Function at 0x4034a8
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
mov dword [0x4243e0], eax
cmp ax, 6
je 0x4034fa
push ebx
call fcn.00405e50
cmp eax, ebx
je 0x4034fa
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00405de2
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4034ff
push 0xa
call fcn.00405e50
push 8
call fcn.00405e50
push 6
mov dword [0x4243e4], eax
call fcn.00405e50
cmp eax, ebx
je 0x403544
push 0x1e
call eax
test eax, eax
je 0x403544
or dword [0x4243e0], 0x40000000
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x160
mov dword [0x4244d8], eax
lea eax, [esp + 0x3c]
push eax
push ebx
push 0x408457
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x423be0
call fcn.00405cff
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov ebp, 0x42a000
push ebp
call fcn.00405cff
cmp byte [0x42a000], 0x22
mov dword [0x4243ec], 0x400000
mov eax, ebp
jne 0x4035ae
mov byte [esp + 0x14], 0x22
mov eax, 0x42a001
push dword [esp + 0x14]
push eax
call fcn.004058f6
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403633
cmp cl, 0x20
jne 0x4035d0
inc eax
cmp byte [eax], 0x20
je 0x4035ca
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4035e0
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403623
inc eax
cmp byte [eax], 0x53
jne 0x403601
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4035f7
cmp cl, bl
jne 0x403601
mov dword [0x4244c0], 1
cmp dword [eax], 0x4352434e
jne 0x40361a
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403615
cmp cl, bl
jne 0x40361a
or dword [esp + 0x20], 4
cmp dword [eax - 2], 0x3d442f20
je 0x40363b
push dword [esp + 0x14]
push eax
call fcn.004058f6
cmp byte [eax], 0x22
jne 0x403633
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4035c5
jmp 0x40364c
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x42a400
call fcn.00405cff
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42b400
push esi
push 0x400
call edi
call fcn.0040344d
test eax, eax
jne 0x4036be
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.0040344d
test eax, eax
jne 0x4036be
push esi
push 0x3fc
call edi
push 0x408440
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 0x408434
call edi
call fcn.0040344d
test eax, eax
je 0x40373f
push 0x42b000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00403154
mov dword [esp + 0x10], eax
cmp eax, ebx
jne 0x40373f
cmp dword [0x424444], ebx
je 0x40372f
push ebx
push ebp
call fcn.004058f6
mov edi, eax
jmp 0x4036f6
cmp dword [edi], 0x3d3f5f20
je 0x4036fa
dec edi
cmp edi, ebp
jae 0x4036ed
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x40376b
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405ff8
test eax, eax
je 0x40373f
push edi
push 0x42a400
call fcn.00405cff
push edi
push 0x42a800
call fcn.00405cff
mov dword [esp + 0x10], ebx
or dword [0x4244cc], 0xffffffff
call fcn.004054af
mov dword [esp + 0x18], eax
call fcn.0040347e
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403864
push 0x200010
push dword [esp + 0x10]
call fcn.00405890
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405f05
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x40378c
push 0x408428
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 0x40373f
push esi
cmp edi, ebx
je 0x4037b4
call fcn.00405774
jmp 0x4037b9
call fcn.004057f6
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x42a400], bl
jne 0x4037d3
push ebp
push 0x42a400
call fcn.00405cff
push dword [esp + 0x1c]
push section..ndata
call fcn.00405cff
push 0x41
pop eax
push 0x1a
mov word [0x425400], ax
pop ebp
mov edi, 0x41f5a0
mov eax, dword [0x4243f0]
push dword [eax + 0x120]
push edi
call fcn.0040607a
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x40384f
push 1
push edi
push 0x42bc00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x40384f
push ebx
push edi
call fcn.0040643b
mov eax, dword [0x4243f0]
push dword [eax + 0x124]
push edi
call fcn.0040607a
push edi
call fcn.00405813
cmp eax, ebx
je 0x40384f
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x425400]
dec ebp
jne 0x4037f2
push ebx
push esi
call fcn.0040643b
jmp 0x40373f
cmp dword [0x4244b4], ebx
je 0x4038e6
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
pop edi
test eax, eax
je 0x4038b7
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
push ebx
lea eax, [esp + 0x2c]
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.00405e50
mov esi, 0x80040002
cmp eax, ebx
je 0x4038d3
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x4038df
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4038e6
push 9
call fcn.0040141a
mov eax, dword [0x4244cc]
cmp eax, 0xffffffff
je 0x4038f4
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
jmp 0x403765