Function at 0x403271
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, 0x180
push ebx
push ebp
push esi
push edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x1c], ebx
mov dword [esp + 0x14], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
xor esi, esi
mov byte [esp + 0x18], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
cmp ax, 6
je 0x4032b8
push ebx
call fcn.004060a9
cmp eax, ebx
je 0x4032b8
push 0xc00
call eax
push str.UXTHEME
call fcn.0040603f
push str.USERENV
call fcn.0040603f
push str.SETUPAPI
call fcn.0040603f
push 0xd
call fcn.004060a9
push 0xb
call fcn.004060a9
mov dword [0x42ec84], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42ed38], eax
push ebx
lea eax, [esp + 0x34]
push 0x160
push eax
push ebx
push 0x4290a0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42e480
call fcn.00405d1d
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x434000
push eax
push ebp
call fcn.00405d1d
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x434000], 0x22
mov dword [0x42ec80], eax
mov eax, ebp
jne 0x403354
mov byte [esp + 0x14], 0x22
mov eax, 0x434001
push dword [esp + 0x14]
push eax
call fcn.0040583b
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4033ce
cmp cl, 0x20
jne 0x403376
inc eax
cmp byte [eax], 0x20
je 0x403370
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403386
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4033be
inc eax
cmp byte [eax], 0x53
jne 0x40339f
mov cl, byte [eax + 1]
or cl, 0x20
cmp cl, 0x20
jne 0x40339f
or esi, 2
cmp dword [eax], 0x4352434e
jne 0x4033b5
mov cl, byte [eax + 4]
or cl, 0x20
cmp cl, 0x20
jne 0x4033b5
or esi, 4
cmp dword [eax - 2], 0x3d442f20
je 0x4033d6
push dword [esp + 0x14]
push eax
call fcn.0040583b
cmp byte [eax], 0x22
jne 0x4033ce
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x40336b
jmp 0x4033e7
mov dword [eax - 2], ebx
add eax, 2
push eax
push 0x434400
call fcn.00405d1d
mov edi, 0x435400
push edi
push 0x400
call dword [sym.imp.KERNEL32.dll_GetTempPathA]
call fcn.00403240
test eax, eax
jne 0x403421
push 0x3fb
push edi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push edi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403240
test eax, eax
je 0x40349f
push 0x435000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push esi
call fcn.00402c88
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x40349f
cmp dword [0x42ec9c], ebx
je 0x40348f
push ebx
push ebp
call fcn.0040583b
mov esi, eax
jmp 0x403456
cmp dword [esi], 0x3d3f5f20
je 0x40345a
dec esi
cmp esi, ebp
jae 0x40344d
cmp esi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x4034ca
mov byte [esi], bl
add esi, 4
push esi
call fcn.004058f1
test eax, eax
je 0x40349f
push esi
push 0x434400
call fcn.00405d1d
push esi
push 0x434800
call fcn.00405d1d
mov dword [esp + 0x10], ebx
or dword [0x42ed2c], 0xffffffff
call fcn.00403770
mov dword [esp + 0x18], eax
call fcn.0040367e
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
je 0x4035c3
push 0x200010
push dword [esp + 0x14]
call fcn.004055de
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405565
push str.nsu
push edi
mov esi, eax
call sub.KERNEL32.dll_lstrcatA
cmp esi, ebx
je 0x4034eb
push 0x4091ac
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 0x40349f
cmp esi, ebx
push edi
je 0x403513
call fcn.004054cb
jmp 0x403518
call fcn.00405548
push edi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x434400], bl
jne 0x403532
push ebp
push 0x434400
call fcn.00405d1d
push dword [esp + 0x1c]
push section..ndata
call fcn.00405d1d
push 0x1a
mov word [0x42f400], 0x41
pop ebp
mov esi, 0x428ca0
mov eax, dword [0x42ec90]
push dword [eax + 0x120]
push esi
call fcn.00405d3f
push esi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4035ae
push 1
push esi
push 0x435c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4035ae
push ebx
push esi
call fcn.00405a6b
mov eax, dword [0x42ec90]
push dword [eax + 0x124]
push esi
call fcn.00405d3f
push esi
call fcn.0040557d
cmp eax, ebx
je 0x4035ae
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x42f400]
dec ebp
jne 0x403551
push ebx
push edi
call fcn.00405a6b
jmp 0x40349f
cmp dword [0x42ed14], ebx
je 0x403666
push 5
call fcn.004060a9
push 6
mov ebp, eax
call fcn.004060a9
push 7
mov esi, eax
call fcn.004060a9
cmp ebp, ebx
mov edi, eax
je 0x403636
cmp esi, ebx
je 0x403636
cmp edi, ebx
je 0x403636
lea eax, [esp + 0x1c]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call ebp
test eax, eax
je 0x403636
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call esi
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
push eax
push ebx
push dword [esp + 0x30]
mov dword [esp + 0x38], 1
mov dword [esp + 0x44], 2
call edi
push 8
call fcn.004060a9
cmp eax, ebx
mov esi, 0x80040002
je 0x403652
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x40365f
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403666
push 9
call fcn.0040140b
mov eax, dword [0x42ed2c]
cmp eax, 0xffffffff
je 0x403674
mov dword [esp + 0x18], eax
push dword [esp + 0x18]
call dword [sym.imp.KERNEL32.dll_ExitProcess]