcn.0040607f
push 0x7ab000
call fcn.004068ad
test eax, eax
jne 0x403ddf
mov eax, esi
inc esi
test eax, eax
jne 0x403da4
push 0x7aa800
call fcn.004067a6
test eax, eax
je 0x403d2a
mov ebx, dword [esp + 0x10]
xor ebp, ebp
call fcn.00403846
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x403df2
push 0x200010
push edi
call fcn.00406c7f
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov eax, dword [esp + 0x14]
inc ebx
push 0
pop ebp
test bx, bx
jne 0x403ca4
jmp 0x403da4
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor ebp, ebp
mov edi, ebp
mov ebx, edi
jmp 0x403daa
mov ebx, ebp
jmp 0x403da8
cmp dword [0x7a7e54], 0
je 0x403e77
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 0x403e47
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.00406abd
mov esi, 0x80040002
test eax, eax
je 0x403e63
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x403e70
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403e77
push 9
call fcn.00401533
cmp dword [0x7a7e6c], 0xffffffff
cmovne ebx, dword [0x7a7e6c]
push ebx
jmp 0x403dc6