Function at 0x4033b8
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file attributes
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x224
push esi
push edi
xor edi, edi
push 0x8001
mov dword [ebp - 0x14], edi
mov dword [ebp - 0xc], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 8], edi
mov byte [ebp - 4], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExA]
lea eax, [ebp - 0xc4]
push eax
mov dword [ebp - 0xb0], edi
mov dword [ebp - 0x30], edi
mov dword [ebp - 0x2c], edi
mov dword [ebp - 0xc4], 0x9c
call esi
test eax, eax
jne 0x403449
lea eax, [ebp - 0xc4]
mov dword [ebp - 0xc4], 0x94
push eax
call esi
cmp dword [ebp - 0xb4], 2
jne 0x403450
movsx cx, byte [ebp - 0xa3]
mov al, byte [ebp - 0xb0]
sub ecx, 0x30
sub al, 0x53
mov byte [ebp - 0x2a], 4
neg al
sbb eax, eax
not eax
and eax, ecx
mov word [ebp - 0x30], ax
cmp dword [ebp - 0xb4], 2
jae 0x403474
and byte [ebp - 0x2a], 0
cmp byte [ebp - 0xaf], 0x41
jl 0x403470
movsx ax, byte [ebp - 0xaf]
sub eax, 0x40
mov word [ebp - 0x30], ax
jmp 0x403474
mov word [ebp - 0x30], di
cmp dword [ebp - 0xc0], 0xa
jae 0x403485
and word [ebp - 0xb6], 0
mov eax, dword [ebp - 0xb8]
movzx ecx, byte [ebp - 0xbc]
mov dword [0x42f0d8], eax
xor eax, eax
mov ah, byte [ebp - 0xc0]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x30]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x2a]
or eax, ecx
mov dword [0x42f0dc], eax
cmp word [0x42f0de], 0x600
je 0x4034d8
push edi
call fcn.00406695
cmp eax, edi
je 0x4034d8
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406627
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x4034dd
push 0xc
call fcn.00406695
push 0xa
call fcn.00406695
push 8
mov dword [0x42f024], eax
call fcn.00406695
cmp eax, edi
je 0x403520
push 0x1e
call eax
test eax, eax
je 0x403520
or byte [0x42f0dc], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push edi
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42f0e0], eax
push edi
lea eax, [ebp - 0x224]
push 0x160
push eax
push edi
push 0x429448
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42e820
call fcn.0040626d
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebx, 0x435000
push eax
push ebx
call fcn.0040626d
cmp byte [0x435000], 0x22
mov dword [0x42f020], 0x400000
mov eax, ebx
jne 0x40358b
mov byte [ebp - 4], 0x22
mov eax, 0x435001
push dword [ebp - 4]
push eax
call fcn.00405c2a
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [ebp - 0x10], eax
jmp 0x40365f
cmp cl, 0x20
jne 0x4035ae
inc eax
cmp byte [eax], 0x20
je 0x4035a8
cmp byte [eax], 0x22
mov byte [ebp - 4], 0x20
jne 0x4035bc
inc eax
mov byte [ebp - 4], 0x22
cmp byte [eax], 0x2f
jne 0x403650
inc eax
cmp byte [eax], 0x53
jne 0x4035e1
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4035d7
test cl, cl
jne 0x4035e1
mov dword [0x42f0c0], 1
movsx ecx, byte [0x40a177]
movsx edx, byte [0x40a176]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a175]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403620
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40361c
test cl, cl
jne 0x403620
or dword [ebp - 8], 4
movsx ecx, byte [0x40a16f]
movsx edx, byte [0x40a16e]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a16d]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a16c]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x40366b
push dword [ebp - 4]
push eax
call fcn.00405c2a
cmp byte [eax], 0x22
jne 0x40365f
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x4035a3
jmp 0x40367d
and byte [eax - 2], 0
add eax, 2
push eax
push 0x435400
call fcn.0040626d
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x436400
push esi
push 0x400
call edi
call fcn.00403387
test eax, eax
jne 0x4036ef
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403387
test eax, eax
jne 0x4036ef
push esi
push 0x3fc
call edi
push 0x40a160
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 0x40a154
call edi
call fcn.00403387
test eax, eax
je 0x40379a
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [ebp - 8]
call fcn.00402f11
test eax, eax
mov dword [ebp - 0xc], eax
jne 0x40379a
cmp dword [0x42f03c], eax
je 0x40378b
push eax
push ebx
call fcn.00405c2a
mov edi, eax
cmp edi, ebx
jb 0x403756
movsx eax, byte [0x40a14f]
movsx ecx, byte [0x40a14e]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a14d]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a14c]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403756
dec edi
cmp edi, ebx
jae 0x40374d
cmp edi, ebx
mov dword [ebp - 0xc], str.Error_launching_installer
jb 0x4037c6
and byte [edi], 0
add edi, 4
push edi
call fcn.00405ced
test eax, eax
je 0x40379a
push edi
push 0x435400
call fcn.0040626d
push edi
push 0x435800
call fcn.0040626d
and dword [ebp - 0xc], 0
or dword [0x42f0cc], 0xffffffff
call fcn.00403a76
mov dword [ebp - 0x14], eax
call fcn.0040399c
call dword [sym.imp.ole32.dll_OleUninitialize]
xor edi, edi
pop ebx
cmp dword [ebp - 0xc], edi
je 0x403908
push 0x200010
push dword [ebp - 0xc]
call fcn.00405983
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004058ee
push esi
mov dword [ebp - 0x18], eax
call sub.KERNEL32.dll_lstrlenA
push dword [ebp - 0x10]
mov edi, eax
push section..ndata
call fcn.0040626d
cmp byte [0x435400], 0
jne 0x4037fb
push 0x435c00
push 0x435400
call fcn.0040626d
lea eax, [edi + 0x436400]
mov dword [ebp - 8], 1
mov dword [ebp - 0x10], eax
mov edi, 0x431400
mov ebx, 0x431800
and dword [ebp - 4], 0
movzx eax, word [ebp - 8]
push eax
push str.nsu_X.tmp
push dword [ebp - 0x10]
call dword [sym.imp.USER32.dll_wsprintfA]
mov eax, dword [0x42f030]
add esp, 0xc
push dword [eax + 0x120]
push edi
call fcn.00406300
cmp dword [ebp - 0x18], 0
push esi
je 0x40384e
call fcn.00405877
jmp 0x403853
call fcn.004058d1
test eax, eax
je 0x40388f
push edi
call dword [sym.imp.KERNEL32.dll_GetFileAttributesA]
test ah, 4
jne 0x403880
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
test eax, eax
je 0x403880
push 1
push esi
call fcn.00405a2f
mov eax, dword [ebp - 4]
inc dword [ebp - 4]
test eax, eax
je 0x403819
inc dword [ebp - 8]
cmp word [ebp - 8], 0
jne 0x403815
jmp 0x40379a
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
push 0
push esi
call fcn.00406046
push 1
push edi
push 0x436c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x40379a
push 0
push edi
call fcn.00406046
mov eax, dword [0x42f030]
push dword [eax + 0x124]
push ebx
call fcn.00406300
push ebx
call fcn.00405906
test eax, eax
jne 0x4038f8
mov eax, dword [ebp - 4]
inc dword [ebp - 4]
test eax, eax
jne 0x40379a
push edi
call fcn.00406600
test eax, eax
je 0x403819
jmp 0x40379a
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [ebp - 0xc], 0
jmp 0x40379a
cmp dword [0x42f0b4], edi
je 0x403986
lea eax, [ebp - 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403956
lea eax, [ebp - 0x24]
push eax
push str.SeShutdownPrivilege
push edi
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push edi
push edi
lea eax, [ebp - 0x28]
push edi
push eax
push edi
push dword [ebp - 0x18]
mov dword [ebp - 0x28], 1
mov dword [ebp - 0x1c], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406695
cmp eax, edi
mov esi, 0x80040002
je 0x403972
push esi
push 0x25
push edi
push edi
push edi
call eax
test eax, eax
je 0x40397f
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403986
push 9
call fcn.0040140b
mov eax, dword [0x42f0cc]
cmp eax, 0xffffffff
je 0x403993
mov dword [ebp - 0x14], eax
push dword [ebp - 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]