Function at 0x403645
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, 0x3f8
push ebp
push esi
push edi
push 0x20
pop edi
xor ebp, ebp
push 0x8001
mov dword [esp + 0x20], ebp
mov dword [esp + 0x18], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x14], ebp
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [esp + 0x34]
push eax
mov dword [esp + 0x4c], ebp
mov dword [esp + 0x14c], ebp
mov dword [esp + 0x150], ebp
mov dword [esp + 0x38], 0x11c
call esi
test eax, eax
jne 0x4036d1
lea eax, [esp + 0x34]
mov dword [esp + 0x34], 0x114
push eax
call esi
mov ax, word [esp + 0x48]
mov ecx, dword [esp + 0x62]
sub ax, 0x53
add ecx, 0xffffffd0
neg ax
sbb eax, eax
mov byte [esp + 0x14e], 4
not eax
and eax, ecx
mov word [esp + 0x148], ax
cmp dword [esp + 0x38], 0xa
jae 0x4036de
and word [esp + 0x42], 0
mov eax, dword [esp + 0x40]
movzx ecx, byte [esp + 0x3c]
mov dword [0x429b18], eax
xor eax, eax
mov ah, byte [esp + 0x38]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [esp + 0x148]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [esp + 0x14e]
or eax, ecx
mov dword [0x429b1c], eax
cmp word [0x429b1e], 0x600
je 0x403733
push ebp
call fcn.00406a76
cmp eax, ebp
je 0x403733
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406a06
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403738
push 0xc
call fcn.00406a76
push 0xa
call fcn.00406a76
push 8
mov dword [0x429a64], eax
call fcn.00406a76
cmp eax, ebp
je 0x40377b
push 0x1e
call eax
test eax, eax
je 0x40377b
or byte [0x429b1c], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebp
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x429b20], eax
push ebp
lea eax, [esp + 0x158]
push 0x2b4
push eax
push ebp
push 0x420f08
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x428a60
call fcn.00406682
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebx, 0x434000
push eax
push ebx
call fcn.00406682
push 0x22
mov dword [0x429a60], 0x400000
pop esi
mov eax, ebx
cmp word [0x434000], si
jne 0x4037e8
mov edi, esi
mov eax, 0x434002
push edi
push eax
call fcn.00405f7e
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [esp + 0x1c], ecx
jmp 0x4038f7
push 0x20
pop edx
cmp ax, dx
jne 0x403810
inc ecx
inc ecx
cmp word [ecx], dx
je 0x403809
cmp word [ecx], si
mov dword [esp + 0x10], edx
jne 0x40381f
inc ecx
mov dword [esp + 0x10], esi
inc ecx
cmp word [ecx], 0x2f
jne 0x4038e4
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403849
mov ax, word [ecx + 2]
cmp ax, dx
je 0x40383f
cmp ax, bp
jne 0x403849
mov dword [0x429b00], 1
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 [str.NCRC]
or edi, eax
movzx eax, word [0x40a36e]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x40389f
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x40389f
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x40389a
cmp ax, bp
jne 0x40389f
or dword [esp + 0x14], 4
movzx eax, word [0x40a366]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40a364]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40a362]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x4038e1
mov eax, dword [ecx]
cmp eax, edi
je 0x403905
push 0x22
pop esi
push dword [esp + 0x10]
push ecx
call fcn.00405f7e
mov ecx, eax
cmp word [ecx], si
jne 0x4038f7
inc ecx
inc ecx
mov ax, word [ecx]
cmp ax, bp
jne 0x403801
jmp 0x403917
mov word [ecx - 4], bp
add ecx, 4
push ecx
push 0x434800
call fcn.00406682
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x436800
push esi
push 0x400
call edi
call fcn.00403614
test eax, eax
jne 0x403989
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403614
test eax, eax
jne 0x403989
push esi
push 0x3fc
call edi
push 0x40a34c
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 0x40a338
call edi
call fcn.00403614
test eax, eax
je 0x403b90
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x14]
call fcn.004030d5
cmp eax, ebp
mov dword [esp + 0x18], eax
jne 0x403b90
cmp dword [0x429a7c], ebp
je 0x403a48
push ebp
push ebx
call fcn.00405f7e
mov edi, eax
cmp edi, ebx
jb 0x403a0e
movzx eax, word [0x40a332]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebp, eax
movzx eax, word [0x40a330]
movzx ecx, word [0x40a32c]
cdq
or ebp, eax
movzx eax, word [0x40a32e]
shl eax, 0x10
or eax, ecx
xor ecx, ecx
cdq
or ecx, eax
mov eax, ebp
or eax, edx
mov edx, dword [edi]
cmp edx, ecx
jne 0x403a06
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403a0c
dec edi
dec edi
cmp edi, ebx
jae 0x4039f9
xor ebp, ebp
cmp edi, ebx
mov dword [esp + 0x18], str.Error_launching_installer
jb 0x403a5d
mov word [edi], bp
add edi, 8
push edi
call fcn.00406059
test eax, eax
je 0x403b90
push edi
push 0x434800
call fcn.00406682
push edi
push 0x435000
call fcn.00406682
mov dword [esp + 0x18], ebp
or dword [0x429b0c], 0xffffffff
call fcn.00403d54
mov dword [esp + 0x20], eax
jmp 0x403b90
call fcn.00405c4d
push esi
mov dword [esp + 0x28], eax
call sub.KERNEL32.dll_lstrlenW
push dword [esp + 0x1c]
mov edi, eax
push section..ndata
call fcn.00406682
cmp word [0x434800], bp
jne 0x403a94
push 0x435800
push 0x434800
call fcn.00406682
lea eax, [edi*2 + 0x436800]
mov dword [esp + 0x14], 1
mov dword [esp + 0x1c], eax
mov edi, 0x42c800
mov ebx, 0x42d000
mov dword [esp + 0x10], ebp
movzx ebp, word [esp + 0x14]
push ebp
push str.nsu_X.tmp
push dword [esp + 0x24]
call dword [sym.imp.USER32.dll_wsprintfW]
mov eax, dword [0x429a70]
add esp, 0xc
push dword [eax + 0x120]
push edi
call fcn.004066bf
cmp dword [esp + 0x24], 0
push esi
je 0x403aed
call fcn.00405bd6
jmp 0x403af2
call fcn.00405c30
test eax, eax
je 0x403b30
push edi
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test ah, 4
jne 0x403b21
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x403b21
push 1
push esi
call fcn.00405d8e
mov eax, dword [esp + 0x10]
inc dword [esp + 0x10]
test eax, eax
je 0x403aba
inc dword [esp + 0x14]
xor ebp, ebp
cmp word [esp + 0x14], bp
jne 0x403ab1
jmp 0x403b90
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push esi
call fcn.00406442
push 1
push edi
push 0x437800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403b8e
push 0
push edi
call fcn.00406442
mov eax, dword [0x429a70]
push dword [eax + 0x124]
push ebx
call fcn.004066bf
push ebx
call fcn.00405c65
test eax, eax
jne 0x403bb8
mov eax, dword [esp + 0x10]
inc dword [esp + 0x10]
test eax, eax
jne 0x403b8e
push edi
call fcn.004069df
test eax, eax
je 0x403aba
xor ebp, ebp
call fcn.00403c62
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x18], ebp
pop ebx
je 0x403bc6
push 0x200010
push dword [esp + 0x18]
call fcn.00405ce2
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x18], 0
jmp 0x403b8e
cmp dword [0x429af4], ebp
je 0x403c4a
lea eax, [esp + 0x20]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403c1a
lea eax, [esp + 0x28]
push eax
push str.SeShutdownPrivilege
push ebp
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebp
push ebp
lea eax, [esp + 0x2c]
push ebp
push eax
push ebp
push dword [esp + 0x34]
mov dword [esp + 0x3c], 1
mov dword [esp + 0x48], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406a76
cmp eax, ebp
mov esi, 0x80040002
je 0x403c36
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x403c43
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403c4a
push 9
call fcn.0040140b
mov eax, dword [0x429b0c]
cmp eax, 0xffffffff
je 0x403c58
mov dword [esp + 0x1c], eax
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.dll_ExitProcess]