Function at 0x4031e9
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 [0x7a2f4c], eax
je 0x40323b
push ebx
call fcn.00406315
cmp eax, ebx
je 0x40323b
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004062a7
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403240
push 0xa
call fcn.00406315
push 8
call fcn.00406315
push 6
mov dword [0x7a2f44], eax
call fcn.00406315
cmp eax, ebx
je 0x403282
push 0x1e
call eax
test eax, eax
je 0x403282
or byte [0x7a2f4f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x7a3018], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x79e500
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x7a2740
call fcn.00405f7d
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x7a9000
push eax
push ebp
call fcn.00405f7d
cmp byte [0x7a9000], 0x22
mov dword [0x7a2f40], 0x400000
mov eax, ebp
jne 0x4032ec
mov byte [esp + 0x14], 0x22
mov eax, 0x7a9001
push dword [esp + 0x14]
push eax
call fcn.00405940
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4033c6
cmp cl, 0x20
jne 0x403311
inc eax
cmp byte [eax], 0x20
je 0x40330b
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403321
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4033b6
inc eax
cmp byte [eax], 0x53
jne 0x403346
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x40333c
cmp cl, bl
jne 0x403346
mov dword [0x7a3000], 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 0x403386
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403381
cmp cl, bl
jne 0x403386
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 0x4033d2
push dword [esp + 0x14]
push eax
call fcn.00405940
cmp byte [eax], 0x22
jne 0x4033c6
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403306
jmp 0x4033e3
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x7a9400
call fcn.00405f7d
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x7aa400
push esi
push 0x400
call edi
call fcn.004031b8
test eax, eax
jne 0x403455
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004031b8
test eax, eax
jne 0x403455
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.004031b8
test eax, eax
je 0x403503
push 0x7aa000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402d63
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403503
cmp dword [0x7a2f60], ebx
je 0x4034f3
push ebx
push ebp
call fcn.00405940
mov edi, eax
cmp edi, ebp
jb 0x4034be
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 0x4034be
dec edi
cmp edi, ebp
jae 0x4034b5
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x40352f
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405a03
test eax, eax
je 0x403503
push edi
push 0x7a9400
call fcn.00405f7d
push edi
push 0x7a9800
call fcn.00405f7d
mov dword [esp + 0x10], ebx
or dword [0x7a300c], 0xffffffff
call fcn.004037ab
mov dword [esp + 0x18], eax
call fcn.004036d1
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403637
push 0x200010
push dword [esp + 0x10]
call fcn.00405699
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405604
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403550
push 0x40a14c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x7a9c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403503
cmp edi, ebx
push esi
je 0x403578
call fcn.0040556a
jmp 0x40357d
call fcn.004055e7
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x7a9400], bl
jne 0x403597
push ebp
push 0x7a9400
call fcn.00405f7d
push dword [esp + 0x1c]
push section..ndata
call fcn.00405f7d
movsx cx, byte [0x40a140]
xor eax, eax
push 0x1a
mov ah, byte [0x40a141]
pop ebp
or eax, ecx
mov edi, 0x79e100
mov word [0x7a4400], ax
mov eax, dword [0x7a2f54]
push dword [eax + 0x120]
push edi
call fcn.00405f9f
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403622
push 1
push edi
push 0x7aac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403622
push ebx
push edi
call fcn.00405d5c
mov eax, dword [0x7a2f54]
push dword [eax + 0x124]
push edi
call fcn.00405f9f
push edi
call fcn.0040561c
cmp eax, ebx
je 0x403622
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x7a4400]
dec ebp
jne 0x4035c5
push ebx
push esi
call fcn.00405d5c
jmp 0x403503
cmp dword [0x7a2ff4], ebx
je 0x4036b9
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 0x40368a
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.00406315
cmp eax, ebx
mov esi, 0x80040002
je 0x4036a6
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x4036b2
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4036b9
push 9
call fcn.0040140b
mov eax, dword [0x7a300c]
cmp eax, 0xffffffff
je 0x4036c7
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]