Function at 0x4034ce
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, 0x218
push ebx
push ebp
push esi
push edi
xor ebx, ebx
mov edi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
push 0x8001
mov dword [esp + 0x14], ebx
mov ebp, ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExA]
lea eax, [esp + 0x2c]
xorps xmm0, xmm0
mov dword [esp + 0x40], ebx
push eax
movlpd qword [esp + 0xc4], xmm0
mov dword [esp + 0x30], 0x9c
call esi
test eax, eax
jne 0x403558
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x94
push eax
call esi
mov eax, dword [esp + 0x3c]
cmp eax, 2
jne 0x40355f
cmp byte [esp + 0x40], 0x53
mov byte [esp + 0xc6], 4
jne 0x40354c
movsx ax, byte [esp + 0x4d]
sub ax, 0x30
jmp 0x40357a
xor ecx, ecx
mov word [esp + 0xc0], cx
jmp 0x40355c
mov eax, dword [esp + 0x3c]
cmp eax, 2
jae 0x403582
mov al, byte [esp + 0x41]
mov byte [esp + 0xc6], bl
cmp al, 0x41
jl 0x403578
cbw
sub ax, 0x40
jmp 0x40357a
xor eax, eax
mov word [esp + 0xc0], ax
cmp dword [esp + 0x30], 0xa
jae 0x403594
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403598
mov eax, dword [esp + 0x38]
mov dword [0x7a2d18], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0xc0]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, byte [esp + 0xc6]
or ecx, eax
mov eax, 0x600
mov dword [0x7a2d1c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x4035f2
push ebx
call fcn.0040653c
test eax, eax
je 0x4035f2
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00405ea1
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x4035f7
push 0xb
call fcn.0040653c
push 9
call fcn.0040653c
push 7
mov dword [0x7a2410], eax
call fcn.0040653c
test eax, eax
je 0x403638
push 0x1e
call eax
test eax, eax
je 0x403638
or byte [0x7a2d1c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x160
mov dword [0x7a2c80], eax
lea eax, [esp + 0xd0]
push eax
push ebx
push 0x408453
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x7a2420
call fcn.00406761
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov ebx, 0x7a8000
push ebx
call fcn.00406761
cmp byte [0x7a8000], 0x22
mov edx, 0x7a8001
mov dword [0x7a2414], 0x400000
sete al
lea eax, [eax*2 + 0x20]
push eax
mov eax, ebx
cmove eax, edx
push eax
call fcn.0040623b
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov ecx, eax
mov dword [esp + 0x14], ecx
jmp 0x403736
inc ecx
mov dl, byte [ecx]
cmp dl, 0x20
je 0x4036c0
mov byte [esp + 0x18], 0x20
mov bl, dl
cmp dl, 0x22
jne 0x4036db
mov bl, byte [ecx + 1]
mov byte [esp + 0x18], dl
lea eax, [ecx + 1]
cmovne eax, ecx
cmp bl, 0x2f
jne 0x403722
inc eax
cmp byte [eax], 0x53
jne 0x403702
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4036f8
test cl, cl
jne 0x403702
mov dword [0x7a2d00], 1
cmp dword [eax], 0x4352434e
jne 0x403719
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403716
test cl, cl
jne 0x403719
or ebp, 4
cmp dword [eax - 2], 0x3d442f20
je 0x40373e
push dword [esp + 0x18]
push eax
call fcn.0040623b
mov ecx, eax
mov dl, byte [ecx]
cmp dl, 0x22
jne 0x403738
inc ecx
mov dl, byte [ecx]
test dl, dl
jne 0x4036c3
jmp 0x403750
mov byte [eax - 2], 0
add eax, 2
push eax
push 0x7a8400
call fcn.00406761
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov ebx, 0x7a9400
push ebx
push 0x400
call esi
call fcn.00403a23
test eax, eax
jne 0x4037c2
push 0x3fb
push ebx
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push ebx
call sub.KERNEL32.dll_lstrcatA
call fcn.00403a23
test eax, eax
jne 0x4037c2
push ebx
push 0x3fc
call esi
push 0x408468
push ebx
call sub.KERNEL32.dll_lstrcatA
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push ebx
push str.TEMP
call esi
push ebx
push 0x408474
call esi
call fcn.00403a23
test eax, eax
je 0x40395b
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileA]
push 0x7a9000
call ebx
push ebp
call fcn.004031c2
mov edi, eax
test edi, edi
jne 0x40395b
cmp dword [0x7a2c24], eax
je 0x403839
push eax
mov ebp, 0x7a8000
push ebp
call fcn.0040623b
mov esi, eax
jmp 0x403800
cmp dword [esi], 0x3d3f5f20
je 0x403804
dec esi
cmp esi, ebp
jae 0x4037f7
mov edi, str.Error_launching_installer
cmp esi, ebp
jb 0x40384c
mov byte [esi], 0
add esi, 4
push esi
call fcn.00406278
test eax, eax
je 0x40395b
push esi
push 0x7a8400
call fcn.00406761
push esi
push 0x7a8800
call fcn.00406761
xor edi, edi
or dword [0x7a2d0c], 0xffffffff
call fcn.0040570f
mov ebx, eax
jmp 0x40395f
call fcn.00406143
push str.nsu
mov ebp, 0x7a9400
mov esi, eax
push ebp
call sub.KERNEL32.dll_lstrcatA
test esi, esi
je 0x403872
push 0x408480
push ebp
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push ebp
call sub.KERNEL32.dll_lstrcatA
push 0x7a8c00
push ebp
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x40395b
push ebp
test esi, esi
je 0x40389d
call fcn.00405b38
jmp 0x4038a2
call fcn.00405b18
push ebp
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x7a8400], 0
jne 0x4038c1
push 0x7a8c00
push 0x7a8400
call fcn.00406761
push dword [esp + 0x14]
push section..ndata
call fcn.00406761
push 0x41
pop eax
push 0x1a
mov word [0x7a3400], ax
pop esi
mov eax, dword [0x7a2c30]
push dword [eax + 0x120]
push 0x79dde0
call fcn.00405bb4
push 0x79dde0
call ebx
test edi, edi
je 0x403949
push 1
push 0x79dde0
push 0x7a9c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403949
push 0
push 0x79dde0
call fcn.00405f3c
mov eax, dword [0x7a2c30]
push dword [eax + 0x124]
push 0x79dde0
call fcn.00405bb4
push 0x79dde0
call fcn.00406311
test eax, eax
je 0x403949
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor edi, edi
inc byte [0x7a3400]
sub esi, 1
jne 0x4038db
push esi
push ebp
call fcn.00405f3c
mov ebx, dword [esp + 0x10]
call fcn.004034a4
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x403981
push 0x200010
push edi
call fcn.004066ef
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x7a2cf4], 0
je 0x403a0f
lea eax, [esp + 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 0x4039dd
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push 0
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
xor ecx, ecx
mov dword [esp + 0x1c], 1
push ecx
push ecx
push ecx
lea eax, [esp + 0x28]
mov dword [esp + 0x34], 2
push eax
push ecx
push dword [esp + 0x28]
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.0040653c
mov esi, 0x80040002
test eax, eax
je 0x4039fb
push esi
push 0x25
xor ecx, ecx
push ecx
push ecx
push ecx
call eax
test eax, eax
je 0x403a08
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403a0f
push 9
call fcn.00401533
cmp dword [0x7a2d0c], 0xffffffff
cmovne ebx, dword [0x7a2d0c]
push ebx
jmp 0x40397b