Function at 0x403348
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
cmp ax, 6
mov dword [0x42f42c], eax
je 0x40339a
push ebx
call fcn.00406500
cmp eax, ebx
je 0x40339a
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406492
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x40339f
push 0xb
call fcn.00406500
push 9
call fcn.00406500
push 7
mov dword [0x42f424], eax
call fcn.00406500
cmp eax, ebx
je 0x4033e1
push 0x1e
call eax
test eax, eax
je 0x4033e1
or byte [0x42f42f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42f4f8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x429850
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42ec20
call fcn.004060f7
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x435000
push eax
push ebp
call fcn.004060f7
cmp byte [0x435000], 0x22
mov dword [0x42f420], 0x400000
mov eax, ebp
jne 0x40344b
mov byte [esp + 0x14], 0x22
mov eax, 0x435001
push dword [esp + 0x14]
push eax
call fcn.00405aba
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403525
cmp cl, 0x20
jne 0x403470
inc eax
cmp byte [eax], 0x20
je 0x40346a
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403480
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403515
inc eax
cmp byte [eax], 0x53
jne 0x4034a5
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x40349b
cmp cl, bl
jne 0x4034a5
mov dword [0x42f4e0], 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 0x4034e5
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x4034e0
cmp cl, bl
jne 0x4034e5
or dword [esp + 0x20], 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 0x403531
push dword [esp + 0x14]
push eax
call fcn.00405aba
cmp byte [eax], 0x22
jne 0x403525
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403465
jmp 0x403542
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x435400
call fcn.004060f7
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x436400
push esi
push 0x400
call edi
call fcn.00403317
test eax, eax
jne 0x4035b4
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403317
test eax, eax
jne 0x4035b4
push esi
push 0x3fc
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.00403317
test eax, eax
je 0x403662
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402ea1
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403662
cmp dword [0x42f440], ebx
je 0x403652
push ebx
push ebp
call fcn.00405aba
mov edi, eax
cmp edi, ebp
jb 0x40361d
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 0x40361d
dec edi
cmp edi, ebp
jae 0x403614
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x40368e
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405b7d
test eax, eax
je 0x403662
push edi
push 0x435400
call fcn.004060f7
push edi
push 0x435800
call fcn.004060f7
mov dword [esp + 0x10], ebx
or dword [0x42f4ec], 0xffffffff
call fcn.0040390a
mov dword [esp + 0x18], eax
call fcn.00403830
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403796
push 0x200010
push dword [esp + 0x10]
call fcn.00405813
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.0040577e
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x4036af
push 0x40a14c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x435c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403662
cmp edi, ebx
push esi
je 0x4036d7
call fcn.004056e4
jmp 0x4036dc
call fcn.00405761
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x435400], bl
jne 0x4036f6
push ebp
push 0x435400
call fcn.004060f7
push dword [esp + 0x1c]
push section..ndata
call fcn.004060f7
movsx cx, byte [0x40a140]
xor eax, eax
push 0x1a
mov ah, byte [0x40a141]
pop ebp
or eax, ecx
mov edi, 0x429450
mov word [0x430400], ax
mov eax, dword [0x42f434]
push dword [eax + 0x120]
push edi
call fcn.0040618a
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403781
push 1
push edi
push 0x436c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403781
push ebx
push edi
call fcn.00405ed6
mov eax, dword [0x42f434]
push dword [eax + 0x124]
push edi
call fcn.0040618a
push edi
call fcn.00405796
cmp eax, ebx
je 0x403781
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x430400]
dec ebp
jne 0x403724
push ebx
push esi
call fcn.00405ed6
jmp 0x403662
cmp dword [0x42f4d4], ebx
je 0x403818
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
test eax, eax
pop edi
je 0x4037e9
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
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.00406500
cmp eax, ebx
mov esi, 0x80040002
je 0x403805
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403811
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403818
push 9
call fcn.0040140b
mov eax, dword [0x42f4ec]
cmp eax, 0xffffffff
je 0x403826
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]