Function at 0x40326b
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 [0x42f40c], eax
je 0x4032bd
push ebx
call fcn.004063a8
cmp eax, ebx
je 0x4032bd
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040633a
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4032c2
push 0xa
call fcn.004063a8
push 8
call fcn.004063a8
push 6
mov dword [0x42f404], eax
call fcn.004063a8
cmp eax, ebx
je 0x403304
push 0x1e
call eax
test eax, eax
je 0x403304
or byte [0x42f40f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42f4d8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x429830
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42ec00
call fcn.00406010
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x435000
push eax
push ebp
call fcn.00406010
cmp byte [0x435000], 0x22
mov dword [0x42f400], 0x400000
mov eax, ebp
jne 0x40336e
mov byte [esp + 0x14], 0x22
mov eax, 0x435001
push dword [esp + 0x14]
push eax
call fcn.004059d3
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403448
cmp cl, 0x20
jne 0x403393
inc eax
cmp byte [eax], 0x20
je 0x40338d
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4033a3
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403438
inc eax
cmp byte [eax], 0x53
jne 0x4033c8
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4033be
cmp cl, bl
jne 0x4033c8
mov dword [0x42f4c0], 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 0x403408
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403403
cmp cl, bl
jne 0x403408
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 0x403454
push dword [esp + 0x14]
push eax
call fcn.004059d3
cmp byte [eax], 0x22
jne 0x403448
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403388
jmp 0x403465
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x435400
call fcn.00406010
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x436400
push esi
push 0x400
call edi
call fcn.0040323a
test eax, eax
jne 0x4034d7
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.0040323a
test eax, eax
jne 0x4034d7
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.0040323a
test eax, eax
je 0x403585
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402dc4
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403585
cmp dword [0x42f420], ebx
je 0x403575
push ebx
push ebp
call fcn.004059d3
mov edi, eax
cmp edi, ebp
jb 0x403540
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 [0x40a158]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403540
dec edi
cmp edi, ebp
jae 0x403537
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x4035b1
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405a96
test eax, eax
je 0x403585
push edi
push 0x435400
call fcn.00406010
push edi
push 0x435800
call fcn.00406010
mov dword [esp + 0x10], ebx
or dword [0x42f4cc], 0xffffffff
call fcn.0040382d
mov dword [esp + 0x18], eax
call fcn.00403753
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x4036b9
push 0x200010
push dword [esp + 0x10]
call fcn.0040572c
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405697
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x4035d2
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 0x403585
cmp edi, ebx
push esi
je 0x4035fa
call fcn.004055fd
jmp 0x4035ff
call fcn.0040567a
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x435400], bl
jne 0x403619
push ebp
push 0x435400
call fcn.00406010
push dword [esp + 0x1c]
push section..ndata
call fcn.00406010
movsx cx, byte [0x40a140]
xor eax, eax
push 0x1a
mov ah, byte [0x40a141]
pop ebp
or eax, ecx
mov edi, 0x429430
mov word [0x430400], ax
mov eax, dword [0x42f414]
push dword [eax + 0x120]
push edi
call fcn.00406032
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4036a4
push 1
push edi
push 0x436c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4036a4
push ebx
push edi
call fcn.00405def
mov eax, dword [0x42f414]
push dword [eax + 0x124]
push edi
call fcn.00406032
push edi
call fcn.004056af
cmp eax, ebx
je 0x4036a4
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x430400]
dec ebp
jne 0x403647
push ebx
push esi
call fcn.00405def
jmp 0x403585
cmp dword [0x42f4b4], ebx
je 0x40373b
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 0x40370c
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.004063a8
cmp eax, ebx
mov esi, 0x80040002
je 0x403728
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403734
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x40373b
push 9
call fcn.0040140b
mov eax, dword [0x42f4cc]
cmp eax, 0xffffffff
je 0x403749
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]