Function at 0x403248
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, 0x184
push ebx
push esi
push edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x18], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x20], ebx
mov byte [esp + 0x14], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
cmp ax, 6
mov dword [0x7a2f4c], eax
je 0x40329a
push ebx
call fcn.00406385
cmp eax, ebx
je 0x40329a
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406317
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x40329f
push 0xa
call fcn.00406385
push 8
call fcn.00406385
push 6
mov dword [0x7a2f44], eax
call fcn.00406385
cmp eax, ebx
je 0x4032e1
push 0x1e
call eax
test eax, eax
je 0x4032e1
or byte [0x7a2f4f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x7a3018], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x79e508
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x7a2740
call fcn.00405fed
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x7a9000
push eax
push ebp
call fcn.00405fed
cmp byte [0x7a9000], 0x22
mov dword [0x7a2f40], 0x400000
mov eax, ebp
jne 0x40334b
mov byte [esp + 0x14], 0x22
mov eax, 0x7a9001
push dword [esp + 0x14]
push eax
call fcn.004059b0
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403425
cmp cl, 0x20
jne 0x403370
inc eax
cmp byte [eax], 0x20
je 0x40336a
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403380
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403415
inc eax
cmp byte [eax], 0x53
jne 0x4033a5
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x40339b
cmp cl, bl
jne 0x4033a5
mov dword [0x7a3000], 1
movsx ecx, byte [0x40a183]
movsx edx, byte [0x40a182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x4033e5
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x4033e0
cmp cl, bl
jne 0x4033e5
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a17b]
movsx edx, byte [0x40a17a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x403431
push dword [esp + 0x14]
push eax
call fcn.004059b0
cmp byte [eax], 0x22
jne 0x403425
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403365
jmp 0x403442
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x7a9400
call fcn.00405fed
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x7aa400
push esi
push 0x400
call edi
call fcn.00403217
test eax, eax
jne 0x4034b4
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403217
test eax, eax
jne 0x4034b4
push esi
push 0x3fc
call edi
push 0x40a16c
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push esi
push str.TEMP
call edi
push esi
push 0x40a160
call edi
call fcn.00403217
test eax, eax
je 0x403562
push 0x7aa000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402dc4
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403562
cmp dword [0x7a2f60], ebx
je 0x403552
push ebx
push ebp
call fcn.004059b0
mov edi, eax
cmp edi, ebp
jb 0x40351d
movsx eax, byte [0x40a15b]
movsx ecx, byte [0x40a15a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a159]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x40351d
dec edi
cmp edi, ebp
jae 0x403514
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x40358e
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405a73
test eax, eax
je 0x403562
push edi
push 0x7a9400
call fcn.00405fed
push edi
push 0x7a9800
call fcn.00405fed
mov dword [esp + 0x10], ebx
or dword [0x7a300c], 0xffffffff
call fcn.0040380a
mov dword [esp + 0x18], eax
call fcn.00403730
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403696
push 0x200010
push dword [esp + 0x10]
call fcn.00405709
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405674
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x4035af
push 0x40a14c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x7a9c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403562
cmp edi, ebx
push esi
je 0x4035d7
call fcn.004055da
jmp 0x4035dc
call fcn.00405657
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x7a9400], bl
jne 0x4035f6
push ebp
push 0x7a9400
call fcn.00405fed
push dword [esp + 0x1c]
push section..ndata
call fcn.00405fed
movsx cx, byte [0x40a140]
xor eax, eax
push 0x1a
mov ah, byte [0x40a141]
pop ebp
or eax, ecx
mov edi, 0x79e108
mov word [0x7a4400], ax
mov eax, dword [0x7a2f54]
push dword [eax + 0x120]
push edi
call fcn.0040600f
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403681
push 1
push edi
push 0x7aac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403681
push ebx
push edi
call fcn.00405dcc
mov eax, dword [0x7a2f54]
push dword [eax + 0x124]
push edi
call fcn.0040600f
push edi
call fcn.0040568c
cmp eax, ebx
je 0x403681
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x7a4400]
dec ebp
jne 0x403624
push ebx
push esi
call fcn.00405dcc
jmp 0x403562
cmp dword [0x7a2ff4], ebx
je 0x403718
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
push 2
test eax, eax
pop edi
je 0x4036e9
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
push eax
push ebx
push dword [esp + 0x2c]
mov dword [esp + 0x38], 1
mov dword [esp + 0x44], edi
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406385
cmp eax, ebx
mov esi, 0x80040002
je 0x403705
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403711
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403718
push 9
call fcn.0040140b
mov eax, dword [0x7a300c]
cmp eax, 0xffffffff
je 0x403726
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]