Function at 0x4043ba
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
push edi
push esi
push ebx
sub esp, 0x2fc
mov dword [esp], 0x8001
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
push esi
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
mov dword [0x43cae0], eax
cmp ax, 6
je 0x404405
mov dword [esp], 0
call fcn.00408d5e
push ebx
test eax, eax
je 0x404405
mov dword [esp], 0xc00
call eax
push ecx
mov ebx, str.UXTHEME
mov dword [esp], ebx
call fcn.00408cce
push eax
mov dword [esp], ebx
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea ebx, [ebx + eax + 1]
push edx
cmp byte [ebx], 0
jne 0x40440a
mov dword [esp], 0xa
call fcn.00408d5e
push ebx
mov dword [esp], 8
call fcn.00408d5e
push esi
mov dword [0x43cae4], eax
mov dword [esp], 6
call fcn.00408d5e
push edi
test eax, eax
je 0x40446e
mov dword [esp], 0x1e
call eax
push ecx
test eax, eax
je 0x40446e
or dword [0x43cae0], 0x40000000
call dword [sym.imp.COMCTL32.DLL_InitCommonControls]
mov dword [esp], 0
call dword [sym.imp.ole32.dll_OleInitialize]
push edi
mov dword [0x43ca58], eax
lea eax, [ebp - 0x2cc]
mov dword [esp + 0x10], 0
mov dword [esp + 0xc], 0x2b4
mov dword [esp + 8], eax
mov dword [esp + 4], 0
mov dword [esp], 0x40c41a
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
sub esp, 0x14
mov dword [esp + 4], str.NSIS_Error
mov dword [esp], 0x43cb00
call fcn.0040824c
push eax
push eax
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ecx, dword [0x40c8b4]
add ecx, 0xa000
mov dword [esp + 4], eax
mov dword [esp], ecx
mov dword [ebp - 0x2dc], ecx
call fcn.0040824c
push eax
push eax
mov dword [esp], 0
call dword [sym.imp.KERNEL32.dll_GetModuleHandleW]
mov dword [0x43caec], eax
mov eax, dword [0x40c8b4]
push edx
movzx eax, word [eax + 0xa000]
cmp ax, 0x22
jne 0x404528
mov ecx, dword [0x40c8b4]
lea edx, [ecx + 0xa002]
jmp 0x404533
mov edx, dword [ebp - 0x2dc]
mov eax, 0x20
mov dword [esp], edx
xor edi, edi
mov dword [esp + 4], eax
call fcn.00407add
push ebx
push ebx
mov dword [esp], eax
call dword [sym.imp.USER32.dll_CharNextW]
mov dword [ebp - 0x2e0], eax
push esi
cmp word [eax], 0
je 0x404614
movzx edx, word [eax]
cmp dx, 0x20
jne 0x40456b
add eax, 2
jmp 0x40455d
cmp dx, 0x22
jne 0x404576
add eax, 2
jmp 0x40457b
mov edx, 0x20
cmp word [eax], 0x2f
jne 0x4045f4
cmp word [eax + 2], 0x53
lea ebx, [eax + 2]
jne 0x40459d
test word [eax + 4], 0xffdf
jne 0x40459d
mov dword [0x43ca40], 1
cmp dword [eax + 6], 0x430052
jne 0x4045bd
cmp dword [eax + 2], 0x43004e
jne 0x4045bd
test word [eax + 0xa], 0xffdf
mov ecx, 4
cmove edi, ecx
cmp dword [eax + 2], 0x3d0044
jne 0x4045f2
cmp dword [eax - 2], 0x2f0020
jne 0x4045f2
mov word [eax - 2], 0
add eax, 6
mov dword [esp + 4], eax
mov eax, dword [0x40c8b4]
add eax, 0xa800
mov dword [esp], eax
call fcn.0040824c
push ecx
push ecx
jmp 0x404614
mov eax, ebx
mov dword [esp + 4], edx
mov dword [esp], eax
call fcn.00407add
push edx
push edx
cmp word [eax], 0x22
jne 0x404553
add eax, 2
jmp 0x404553
mov eax, dword [0x40c8b4]
mov dword [esp], 0x400
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
lea ebx, [eax + 0xc800]
mov dword [esp + 4], ebx
call esi
push eax
push eax
call fcn.00404318
test eax, eax
je 0x40466b
mov eax, dword [0x40c8b4]
add eax, 0xc000
mov dword [esp], eax
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push edx
mov dword [esp], edi
xor edi, edi
call fcn.00403ff5
mov esi, eax
push ecx
test eax, eax
jne 0x404946
jmp 0x4046f5
mov dword [esp + 4], 0x3fb
mov dword [esp], ebx
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push eax
push eax
mov dword [esp + 4], str.Temp
mov dword [esp], ebx
call sub.KERNEL32.dll_lstrcatW
push eax
push eax
call fcn.00404318
test eax, eax
jne 0x40463d
mov dword [esp + 4], ebx
mov dword [esp], 0x3fc
call esi
push esi
push esi
mov dword [esp + 4], 0x40c43e
mov dword [esp], ebx
call sub.KERNEL32.dll_lstrcatW
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push eax
push eax
mov dword [esp + 4], ebx
mov dword [esp], str.TEMP
call esi
push eax
push eax
mov dword [esp + 4], ebx
mov dword [esp], 0x40c450
call esi
push eax
push eax
call fcn.00404318
test eax, eax
jne 0x40463d
mov esi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
jmp 0x404944
cmp dword [0x43cac8], 0
je 0x404931
mov eax, dword [ebp - 0x2dc]
mov dword [esp + 4], 0
mov dword [esp], eax
call fcn.00407add
push ecx
push ecx
cmp dword [ebp - 0x2dc], eax
ja 0x40478c
cmp dword [eax + 4], 0x3d003f
je 0x404730
sub eax, 2
jmp 0x40471a
cmp dword [eax], 0x5f0020
jne 0x40472b
lea ebx, [eax + 8]
mov word [eax], 0
mov dword [esp], ebx
call fcn.00408996
push edx
test eax, eax
jne 0x404757
mov esi, str.Error_launching_installer
jmp 0x404944
mov eax, dword [0x40c8b4]
mov dword [esp + 4], ebx
add eax, 0xa800
mov dword [esp], eax
call fcn.0040824c
push eax
push eax
mov eax, dword [0x40c8b4]
add eax, 0xb000
mov dword [esp + 4], ebx
mov dword [esp], eax
call fcn.0040824c
push eax
push eax
jmp 0x404931
call fcn.00408daa
mov dword [esp + 4], str.nsu
mov dword [esp], ebx
mov esi, eax
call sub.KERNEL32.dll_lstrcatW
push eax
push eax
test esi, esi
je 0x4047bb
mov dword [esp + 4], 0x40c462
mov dword [esp], ebx
call sub.KERNEL32.dll_lstrcatW
push edi
push edi
mov dword [esp + 4], str..tmp
mov dword [esp], ebx
call sub.KERNEL32.dll_lstrcatW
mov eax, dword [0x40c8b4]
push edx
push edx
lea edi, [eax + 0xb800]
mov dword [esp + 4], edi
mov dword [esp], ebx
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
push ecx
push ecx
test eax, eax
je 0x40474d
mov dword [esp], ebx
test esi, esi
je 0x4047fd
call fcn.004078dc
jmp 0x404802
call fcn.00407970
push eax
mov dword [esp], ebx
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push eax
mov eax, dword [0x40c8b4]
cmp word [eax + 0xa800], 0
jne 0x40482f
add eax, 0xa800
mov dword [esp + 4], edi
mov dword [esp], eax
call fcn.0040824c
push eax
push eax
mov eax, dword [ebp - 0x2e0]
mov edi, 0x1a
mov esi, str.Error_launching_installer
mov dword [esp + 4], eax
mov eax, dword [0x40c8b4]
mov dword [esp], eax
call fcn.0040824c
push eax
push eax
mov eax, dword [0x40c8b4]
mov dword [eax + 0x800], 0x41
mov eax, dword [0x43ca60]
mov eax, dword [eax + 0x120]
mov dword [esp], 0x434480
mov dword [esp + 4], eax
call fcn.004083a4
push ecx
push ecx
mov dword [esp], 0x434480
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push eax
test esi, esi
je 0x40490a
mov eax, dword [0x40c8b4]
mov dword [esp + 8], 1
mov dword [esp + 4], 0x434480
add eax, 0xd800
mov dword [esp], eax
call dword [sym.imp.KERNEL32.dll_CopyFileW]
sub esp, 0xc
test eax, eax
je 0x40490a
mov dword [esp + 4], 0
mov dword [esp], 0x434480
call fcn.00408919
push eax
push eax
mov eax, dword [0x43ca60]
mov eax, dword [eax + 0x124]
mov dword [esp], 0x434480
mov dword [esp + 4], eax
call fcn.004083a4
push eax
push eax
mov dword [esp], 0x434480
call fcn.0040799e
push edx
test eax, eax
je 0x40490a
mov dword [esp], eax
xor esi, esi
call dword [sym.imp.KERNEL32.dll_CloseHandle]
push eax
mov eax, dword [0x40c8b4]
inc word [eax + 0x800]
dec edi
jne 0x404861
mov dword [esp + 4], 0
mov dword [esp], ebx
call fcn.00408919
push edi
push edi
jmp 0x404944
mov dword [0x43ca4c], 0xffffffff
call fcn.004062cc
mov edi, eax
jmp 0x404946
xor edi, edi
call fcn.00404373
call dword [sym.imp.ole32.dll_OleUninitialize]
test esi, esi
mov ebx, dword [sym.imp.KERNEL32.dll_ExitProcess]
je 0x404979
mov dword [esp], esi
mov dword [esp + 4], 0x200010
call fcn.00407a71
push esi
push esi
mov dword [esp], 2
jmp 0x404a99
cmp dword [0x43ca34], 0
je 0x404a8b
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
lea edx, [ebp - 0x2d0]
mov dword [esp + 4], 0x28
mov dword [esp + 8], edx
mov dword [esp], eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
sub esp, 0xc
test eax, eax
je 0x404a20
lea eax, [ebp - 0x2c8]
mov dword [esp + 4], str.SeShutdownPrivilege
lea esi, [ebp - 0x2cc]
mov dword [esp + 8], eax
mov dword [esp], 0
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
mov eax, dword [ebp - 0x2d0]
mov dword [ebp - 0x2cc], 1
mov dword [ebp - 0x2c0], 2
sub esp, 0xc
mov dword [esp + 0x14], 0
mov dword [esp + 0x10], 0
mov dword [esp + 0xc], 0
mov dword [esp + 8], esi
mov dword [esp + 4], 0
mov dword [esp], eax
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
sub esp, 0x18
mov dword [esp], 4
call fcn.00408d5e
push ecx
test eax, eax
jne 0x404a4e
mov dword [esp + 4], 0x80040002
mov dword [esp], 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
push edx
push edx
test eax, eax
je 0x404a7e
jmp 0x404a8b
mov dword [esp + 0x10], 0x80040002
mov dword [esp + 0xc], 0x25
mov dword [esp + 8], 0
mov dword [esp + 4], 0
mov dword [esp], 0
call eax
sub esp, 0x14
test eax, eax
jne 0x404a31
mov dword [esp], 9
call fcn.00403b62
push eax
mov eax, dword [0x43ca4c]
cmp eax, 0xffffffff
cmovne edi, eax
mov dword [esp], edi
call ebx
nop