Function at 0x403384
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 [0x42472c], eax
je 0x4033d6
push ebx
call fcn.004064d9
cmp eax, ebx
je 0x4033d6
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040646b
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4033db
push 0xa
call fcn.004064d9
push 8
call fcn.004064d9
push 6
mov dword [0x424724], eax
call fcn.004064d9
cmp eax, ebx
je 0x40341d
push 0x1e
call eax
test eax, eax
je 0x40341d
or byte [0x42472f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4247f8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x41fcf0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x423f20
call fcn.00406141
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x42a000
push eax
push ebp
call fcn.00406141
cmp byte [0x42a000], 0x22
mov dword [0x424720], 0x400000
mov eax, ebp
jne 0x403487
mov byte [esp + 0x14], 0x22
mov eax, 0x42a001
push dword [esp + 0x14]
push eax
call fcn.00405b04
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403561
cmp cl, 0x20
jne 0x4034ac
inc eax
cmp byte [eax], 0x20
je 0x4034a6
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4034bc
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403551
inc eax
cmp byte [eax], 0x53
jne 0x4034e1
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4034d7
cmp cl, bl
jne 0x4034e1
mov dword [0x4247e0], 1
movsx ecx, byte [0x40a1e7]
movsx edx, byte [0x40a1e6]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a1e5]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403521
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40351c
cmp cl, bl
jne 0x403521
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a1df]
movsx edx, byte [0x40a1de]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a1dd]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x40356d
push dword [esp + 0x14]
push eax
call fcn.00405b04
cmp byte [eax], 0x22
jne 0x403561
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4034a1
jmp 0x40357e
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x42a400
call fcn.00406141
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42b400
push esi
push 0x400
call edi
call fcn.00403353
test eax, eax
jne 0x4035f0
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403353
test eax, eax
jne 0x4035f0
push esi
push 0x3fc
call edi
push 0x40a1d0
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 0x40a1c4
call edi
call fcn.00403353
test eax, eax
je 0x40369e
push 0x42b000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402e14
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x40369e
cmp dword [0x424740], ebx
je 0x40368e
push ebx
push ebp
call fcn.00405b04
mov edi, eax
cmp edi, ebp
jb 0x403659
movsx eax, byte [0x40a1bf]
movsx ecx, byte [0x40a1be]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a1bd]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403659
dec edi
cmp edi, ebp
jae 0x403650
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x4036ca
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405bc7
test eax, eax
je 0x40369e
push edi
push 0x42a400
call fcn.00406141
push edi
push 0x42a800
call fcn.00406141
mov dword [esp + 0x10], ebx
or dword [0x4247ec], 0xffffffff
call fcn.0040395e
mov dword [esp + 0x18], eax
call fcn.0040386c
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x4037d2
push 0x200010
push dword [esp + 0x10]
call fcn.0040585d
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004057c8
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x4036eb
push 0x40a1b0
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x42ac00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x40369e
cmp edi, ebx
push esi
je 0x403713
call fcn.0040572e
jmp 0x403718
call fcn.004057ab
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x42a400], bl
jne 0x403732
push ebp
push 0x42a400
call fcn.00406141
push dword [esp + 0x1c]
push section..ndata
call fcn.00406141
movsx cx, byte [0x40a1a4]
xor eax, eax
push 0x1a
mov ah, byte [0x40a1a5]
pop ebp
or eax, ecx
mov edi, 0x41f8f0
mov word [0x425400], ax
mov eax, dword [0x424734]
push dword [eax + 0x120]
push edi
call fcn.00406163
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4037bd
push 1
push edi
push 0x42bc00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4037bd
push ebx
push edi
call fcn.00405f20
mov eax, dword [0x424734]
push dword [eax + 0x124]
push edi
call fcn.00406163
push edi
call fcn.004057e0
cmp eax, ebx
je 0x4037bd
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x425400]
dec ebp
jne 0x403760
push ebx
push esi
call fcn.00405f20
jmp 0x40369e
cmp dword [0x4247d4], ebx
je 0x403854
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 0x403825
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.004064d9
cmp eax, ebx
mov esi, 0x80040002
je 0x403841
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x40384d
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403854
push 9
call fcn.0040140b
mov eax, dword [0x4247ec]
cmp eax, 0xffffffff
je 0x403862
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]