Function at 0x403640
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:
push ebp
mov ebp, esp
sub esp, 0x3f4
push ebx
push esi
push edi
push 0x20
pop edi
xor ebx, ebx
push 0x8001
mov dword [ebp - 0x14], ebx
mov dword [ebp - 4], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 0x10], ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [ebp - 0x140]
push eax
mov dword [ebp - 0x12c], ebx
mov dword [ebp - 0x2c], ebx
mov dword [ebp - 0x28], ebx
mov dword [ebp - 0x140], 0x11c
call esi
test eax, eax
jne 0x4036ca
lea eax, [ebp - 0x140]
mov dword [ebp - 0x140], 0x114
push eax
call esi
mov ax, word [ebp - 0x12c]
mov ecx, dword [ebp - 0x112]
sub ax, 0x53
add ecx, 0xffffffd0
neg ax
sbb eax, eax
mov byte [ebp - 0x26], 4
not eax
and eax, ecx
mov word [ebp - 0x2c], ax
cmp dword [ebp - 0x13c], 0xa
jae 0x4036db
and word [ebp - 0x132], 0
mov eax, dword [ebp - 0x134]
movzx ecx, byte [ebp - 0x138]
mov dword [0x42a318], eax
xor eax, eax
mov ah, byte [ebp - 0x13c]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x2c]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x26]
or eax, ecx
mov dword [0x42a31c], eax
cmp word [0x42a31e], 0x600
je 0x40372e
push ebx
call fcn.00406a35
cmp eax, ebx
je 0x40372e
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004069c5
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403733
push 0xb
call fcn.00406a35
push 9
call fcn.00406a35
push 7
mov dword [0x42a264], eax
call fcn.00406a35
cmp eax, ebx
je 0x403776
push 0x1e
call eax
test eax, eax
je 0x403776
or byte [0x42a31c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42a320], eax
push ebx
lea eax, [ebp - 0x3f4]
push 0x2b4
push eax
push ebx
push 0x421708
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x429260
call fcn.00406668
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov esi, 0x435000
push eax
push esi
call fcn.00406668
push 0x22
mov eax, esi
pop esi
mov dword [0x42a260], 0x400000
cmp word [0x435000], si
jne 0x4037e1
mov edi, esi
mov eax, 0x435002
push edi
push eax
call fcn.00405f64
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [ebp - 0xc], ecx
jmp 0x4038eb
push 0x20
pop edx
cmp ax, dx
jne 0x403808
inc ecx
inc ecx
cmp word [ecx], dx
je 0x403801
cmp word [ecx], si
mov dword [ebp - 8], edx
jne 0x403815
inc ecx
mov dword [ebp - 8], esi
inc ecx
cmp word [ecx], 0x2f
jne 0x4038d9
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x40383f
mov ax, word [ecx + 2]
cmp ax, dx
je 0x403835
cmp ax, bx
jne 0x40383f
mov dword [0x42a300], 1
movzx eax, word [0x40a37e]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40a37c]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40a37a]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403894
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403894
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x403890
cmp ax, bx
jne 0x403894
or dword [ebp - 0x10], 4
movzx eax, word [0x40a372]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40a370]
cdq
movzx edx, word [0x40a36c]
or edi, eax
movzx eax, word [0x40a36e]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x4038d6
mov eax, dword [ecx]
cmp eax, edi
je 0x4038f9
push 0x22
pop esi
push dword [ebp - 8]
push ecx
call fcn.00405f64
mov ecx, eax
cmp word [ecx], si
jne 0x4038eb
inc ecx
inc ecx
mov ax, word [ecx]
cmp ax, bx
jne 0x4037f9
jmp 0x40390b
mov word [ecx - 4], bx
add ecx, 4
push ecx
push 0x435800
call fcn.00406668
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x437800
push esi
push 0x400
call edi
call fcn.0040360f
test eax, eax
jne 0x40397d
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.0040360f
test eax, eax
jne 0x40397d
push esi
push 0x3fc
call edi
push 0x40a358
push esi
call sub.KERNEL32.dll_lstrcatW
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push esi
push str.TEMP
call edi
push esi
push 0x40a344
call edi
call fcn.0040360f
test eax, eax
je 0x403b6c
push 0x437000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [ebp - 0x10]
call fcn.004030d0
cmp eax, ebx
mov dword [ebp - 4], eax
jne 0x403b6c
cmp dword [0x42a27c], ebx
je 0x403a48
push ebx
push 0x435000
call fcn.00405f64
mov edi, eax
cmp edi, 0x435000
jb 0x403a0c
movzx eax, word [0x40a33e]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40a33c]
movzx ecx, word [str.___]
cdq
or ebx, eax
movzx eax, word [0x40a33a]
shl eax, 0x10
or eax, ecx
xor ecx, ecx
cdq
or ecx, eax
mov eax, ebx
or eax, edx
mov edx, dword [edi]
cmp edx, ecx
jne 0x403a00
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403a0a
dec edi
dec edi
cmp edi, 0x435000
jae 0x4039f3
xor ebx, ebx
cmp edi, 0x435000
mov dword [ebp - 4], str.Error_launching_installer
jb 0x403a5c
mov word [edi], bx
add edi, 8
push edi
call fcn.0040603f
test eax, eax
je 0x403b6c
push edi
push 0x435800
call fcn.00406668
push edi
push 0x436000
call fcn.00406668
mov dword [ebp - 4], ebx
or dword [0x42a30c], 0xffffffff
call fcn.00403d17
mov dword [ebp - 0x14], eax
jmp 0x403b6c
call fcn.00405c33
push 0x40a32c
push esi
mov ebx, eax
call sub.KERNEL32.dll_lstrcatW
test ebx, ebx
je 0x403a7d
push 0x40a328
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov edi, 0x436800
push edi
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403b6a
test ebx, ebx
push esi
je 0x403aa9
call fcn.00405b99
jmp 0x403aae
call fcn.00405c16
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
xor ebx, ebx
cmp word [0x435800], bx
jne 0x403acb
push edi
push 0x435800
call fcn.00406668
push dword [ebp - 0xc]
push section..ndata
call fcn.00406668
movzx eax, word [0x40a316]
movzx ecx, word [0x40a314]
shl eax, 0x10
or eax, ecx
mov dword [ebp - 8], 0x1a
mov dword [0x42b800], eax
mov edi, 0x420f08
mov eax, dword [0x42a270]
push dword [eax + 0x120]
push edi
call fcn.004066a5
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [ebp - 4], ebx
je 0x403b57
push 1
push edi
push 0x438800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403b57
push ebx
push edi
call fcn.00406428
mov eax, dword [0x42a270]
push dword [eax + 0x124]
push edi
call fcn.004066a5
push edi
call fcn.00405c4b
cmp eax, ebx
je 0x403b57
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [ebp - 4], ebx
inc word [0x42b800]
dec dword [ebp - 8]
jne 0x403afc
push ebx
push esi
call fcn.00406428
xor ebx, ebx
call fcn.00403c25
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [ebp - 4], ebx
je 0x403b91
push 0x200010
push dword [ebp - 4]
call fcn.00405cc8
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x42a2f4], ebx
je 0x403c0f
lea eax, [ebp - 0xc]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403bdf
lea eax, [ebp - 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
lea eax, [ebp - 0x24]
push ebx
push eax
push ebx
push dword [ebp - 0xc]
mov dword [ebp - 0x24], 1
mov dword [ebp - 0x18], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406a35
cmp eax, ebx
mov esi, 0x80040002
je 0x403bfb
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403c08
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403c0f
push 9
call fcn.0040140b
mov eax, dword [0x42a30c]
cmp eax, 0xffffffff
je 0x403c1c
mov dword [ebp - 0x14], eax
push dword [ebp - 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]