Function at 0x4031d6
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 [0x42370c], eax
je 0x403228
push ebx
call fcn.00406302
cmp eax, ebx
je 0x403228
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406294
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x40322d
push 0xa
call fcn.00406302
push 8
call fcn.00406302
push 6
mov dword [0x423704], eax
call fcn.00406302
cmp eax, ebx
je 0x40326f
push 0x1e
call eax
test eax, eax
je 0x40326f
or byte [0x42370f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4237d8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x41ecc8
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x422f00
call fcn.00405f6a
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x429000
push eax
push ebp
call fcn.00405f6a
cmp byte [0x429000], 0x22
mov dword [0x423700], 0x400000
mov eax, ebp
jne 0x4032d9
mov byte [esp + 0x14], 0x22
mov eax, 0x429001
push dword [esp + 0x14]
push eax
call fcn.0040592d
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4033b3
cmp cl, 0x20
jne 0x4032fe
inc eax
cmp byte [eax], 0x20
je 0x4032f8
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x40330e
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4033a3
inc eax
cmp byte [eax], 0x53
jne 0x403333
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403329
cmp cl, bl
jne 0x403333
mov dword [0x4237c0], 1
movsx ecx, byte [0x409183]
movsx edx, byte [0x409182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403373
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40336e
cmp cl, bl
jne 0x403373
or dword [esp + 0x20], 4
movsx ecx, byte [0x40917b]
movsx edx, byte [0x40917a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4033bf
push dword [esp + 0x14]
push eax
call fcn.0040592d
cmp byte [eax], 0x22
jne 0x4033b3
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4032f3
jmp 0x4033d0
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x429400
call fcn.00405f6a
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42a400
push esi
push 0x400
call edi
call fcn.004031a5
test eax, eax
jne 0x403442
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004031a5
test eax, eax
jne 0x403442
push esi
push 0x3fc
call edi
push 0x40916c
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 0x409160
call edi
call fcn.004031a5
test eax, eax
je 0x4034f0
push 0x42a000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402d63
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x4034f0
cmp dword [0x423720], ebx
je 0x4034e0
push ebx
push ebp
call fcn.0040592d
mov edi, eax
cmp edi, ebp
jb 0x4034ab
movsx eax, byte [0x40915b]
movsx ecx, byte [0x40915a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x409159]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x4034ab
dec edi
cmp edi, ebp
jae 0x4034a2
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x40351c
mov byte [edi], bl
add edi, 4
push edi
call fcn.004059f0
test eax, eax
je 0x4034f0
push edi
push 0x429400
call fcn.00405f6a
push edi
push 0x429800
call fcn.00405f6a
mov dword [esp + 0x10], ebx
or dword [0x4237cc], 0xffffffff
call fcn.00403798
mov dword [esp + 0x18], eax
call fcn.004036be
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403624
push 0x200010
push dword [esp + 0x10]
call fcn.00405686
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004055f1
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x40353d
push 0x40914c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x429c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x4034f0
cmp edi, ebx
push esi
je 0x403565
call fcn.00405557
jmp 0x40356a
call fcn.004055d4
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x429400], bl
jne 0x403584
push ebp
push 0x429400
call fcn.00405f6a
push dword [esp + 0x1c]
push section..ndata
call fcn.00405f6a
movsx cx, byte [0x409140]
xor eax, eax
push 0x1a
mov ah, byte [0x409141]
pop ebp
or eax, ecx
mov edi, 0x41e8c8
mov word [0x424400], ax
mov eax, dword [0x423714]
push dword [eax + 0x120]
push edi
call fcn.00405f8c
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x40360f
push 1
push edi
push 0x42ac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x40360f
push ebx
push edi
call fcn.00405d49
mov eax, dword [0x423714]
push dword [eax + 0x124]
push edi
call fcn.00405f8c
push edi
call fcn.00405609
cmp eax, ebx
je 0x40360f
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x424400]
dec ebp
jne 0x4035b2
push ebx
push esi
call fcn.00405d49
jmp 0x4034f0
cmp dword [0x4237b4], ebx
je 0x4036a6
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 0x403677
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.00406302
cmp eax, ebx
mov esi, 0x80040002
je 0x403693
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x40369f
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4036a6
push 9
call fcn.0040140b
mov eax, dword [0x4237cc]
cmp eax, 0xffffffff
je 0x4036b4
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]