Function at 0x4031ff
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 [0x4233e0], eax
cmp ax, 6
je 0x403251
push ebx
call fcn.00405b9a
cmp eax, ebx
je 0x403251
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00405b2c
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403256
push 0xa
call fcn.00405b9a
push 8
call fcn.00405b9a
push 6
mov dword [0x4233e4], eax
call fcn.00405b9a
cmp eax, ebx
je 0x40329b
push 0x1e
call eax
test eax, eax
je 0x40329b
or dword [0x4233e0], 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 [0x4234d8], eax
lea eax, [esp + 0x3c]
push eax
push ebx
push 0x407427
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x422be0
call fcn.00405a48
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov ebp, 0x429000
push ebp
call fcn.00405a48
cmp byte [0x429000], 0x22
mov dword [0x4233ec], 0x400000
mov eax, ebp
jne 0x403305
mov byte [esp + 0x14], 0x22
mov eax, 0x429001
push dword [esp + 0x14]
push eax
call fcn.00405641
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x40338a
cmp cl, 0x20
jne 0x403327
inc eax
cmp byte [eax], 0x20
je 0x403321
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403337
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40337a
inc eax
cmp byte [eax], 0x53
jne 0x403358
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x40334e
cmp cl, bl
jne 0x403358
mov dword [0x4234c0], 1
cmp dword [eax], 0x4352434e
jne 0x403371
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40336c
cmp cl, bl
jne 0x403371
or dword [esp + 0x20], 4
cmp dword [eax - 2], 0x3d442f20
je 0x403392
push dword [esp + 0x14]
push eax
call fcn.00405641
cmp byte [eax], 0x22
jne 0x40338a
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x40331c
jmp 0x4033a3
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x429400
call fcn.00405a48
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42a400
push esi
push 0x400
call edi
call fcn.004031a4
test eax, eax
jne 0x403415
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004031a4
test eax, eax
jne 0x403415
push esi
push 0x3fc
call edi
push 0x407410
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 0x407404
call edi
call fcn.004031a4
test eax, eax
je 0x403496
push 0x42a000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402f59
mov dword [esp + 0x10], eax
cmp eax, ebx
jne 0x403496
cmp dword [0x423444], ebx
je 0x403486
push ebx
push ebp
call fcn.00405641
mov edi, eax
jmp 0x40344d
cmp dword [edi], 0x3d3f5f20
je 0x403451
dec edi
cmp edi, ebp
jae 0x403444
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x4034c2
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405d02
test eax, eax
je 0x403496
push edi
push 0x429400
call fcn.00405a48
push edi
push 0x429800
call fcn.00405a48
mov dword [esp + 0x10], ebx
or dword [0x4234cc], 0xffffffff
call fcn.00405201
mov dword [esp + 0x18], eax
call fcn.004031d5
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x4035bb
push 0x200010
push dword [esp + 0x10]
call fcn.004055db
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405c4e
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x4034e3
push 0x4073f8
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x429c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403496
push esi
cmp edi, ebx
je 0x40350b
call fcn.004054c1
jmp 0x403510
call fcn.00405541
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x429400], bl
jne 0x40352a
push ebp
push 0x429400
call fcn.00405a48
push dword [esp + 0x1c]
push section..ndata
call fcn.00405a48
push 0x41
pop eax
push 0x1a
mov word [0x424400], ax
pop ebp
mov edi, 0x41e5a0
mov eax, dword [0x4233f0]
push dword [eax + 0x120]
push edi
call fcn.00405d84
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4035a6
push 1
push edi
push 0x42ac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4035a6
push ebx
push edi
call fcn.0040614a
mov eax, dword [0x4233f0]
push dword [eax + 0x124]
push edi
call fcn.00405d84
push edi
call fcn.0040555e
cmp eax, ebx
je 0x4035a6
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x424400]
dec ebp
jne 0x403549
push ebx
push esi
call fcn.0040614a
jmp 0x403496
cmp dword [0x4234b4], ebx
je 0x40363d
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 0x40360e
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.00405b9a
mov esi, 0x80040002
cmp eax, ebx
je 0x40362a
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403636
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x40363d
push 9
call fcn.0040141a
mov eax, dword [0x4234cc]
cmp eax, 0xffffffff
je 0x40364b
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
jmp 0x4034bc