Function at 0x4039ee
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
mov dword [0x445a20], eax
cmp ax, 6
je 0x403a3e
push ebx
call fcn.0040652b
cmp eax, ebx
je 0x403a3e
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004064bb
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403a43
push 0xa
call fcn.0040652b
push 8
call fcn.0040652b
push 6
mov dword [0x445a24], eax
call fcn.0040652b
cmp eax, ebx
je 0x403a88
push 0x1e
call eax
test eax, eax
je 0x403a88
or dword [0x445a20], 0x40000000
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x445b38], eax
lea eax, [esp + 0x38]
push eax
push ebx
push 0x4095c0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x444a20
call fcn.004063c1
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov ebp, 0x450000
push ebp
call fcn.004063c1
push 0x22
pop esi
mov dword [0x445a2c], 0x400000
mov eax, ebp
cmp word [0x450000], si
jne 0x403af2
mov edi, esi
mov eax, 0x450002
push edi
push eax
call fcn.00405f03
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov dword [esp + 0x18], eax
jmp 0x403b8c
push 0x20
pop edi
cmp cx, di
jne 0x403b18
inc eax
inc eax
cmp word [eax], di
je 0x403b11
mov edx, edi
cmp word [eax], si
jne 0x403b23
inc eax
inc eax
mov edx, esi
cmp word [eax], 0x2f
jne 0x403b7e
inc eax
inc eax
cmp word [eax], 0x53
jne 0x403b49
movzx ecx, word [eax + 2]
cmp cx, di
je 0x403b3f
cmp cx, bx
jne 0x403b49
mov dword [0x445b20], 1
cmp dword [eax], 0x43004e
jne 0x403b6d
cmp dword [eax + 4], 0x430052
jne 0x403b6d
movzx ecx, word [eax + 8]
cmp cx, di
je 0x403b68
cmp cx, bx
jne 0x403b6d
or dword [esp + 0x1c], 4
cmp dword [eax - 4], 0x2f0020
jne 0x403b7e
cmp dword [eax], 0x3d0044
je 0x403b9a
push edx
push eax
call fcn.00405f03
cmp word [eax], si
jne 0x403b8c
inc eax
inc eax
movzx ecx, word [eax]
cmp cx, bx
jne 0x403b09
jmp 0x403bae
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x450800
call fcn.004063c1
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x452800
push esi
push 0x400
call edi
call fcn.00403993
test eax, eax
jne 0x403c20
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403993
test eax, eax
jne 0x403c20
push esi
push 0x3fc
call edi
push 0x409594
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 0x409580
call edi
call fcn.00403993
test eax, eax
je 0x403cb3
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileW]
push 0x452000
call ebx
push dword [esp + 0x1c]
call fcn.00403586
mov dword [esp + 0x10], eax
test eax, eax
jne 0x403cb1
cmp dword [0x445a98], eax
je 0x403ca1
push eax
push ebp
call fcn.00405f03
mov edi, eax
jmp 0x403c64
cmp dword [edi], 0x5f0020
jne 0x403c62
cmp dword [edi + 4], 0x3d003f
je 0x403c68
dec edi
dec edi
cmp edi, ebp
jae 0x403c51
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x403cdf
xor eax, eax
mov word [edi], ax
add edi, 8
push edi
call fcn.0040671f
test eax, eax
je 0x403cb1
push edi
push 0x450800
call fcn.004063c1
push edi
push 0x451000
call fcn.004063c1
and dword [esp + 0x10], 0
or dword [0x445b2c], 0xffffffff
call fcn.00405aa8
mov dword [esp + 0x14], eax
xor ebx, ebx
call fcn.004039c4
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403ddb
push 0x200010
push dword [esp + 0x10]
call fcn.00405e9d
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.0040661c
push 0x409574
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
test edi, edi
je 0x403d00
push 0x409570
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x451800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403cb1
push esi
test edi, edi
je 0x403d28
call fcn.00405d81
jmp 0x403d2d
call fcn.00405e03
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x450800], 0
jne 0x403d49
push ebp
push 0x450800
call fcn.004063c1
push dword [esp + 0x18]
push section..ndata
call fcn.004063c1
push 0x1a
mov dword [0x446800], 0x41
pop ebp
mov edi, 0x43b548
mov eax, dword [0x445a30]
push dword [eax + 0x120]
push edi
call fcn.004067a7
push edi
call ebx
cmp dword [esp + 0x10], 0
je 0x403dc5
push 1
push edi
push 0x453800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403dc5
push 0
push edi
call fcn.00406b96
mov eax, dword [0x445a30]
push dword [eax + 0x124]
push edi
call fcn.004067a7
push edi
call fcn.00405e20
test eax, eax
je 0x403dc5
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x10], 0
inc word [0x446800]
dec ebp
jne 0x403d69
push ebp
push esi
call fcn.00406b96
jmp 0x403cb1
cmp dword [0x445b14], ebx
je 0x403e5f
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 0x403e2f
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
push ebx
lea eax, [esp + 0x28]
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.0040652b
mov esi, 0x80040002
cmp eax, ebx
je 0x403e4b
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403e58
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403e5f
push 9
call fcn.0040141a
mov eax, dword [0x445b2c]
cmp eax, 0xffffffff
je 0x403e6d
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
jmp 0x403cd9