Function at 0x403990
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, 0x2d4
push ebx
push esi
push edi
push 0x20
pop edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x14], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x1c], ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
cmp ax, 6
mov dword [0x42cbec], eax
je 0x4039e0
push ebx
call fcn.00407037
cmp eax, ebx
je 0x4039e0
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406fc7
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x4039e5
push 0xa
call fcn.00407037
push 8
call fcn.00407037
push 6
mov dword [0x42cbe4], eax
call fcn.00407037
cmp eax, ebx
je 0x403a28
push 0x1e
call eax
test eax, eax
je 0x403a28
or byte [0x42cbef], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42ccb8], eax
push ebx
lea eax, [esp + 0x34]
push 0x2b4
push eax
push ebx
push 0x422880
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x42bbe0
call fcn.00406a0f
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebp, 0x437000
push eax
push ebp
call fcn.00406a0f
cmp word [0x437000], 0x22
mov dword [0x42cbe0], 0x400000
mov eax, ebp
jne 0x403a91
push 0x22
mov eax, 0x437002
pop edi
push edi
push eax
call fcn.00406311
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [esp + 0x18], ecx
mov ax, word [ecx]
cmp ax, bx
je 0x403bc2
push 0x20
pop ebx
cmp ax, bx
jne 0x403ac0
inc ecx
inc ecx
cmp word [ecx], bx
je 0x403ab9
cmp word [ecx], 0x22
jne 0x403acb
inc ecx
push 0x22
inc ecx
pop ebx
cmp word [ecx], 0x2f
jne 0x403b8e
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403af6
mov ax, word [ecx + 2]
cmp ax, 0x20
je 0x403aec
test ax, ax
jne 0x403af6
mov dword [0x42cca0], 1
movzx eax, word [0x40b07e]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40b07c]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40b07a]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403b4c
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403b4c
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x403b47
test ax, ax
jne 0x403b4c
or dword [esp + 0x1c], 4
movzx eax, word [0x40b072]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40b070]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40b06e]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x403b8e
mov eax, dword [ecx]
cmp eax, edi
je 0x403bad
push ebx
push ecx
call fcn.00406311
mov ecx, eax
cmp word [ecx], 0x22
jne 0x403b9f
inc ecx
inc ecx
mov ax, word [ecx]
test ax, ax
jne 0x403ab1
jmp 0x403bc0
and word [ecx - 4], 0
add ecx, 4
push ecx
push 0x437800
call fcn.00406a0f
xor ebx, ebx
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov edi, 0x439800
push edi
push 0x400
call esi
call fcn.0040395f
test eax, eax
jne 0x403c34
push 0x3fb
push edi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push edi
call sub.KERNEL32.dll_lstrcatW
call fcn.0040395f
test eax, eax
jne 0x403c34
push edi
push 0x3fc
call esi
push 0x40b058
push edi
call sub.KERNEL32.dll_lstrcatW
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push edi
push str.TEMP
call esi
push edi
push 0x40b044
call esi
call fcn.0040395f
test eax, eax
je 0x403d06
push 0x439000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x1c]
call fcn.00403420
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403d06
cmp dword [0x42cc00], ebx
je 0x403cef
push ebx
push ebp
call fcn.00406311
mov esi, eax
cmp esi, ebp
jb 0x403cb9
movzx eax, word [0x40b03e]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40b03c]
movzx ecx, word [str.___]
cdq
or ebx, eax
movzx eax, word [0x40b03a]
shl eax, 0x10
or eax, ecx
xor ecx, ecx
cdq
or ecx, eax
mov eax, ebx
or eax, edx
mov edx, dword [esi]
cmp edx, ecx
jne 0x403cb1
mov edx, dword [esi + 4]
cmp edx, eax
je 0x403cb7
dec esi
dec esi
cmp esi, ebp
jae 0x403ca4
xor ebx, ebx
cmp esi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403d32
mov word [esi], bx
add esi, 8
push esi
call fcn.004063ec
test eax, eax
je 0x403d06
push esi
push 0x437800
call fcn.00406a0f
push esi
push 0x438000
call fcn.00406a0f
mov dword [esp + 0x10], ebx
or dword [0x42ccac], 0xffffffff
call fcn.00403feb
push 1
mov dword [esp + 0x18], eax
call fcn.00406d52
call fcn.00403ed8
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403e3c
push 0x200010
push dword [esp + 0x10]
call fcn.0040601c
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405f87
push 0x40b02c
push edi
mov esi, eax
call sub.KERNEL32.dll_lstrcatW
cmp esi, ebx
je 0x403d53
push 0x40b028
push edi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push edi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x438800
push ebp
push edi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403d06
cmp esi, ebx
push edi
je 0x403d7b
call fcn.00405eed
jmp 0x403d80
call fcn.00405f6a
push edi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x437800], bx
jne 0x403d9b
push ebp
push 0x437800
call fcn.00406a0f
push dword [esp + 0x18]
push section..ndata
call fcn.00406a0f
movzx eax, word [0x40b016]
movzx ecx, word [0x40b014]
shl eax, 0x10
or eax, ecx
push 0x1a
mov dword [0x42d800], eax
pop ebp
mov esi, 0x422080
mov eax, dword [0x42cbf4]
push dword [eax + 0x120]
push esi
call fcn.00406a31
push esi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [esp + 0x10], ebx
je 0x403e26
push 1
push esi
push 0x43a800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403e26
push ebx
push esi
call fcn.004067d5
mov eax, dword [0x42cbf4]
push dword [eax + 0x124]
push esi
call fcn.00406a31
push esi
call fcn.00405f9f
cmp eax, ebx
je 0x403e26
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc word [0x42d800]
dec ebp
jne 0x403dc9
push ebx
push edi
call fcn.004067d5
jmp 0x403d06
cmp dword [0x42cc94], ebx
je 0x403ec0
lea eax, [esp + 0x14]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403e90
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
lea eax, [esp + 0x24]
push ebx
push eax
push ebx
push dword [esp + 0x28]
mov dword [esp + 0x34], 1
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00407037
cmp eax, ebx
mov esi, 0x80040002
je 0x403eac
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403eb9
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403ec0
push 9
call fcn.0040140b
mov eax, dword [0x42ccac]
cmp eax, 0xffffffff
je 0x403ece
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]