Function at 0x403312
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 0x403364
push ebx
call fcn.004064ca
cmp eax, ebx
je 0x403364
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040645c
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403369
push 0xb
call fcn.004064ca
push 9
call fcn.004064ca
push 7
mov dword [0x424724], eax
call fcn.004064ca
cmp eax, ebx
je 0x4033ab
push 0x1e
call eax
test eax, eax
je 0x4033ab
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 0x41fce8
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x423f20
call fcn.004060c1
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x42a000
push eax
push ebp
call fcn.004060c1
cmp byte [0x42a000], 0x22
mov dword [0x424720], 0x400000
mov eax, ebp
jne 0x403415
mov byte [esp + 0x14], 0x22
mov eax, 0x42a001
push dword [esp + 0x14]
push eax
call fcn.00405a84
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4034ef
cmp cl, 0x20
jne 0x40343a
inc eax
cmp byte [eax], 0x20
je 0x403434
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x40344a
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4034df
inc eax
cmp byte [eax], 0x53
jne 0x40346f
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403465
cmp cl, bl
jne 0x40346f
mov dword [0x4247e0], 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 0x4034af
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x4034aa
cmp cl, bl
jne 0x4034af
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 0x4034fb
push dword [esp + 0x14]
push eax
call fcn.00405a84
cmp byte [eax], 0x22
jne 0x4034ef
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x40342f
jmp 0x40350c
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x42a400
call fcn.004060c1
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42b400
push esi
push 0x400
call edi
call fcn.004032e1
test eax, eax
jne 0x40357e
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004032e1
test eax, eax
jne 0x40357e
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.004032e1
test eax, eax
je 0x40362c
push 0x42b000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402ea1
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x40362c
cmp dword [0x424740], ebx
je 0x40361c
push ebx
push ebp
call fcn.00405a84
mov edi, eax
cmp edi, ebp
jb 0x4035e7
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 0x4035e7
dec edi
cmp edi, ebp
jae 0x4035de
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403658
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405b47
test eax, eax
je 0x40362c
push edi
push 0x42a400
call fcn.004060c1
push edi
push 0x42a800
call fcn.004060c1
mov dword [esp + 0x10], ebx
or dword [0x4247ec], 0xffffffff
call fcn.004038d4
mov dword [esp + 0x18], eax
call fcn.004037fa
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403760
push 0x200010
push dword [esp + 0x10]
call fcn.004057dd
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405748
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403679
push 0x40a14c
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 0x40362c
cmp edi, ebx
push esi
je 0x4036a1
call fcn.004056ae
jmp 0x4036a6
call fcn.0040572b
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x42a400], bl
jne 0x4036c0
push ebp
push 0x42a400
call fcn.004060c1
push dword [esp + 0x1c]
push section..ndata
call fcn.004060c1
movsx cx, byte [0x40a140]
xor eax, eax
push 0x1a
mov ah, byte [0x40a141]
pop ebp
or eax, ecx
mov edi, 0x41f8e8
mov word [0x425400], ax
mov eax, dword [0x424734]
push dword [eax + 0x120]
push edi
call fcn.00406154
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x40374b
push 1
push edi
push 0x42bc00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x40374b
push ebx
push edi
call fcn.00405ea0
mov eax, dword [0x424734]
push dword [eax + 0x124]
push edi
call fcn.00406154
push edi
call fcn.00405760
cmp eax, ebx
je 0x40374b
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x425400]
dec ebp
jne 0x4036ee
push ebx
push esi
call fcn.00405ea0
jmp 0x40362c
cmp dword [0x4247d4], ebx
je 0x4037e2
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 0x4037b3
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.004064ca
cmp eax, ebx
mov esi, 0x80040002
je 0x4037cf
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x4037db
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4037e2
push 9
call fcn.0040140b
mov eax, dword [0x4247ec]
cmp eax, 0xffffffff
je 0x4037f0
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]