Function at 0x404a82
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 [0x449d80], eax
cmp ax, 6
je 0x404acd
mov dword [esp], 0
call fcn.00409960
push ebx
test eax, eax
je 0x404acd
mov dword [esp], 0xc00
call eax
push ecx
mov ebx, str.UXTHEME
mov dword [esp], ebx
call fcn.004098d0
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 0x404ad2
mov dword [esp], 0xb
call fcn.00409960
push ebx
mov dword [esp], 9
call fcn.00409960
push esi
mov dword [0x449d84], eax
mov dword [esp], 7
call fcn.00409960
push edi
test eax, eax
je 0x404b36
mov dword [esp], 0x1e
call eax
push ecx
test eax, eax
je 0x404b36
or dword [0x449d80], 0x40000000
call dword [sym.imp.COMCTL32.DLL_InitCommonControls]
mov dword [esp], 0
call dword [sym.imp.ole32.dll_OleInitialize]
push edi
mov dword [section..bss], 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], 0x40d0ba
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
sub esp, 0x14
mov dword [esp + 4], str.NSIS_Error
mov dword [esp], 0x449da0
call fcn.00408a99
push eax
push eax
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ecx, dword [0x40d9d4]
add ecx, 0x50000
mov dword [esp + 4], eax
mov dword [esp], ecx
mov dword [ebp - 0x2dc], ecx
call fcn.00408a99
push eax
push eax
mov dword [esp], 0
call dword [sym.imp.KERNEL32.dll_GetModuleHandleW]
mov dword [0x449d88], eax
mov eax, dword [0x40d9d4]
push edx
movzx eax, word [eax + 0x50000]
cmp ax, 0x22
jne 0x404bf0
mov ecx, dword [0x40d9d4]
lea edx, [ecx + 0x50002]
jmp 0x404bfb
mov edx, dword [ebp - 0x2dc]
mov eax, 0x20
mov dword [esp], edx
xor edi, edi
mov dword [esp + 4], eax
call fcn.0040832d
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 0x404cdc
movzx edx, word [eax]
cmp dx, 0x20
jne 0x404c33
add eax, 2
jmp 0x404c25
cmp dx, 0x22
jne 0x404c3e
add eax, 2
jmp 0x404c43
mov edx, 0x20
cmp word [eax], 0x2f
jne 0x404cbc
cmp word [eax + 2], 0x53
lea ebx, [eax + 2]
jne 0x404c65
test word [eax + 4], 0xffdf
jne 0x404c65
mov dword [0x418080], 1
cmp dword [eax + 6], 0x430052
jne 0x404c85
cmp dword [eax + 2], 0x43004e
jne 0x404c85
test word [eax + 0xa], 0xffdf
mov ecx, 4
cmove edi, ecx
cmp dword [eax + 2], 0x3d0044
jne 0x404cba
cmp dword [eax - 2], 0x2f0020
jne 0x404cba
mov word [eax - 2], 0
add eax, 6
mov dword [esp + 4], eax
mov eax, dword [0x40d9d4]
add eax, 0x54000
mov dword [esp], eax
call fcn.00408a99
push ecx
push ecx
jmp 0x404cdc
mov eax, ebx
mov dword [esp + 4], edx
mov dword [esp], eax
call fcn.0040832d
push edx
push edx
cmp word [eax], 0x22
jne 0x404c1b
add eax, 2
jmp 0x404c1b
mov eax, dword [0x40d9d4]
mov dword [esp], 0x2000
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
lea ebx, [eax + 0x64000]
mov dword [esp + 4], ebx
call esi
push eax
push eax
call fcn.004049e0
test eax, eax
je 0x404d33
mov eax, dword [0x40d9d4]
add eax, 0x60000
mov dword [esp], eax
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push edx
mov dword [esp], edi
xor edi, edi
call fcn.004046bf
mov esi, eax
push ecx
test eax, eax
jne 0x40501b
jmp 0x404dbd
mov dword [esp + 4], 0x1ffb
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.004049e0
test eax, eax
jne 0x404d05
mov dword [esp + 4], ebx
mov dword [esp], 0x1ffc
call esi
push esi
push esi
mov dword [esp + 4], 0x40d0de
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], 0x40d0f0
call esi
push eax
push eax
call fcn.004049e0
test eax, eax
jne 0x404d05
mov esi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
jmp 0x405019
cmp dword [0x42c124], 0
je 0x404ff9
mov eax, dword [ebp - 0x2dc]
mov dword [esp + 4], 0
mov dword [esp], eax
call fcn.0040832d
push ecx
push ecx
cmp dword [ebp - 0x2dc], eax
ja 0x404e54
cmp dword [eax + 4], 0x3d003f
je 0x404df8
sub eax, 2
jmp 0x404de2
cmp dword [eax], 0x5f0020
jne 0x404df3
lea ebx, [eax + 8]
mov word [eax], 0
mov dword [esp], ebx
call fcn.00409534
push edx
test eax, eax
jne 0x404e1f
mov esi, str.Error_launching_installer
jmp 0x405019
mov eax, dword [0x40d9d4]
mov dword [esp + 4], ebx
add eax, 0x54000
mov dword [esp], eax
call fcn.00408a99
push eax
push eax
mov eax, dword [0x40d9d4]
add eax, 0x58000
mov dword [esp + 4], ebx
mov dword [esp], eax
call fcn.00408a99
push eax
push eax
jmp 0x404ff9
call fcn.004099ac
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 0x404e83
mov dword [esp + 4], 0x40d102
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 [0x40d9d4]
push edx
push edx
lea edi, [eax + 0x5c000]
mov dword [esp + 4], edi
mov dword [esp], ebx
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
push ecx
push ecx
test eax, eax
je 0x404e15
mov dword [esp], ebx
test esi, esi
je 0x404ec5
call fcn.0040812c
jmp 0x404eca
call fcn.004081c0
push eax
mov dword [esp], ebx
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push eax
mov eax, dword [0x40d9d4]
cmp word [eax + 0x54000], 0
jne 0x404ef7
add eax, 0x54000
mov dword [esp + 4], edi
mov dword [esp], eax
call fcn.00408a99
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 [0x40d9d4]
mov dword [esp], eax
call fcn.00408a99
push eax
push eax
mov eax, dword [0x40d9d4]
mov dword [eax + 0x4000], 0x41
mov eax, dword [0x42c130]
mov eax, dword [eax + 0x120]
mov dword [esp], 0x451da0
mov dword [esp + 4], eax
call fcn.00408c3e
push ecx
push ecx
mov dword [esp], 0x451da0
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push eax
test esi, esi
je 0x404fd2
mov eax, dword [0x40d9d4]
mov dword [esp + 8], 1
mov dword [esp + 4], 0x451da0
add eax, 0x6c000
mov dword [esp], eax
call dword [sym.imp.KERNEL32.dll_CopyFileW]
sub esp, 0xc
test eax, eax
je 0x404fd2
mov dword [esp + 4], 0
mov dword [esp], 0x451da0
call fcn.004091b7
push eax
push eax
mov eax, dword [0x42c130]
mov eax, dword [eax + 0x124]
mov dword [esp], 0x451da0
mov dword [esp + 4], eax
call fcn.00408c3e
push eax
push eax
mov dword [esp], 0x451da0
call fcn.004081ee
push edx
test eax, eax
je 0x404fd2
mov dword [esp], eax
xor esi, esi
call dword [sym.imp.KERNEL32.dll_CloseHandle]
push eax
mov eax, dword [0x40d9d4]
inc word [eax + 0x4000]
dec edi
jne 0x404f29
mov dword [esp + 4], 0
mov dword [esp], ebx
call fcn.004091b7
push eax
push eax
jmp 0x405019
mov dword [0x41808c], 0xffffffff
call fcn.00406a94
mov dword [esp], 1
mov edi, eax
call fcn.004091fc
push eax
jmp 0x40501b
xor edi, edi
call fcn.00404a3b
call dword [sym.imp.ole32.dll_OleUninitialize]
test esi, esi
mov ebx, dword [sym.imp.KERNEL32.dll_ExitProcess]
je 0x40504e
mov dword [esp], esi
mov dword [esp + 4], 0x200010
call fcn.004082c1
push esi
push esi
mov dword [esp], 2
jmp 0x40516e
cmp dword [0x418074], 0
je 0x405160
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 0x4050f5
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.00409960
push ecx
test eax, eax
jne 0x405123
mov dword [esp + 4], 0x80040002
mov dword [esp], 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
push edx
push edx
test eax, eax
je 0x405153
jmp 0x405160
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 0x405106
mov dword [esp], 9
call fcn.00404234
push eax
mov eax, dword [0x41808c]
cmp eax, 0xffffffff
cmovne edi, eax
mov dword [esp], edi
call ebx