Function at 0x40312a
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file system object information
Set current directory
Shutdown system
Terminate process

Disassembly:
sub esp, 0x184
push ebx
push ebp
push esi
push edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x20], ebx
mov dword [esp + 0x14], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x1c], ebx
mov byte [esp + 0x18], 0x20
call dword [sym.imp.KERNEL32.DLL_SetErrorMode]
call dword [sym.imp.KERNEL32.DLL_GetVersion]
cmp ax, 6
je 0x403173
push ebx
call fcn.00405f57
cmp eax, ebx
je 0x403173
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00405ee9
push esi
call dword [sym.imp.KERNEL32.DLL_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403178
push 0xd
call fcn.00405f57
push 0xb
call fcn.00405f57
mov dword [0x42ec24], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42ecd8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x429058
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42e420
call fcn.00405bc7
call dword [sym.imp.KERNEL32.DLL_GetCommandLineA]
mov ebp, 0x434000
push eax
push ebp
call fcn.00405bc7
push ebx
call dword [sym.imp.KERNEL32.DLL_GetModuleHandleA]
cmp byte [0x434000], 0x22
mov dword [0x42ec20], eax
mov eax, ebp
jne 0x40320b
mov byte [esp + 0x14], 0x22
mov eax, 0x434001
push dword [esp + 0x14]
push eax
call fcn.004056e5
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x20], eax
jmp 0x403289
cmp cl, 0x20
jne 0x40322d
inc eax
cmp byte [eax], 0x20
je 0x403227
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x40323d
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403279
inc eax
cmp byte [eax], 0x53
jne 0x403258
mov cl, byte [eax + 1]
or cl, 0x20
cmp cl, 0x20
jne 0x403258
or dword [esp + 0x18], 2
cmp dword [eax], 0x4352434e
jne 0x403270
mov cl, byte [eax + 4]
or cl, 0x20
cmp cl, 0x20
jne 0x403270
or dword [esp + 0x18], 4
cmp dword [eax - 2], 0x3d442f20
je 0x403291
push dword [esp + 0x14]
push eax
call fcn.004056e5
cmp byte [eax], 0x22
jne 0x403289
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403222
jmp 0x4032a2
mov dword [eax - 2], ebx
add eax, 2
push eax
push 0x434400
call fcn.00405bc7
mov edi, 0x435400
push edi
push 0x400
call dword [sym.imp.KERNEL32.DLL_GetTempPathA]
call fcn.004030f9
test eax, eax
jne 0x4032e0
push 0x3fb
push edi
call dword [sym.imp.KERNEL32.DLL_GetWindowsDirectoryA]
push str.Temp
push edi
call sub.KERNEL32.DLL_lstrcatA
call fcn.004030f9
test eax, eax
je 0x403361
push 0x435000
call dword [sym.imp.KERNEL32.DLL_DeleteFileA]
push dword [esp + 0x18]
call fcn.00402c55
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403361
cmp dword [0x42ec3c], ebx
je 0x403351
push ebx
push ebp
call fcn.004056e5
mov esi, eax
jmp 0x403318
cmp dword [esi], 0x3d3f5f20
je 0x40331c
dec esi
cmp esi, ebp
jae 0x40330f
cmp esi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x40338c
mov byte [esi], bl
add esi, 4
push esi
call fcn.0040579b
test eax, eax
je 0x403361
push esi
push 0x434400
call fcn.00405bc7
push esi
push 0x434800
call fcn.00405bc7
mov dword [esp + 0x10], ebx
or dword [0x42eccc], 0xffffffff
call fcn.0040361a
mov dword [esp + 0x1c], eax
call fcn.00403540
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
je 0x403485
push 0x200010
push dword [esp + 0x14]
call fcn.00405488
push 2
call dword [sym.imp.KERNEL32.DLL_ExitProcess]
call fcn.0040540f
push str.nsu
push edi
mov esi, eax
call sub.KERNEL32.DLL_lstrcatA
cmp esi, ebx
je 0x4033ad
push 0x409148
push edi
call sub.KERNEL32.DLL_lstrcatA
push str..tmp
push edi
call sub.KERNEL32.DLL_lstrcatA
mov ebp, 0x434c00
push ebp
push edi
call dword [sym.imp.KERNEL32.DLL_lstrcmpiA]
test eax, eax
je 0x403361
cmp esi, ebx
push edi
je 0x4033d5
call fcn.00405375
jmp 0x4033da
call fcn.004053f2
push edi
call dword [sym.imp.KERNEL32.DLL_SetCurrentDirectoryA]
cmp byte [0x434400], bl
jne 0x4033f4
push ebp
push 0x434400
call fcn.00405bc7
push dword [esp + 0x20]
push section..ndata
call fcn.00405bc7
push 0x1a
mov word [0x42f400], 0x41
pop ebp
mov esi, 0x428c58
mov eax, dword [0x42ec30]
push dword [eax + 0x120]
push esi
call fcn.00405be9
push esi
call dword [sym.imp.KERNEL32.DLL_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403470
push 1
push esi
push 0x435c00
call dword [sym.imp.KERNEL32.DLL_CopyFileA]
test eax, eax
je 0x403470
push ebx
push esi
call fcn.00405915
mov eax, dword [0x42ec30]
push dword [eax + 0x124]
push esi
call fcn.00405be9
push esi
call fcn.00405427
cmp eax, ebx
je 0x403470
push eax
call dword [sym.imp.KERNEL32.DLL_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x42f400]
dec ebp
jne 0x403413
push ebx
push edi
call fcn.00405915
jmp 0x403361
cmp dword [0x42ecb4], ebx
je 0x403528
push 5
call fcn.00405f57
push 6
mov ebp, eax
call fcn.00405f57
push 7
mov esi, eax
call fcn.00405f57
cmp ebp, ebx
mov edi, eax
je 0x4034f8
cmp esi, ebx
je 0x4034f8
cmp edi, ebx
je 0x4034f8
lea eax, [esp + 0x20]
push eax
push 0x28
call dword [sym.imp.KERNEL32.DLL_GetCurrentProcess]
push eax
call ebp
test eax, eax
je 0x4034f8
lea eax, [esp + 0x28]
push eax
push str.SeShutdownPrivilege
push ebx
call esi
push ebx
push ebx
lea eax, [esp + 0x2c]
push ebx
push eax
push ebx
push dword [esp + 0x34]
mov dword [esp + 0x3c], 1
mov dword [esp + 0x48], 2
call edi
push 8
call fcn.00405f57
cmp eax, ebx
mov esi, 0x80040002
je 0x403514
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403521
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403528
push 9
call fcn.0040140b
mov eax, dword [0x42eccc]
cmp eax, 0xffffffff
je 0x403536
mov dword [esp + 0x1c], eax
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.DLL_ExitProcess]