Function at 0x4033b3
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:
push ebp
mov ebp, esp
sub esp, 0x220
push esi
push edi
xor edi, edi
push 0x8001
mov dword [ebp - 0x10], edi
mov dword [ebp - 4], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 8], edi
mov byte [ebp - 0xc], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExA]
lea eax, [ebp - 0xc0]
push eax
mov dword [ebp - 0xac], edi
mov dword [ebp - 0x2c], edi
mov dword [ebp - 0x28], edi
mov dword [ebp - 0xc0], 0x9c
call esi
test eax, eax
jne 0x403444
lea eax, [ebp - 0xc0]
mov dword [ebp - 0xc0], 0x94
push eax
call esi
cmp dword [ebp - 0xb0], 2
jne 0x40344b
movsx cx, byte [ebp - 0x9f]
mov al, byte [ebp - 0xac]
sub ecx, 0x30
sub al, 0x53
mov byte [ebp - 0x26], 4
neg al
sbb eax, eax
not eax
and eax, ecx
mov word [ebp - 0x2c], ax
cmp dword [ebp - 0xb0], 2
jae 0x40346f
and byte [ebp - 0x26], 0
cmp byte [ebp - 0xab], 0x41
jl 0x40346b
movsx ax, byte [ebp - 0xab]
sub eax, 0x40
mov word [ebp - 0x2c], ax
jmp 0x40346f
mov word [ebp - 0x2c], di
cmp dword [ebp - 0xbc], 0xa
jae 0x403480
and word [ebp - 0xb2], 0
mov eax, dword [ebp - 0xb4]
movzx ecx, byte [ebp - 0xb8]
mov dword [0x4524d8], eax
xor eax, eax
mov ah, byte [ebp - 0xbc]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x2c]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x26]
or eax, ecx
mov dword [0x4524dc], eax
cmp word [0x4524de], 0x600
je 0x4034d3
push edi
call fcn.00406663
cmp eax, edi
je 0x4034d3
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004065f5
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x4034d8
push 0xb
call fcn.00406663
push 9
call fcn.00406663
push 7
mov dword [0x452424], eax
call fcn.00406663
cmp eax, edi
je 0x40351b
push 0x1e
call eax
test eax, eax
je 0x40351b
or byte [0x4524dc], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push edi
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4524e0], eax
push edi
lea eax, [ebp - 0x220]
push 0x160
push eax
push edi
push 0x434050
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x44e420
call fcn.00406257
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebx, 0x47b000
push eax
push ebx
call fcn.00406257
cmp byte [0x47b000], 0x22
mov dword [0x452420], 0x400000
mov eax, ebx
jne 0x403586
mov byte [ebp - 0xc], 0x22
mov eax, 0x47b001
push dword [ebp - 0xc]
push eax
call fcn.00405c14
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [ebp - 0x14], eax
jmp 0x40365a
cmp cl, 0x20
jne 0x4035a9
inc eax
cmp byte [eax], 0x20
je 0x4035a3
cmp byte [eax], 0x22
mov byte [ebp - 0xc], 0x20
jne 0x4035b7
inc eax
mov byte [ebp - 0xc], 0x22
cmp byte [eax], 0x2f
jne 0x40364b
inc eax
cmp byte [eax], 0x53
jne 0x4035dc
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4035d2
test cl, cl
jne 0x4035dc
mov dword [0x4524c0], 1
movsx ecx, byte [0x40a183]
movsx edx, byte [0x40a182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x40361b
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403617
test cl, cl
jne 0x40361b
or dword [ebp - 8], 4
movsx ecx, byte [0x40a17b]
movsx edx, byte [0x40a17a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x403666
push dword [ebp - 0xc]
push eax
call fcn.00405c14
cmp byte [eax], 0x22
jne 0x40365a
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x40359e
jmp 0x403678
and byte [eax - 2], 0
add eax, 2
push eax
push 0x47d000
call fcn.00406257
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x485000
push esi
push 0x2000
call edi
call fcn.00403382
test eax, eax
jne 0x4036ea
push 0x1ffb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403382
test eax, eax
jne 0x4036ea
push esi
push 0x1ffc
call edi
push 0x40a16c
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 0x40a160
call edi
call fcn.00403382
test eax, eax
je 0x403795
push 0x483000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [ebp - 8]
call fcn.00402f0c
test eax, eax
mov dword [ebp - 4], eax
jne 0x403795
cmp dword [0x45243c], eax
je 0x403786
push eax
push ebx
call fcn.00405c14
mov edi, eax
cmp edi, ebx
jb 0x403751
movsx eax, byte [0x40a15b]
movsx ecx, byte [0x40a15a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a159]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403751
dec edi
cmp edi, ebx
jae 0x403748
cmp edi, ebx
mov dword [ebp - 4], str.Error_launching_installer
jb 0x4037c1
and byte [edi], 0
add edi, 4
push edi
call fcn.00405cd7
test eax, eax
je 0x403795
push edi
push 0x47d000
call fcn.00406257
push edi
push 0x47f000
call fcn.00406257
and dword [ebp - 4], 0
or dword [0x4524cc], 0xffffffff
call fcn.00403a3d
mov dword [ebp - 0x10], eax
call fcn.00403963
call dword [sym.imp.ole32.dll_OleUninitialize]
xor edi, edi
pop ebx
cmp dword [ebp - 4], edi
je 0x4038cf
push 0x200010
push dword [ebp - 4]
call fcn.0040596d
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004058d8
push str.nsu
push esi
mov ebx, eax
call sub.KERNEL32.dll_lstrcatA
test ebx, ebx
je 0x4037e2
push 0x40a14c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, 0x481000
push edi
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403795
test ebx, ebx
push esi
je 0x40380a
call fcn.0040583e
jmp 0x40380f
call fcn.004058bb
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x47d000], 0
jne 0x40382a
push edi
push 0x47d000
call fcn.00406257
push dword [ebp - 0x14]
push section..ndata
call fcn.00406257
movsx cx, byte [0x40a140]
xor eax, eax
mov dword [ebp - 8], 0x1a
mov ah, byte [0x40a141]
mov edi, 0x432050
or eax, ecx
mov word [0x455000], ax
mov eax, dword [0x452430]
push dword [eax + 0x120]
push edi
call fcn.004062ea
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
xor ebx, ebx
cmp dword [ebp - 4], ebx
je 0x4038b8
push 1
push edi
push 0x489000
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4038b8
push ebx
push edi
call fcn.00406030
mov eax, dword [0x452430]
push dword [eax + 0x124]
push edi
call fcn.004062ea
push edi
call fcn.004058f0
cmp eax, ebx
je 0x4038b8
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [ebp - 4], ebx
inc byte [0x455000]
dec dword [ebp - 8]
jne 0x40385b
push ebx
push esi
call fcn.00406030
jmp 0x403795
cmp dword [0x4524b4], edi
je 0x40394d
lea eax, [ebp - 0x14]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x40391d
lea eax, [ebp - 0x20]
push eax
push str.SeShutdownPrivilege
push edi
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push edi
push edi
lea eax, [ebp - 0x24]
push edi
push eax
push edi
push dword [ebp - 0x14]
mov dword [ebp - 0x24], 1
mov dword [ebp - 0x18], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406663
cmp eax, edi
mov esi, 0x80040002
je 0x403939
push esi
push 0x25
push edi
push edi
push edi
call eax
test eax, eax
je 0x403946
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x40394d
push 9
call fcn.0040140b
mov eax, dword [0x4524cc]
cmp eax, 0xffffffff
je 0x40395a
mov dword [ebp - 0x10], eax
push dword [ebp - 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]