Function at 0x40310f
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]
cmp ax, 6
je 0x403157
push ebx
call fcn.004060c8
cmp eax, ebx
je 0x403157
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040605a
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x40315c
push ebp
push 9
call fcn.004060c8
push 7
call fcn.004060c8
mov dword [0x42e404], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42e4b8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x428828
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42dc00
call fcn.00405d2f
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x434000
push eax
push ebp
call fcn.00405d2f
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x434000], 0x22
mov dword [0x42e400], eax
mov eax, ebp
jne 0x4031f0
mov byte [esp + 0x14], 0x22
mov eax, 0x434001
push dword [esp + 0x14]
push eax
call fcn.004057cc
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4032ca
cmp cl, 0x20
jne 0x403215
inc eax
cmp byte [eax], 0x20
je 0x40320f
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403225
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4032ba
inc eax
cmp byte [eax], 0x53
jne 0x40324a
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403240
cmp cl, bl
jne 0x40324a
mov dword [0x42e4a0], 1
movsx ecx, byte [0x409183]
movsx edx, byte [0x409182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x40328a
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403285
cmp cl, bl
jne 0x40328a
or dword [esp + 0x20], 4
movsx ecx, byte [0x40917b]
movsx edx, byte [0x40917a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4032d6
push dword [esp + 0x14]
push eax
call fcn.004057cc
cmp byte [eax], 0x22
jne 0x4032ca
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x40320a
jmp 0x4032e7
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x434400
call fcn.00405d2f
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x435400
push esi
push 0x400
call edi
call fcn.004030de
test eax, eax
jne 0x403359
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004030de
test eax, eax
jne 0x403359
push esi
push 0x3fc
call edi
push 0x40916c
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 0x409160
call edi
call fcn.004030de
test eax, eax
je 0x403407
push 0x435000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402c66
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403407
cmp dword [0x42e41c], ebx
je 0x4033f7
push ebx
push ebp
call fcn.004057cc
mov edi, eax
cmp edi, ebp
jb 0x4033c2
movsx eax, byte [0x40915b]
movsx ecx, byte [0x40915a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x409159]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x4033c2
dec edi
cmp edi, ebp
jae 0x4033b9
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403433
mov byte [edi], bl
add edi, 4
push edi
call fcn.0040588f
test eax, eax
je 0x403407
push edi
push 0x434400
call fcn.00405d2f
push edi
push 0x434800
call fcn.00405d2f
mov dword [esp + 0x10], ebx
or dword [0x42e4ac], 0xffffffff
call fcn.004036af
mov dword [esp + 0x18], eax
call fcn.004035d5
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x40353b
push 0x200010
push dword [esp + 0x10]
call fcn.00405525
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004054a8
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403454
push 0x40914c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x434c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403407
cmp edi, ebx
push esi
je 0x40347c
call fcn.0040540e
jmp 0x403481
call fcn.0040548b
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x434400], bl
jne 0x40349b
push ebp
push 0x434400
call fcn.00405d2f
push dword [esp + 0x1c]
push section..data_1
call fcn.00405d2f
movsx cx, byte [0x409140]
xor eax, eax
push 0x1a
mov ah, byte [0x409141]
pop ebp
or eax, ecx
mov edi, 0x428428
mov word [0x42f400], ax
mov eax, dword [0x42e410]
push dword [eax + 0x120]
push edi
call fcn.00405d51
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403526
push 1
push edi
push 0x435c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403526
push ebx
push edi
call fcn.00405bea
mov eax, dword [0x42e410]
push dword [eax + 0x124]
push edi
call fcn.00405d51
push edi
call fcn.004054c0
cmp eax, ebx
je 0x403526
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x42f400]
dec ebp
jne 0x4034c9
push ebx
push esi
call fcn.00405bea
jmp 0x403407
cmp dword [0x42e494], ebx
je 0x4035bd
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 0x40358e
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.004060c8
cmp eax, ebx
mov esi, 0x80040002
je 0x4035aa
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x4035b6
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4035bd
push 9
call fcn.0040140b
mov eax, dword [0x42e4ac]
cmp eax, 0xffffffff
je 0x4035cb
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]