Function at 0x4031bb
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 0x40320d
push ebx
call fcn.004062c7
cmp eax, ebx
je 0x40320d
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406259
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403212
push 0xa
call fcn.004062c7
push 8
call fcn.004062c7
push 6
mov dword [0x423704], eax
call fcn.004062c7
cmp eax, ebx
je 0x403254
push 0x1e
call eax
test eax, eax
je 0x403254
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.00405f2f
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x429000
push eax
push ebp
call fcn.00405f2f
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x429000], 0x22
mov dword [0x423700], eax
mov eax, ebp
jne 0x4032c0
mov byte [esp + 0x14], 0x22
mov eax, 0x429001
push dword [esp + 0x14]
push eax
call fcn.004058f2
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x40339a
cmp cl, 0x20
jne 0x4032e5
inc eax
cmp byte [eax], 0x20
je 0x4032df
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4032f5
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40338a
inc eax
cmp byte [eax], 0x53
jne 0x40331a
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403310
cmp cl, bl
jne 0x40331a
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 0x40335a
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403355
cmp cl, bl
jne 0x40335a
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 0x4033a6
push dword [esp + 0x14]
push eax
call fcn.004058f2
cmp byte [eax], 0x22
jne 0x40339a
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4032da
jmp 0x4033b7
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x429400
call fcn.00405f2f
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42a400
push esi
push 0x400
call edi
call fcn.0040318a
test eax, eax
jne 0x403429
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.0040318a
test eax, eax
jne 0x403429
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.0040318a
test eax, eax
je 0x4034d7
push 0x42a000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402d48
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x4034d7
cmp dword [0x423720], ebx
je 0x4034c7
push ebx
push ebp
call fcn.004058f2
mov edi, eax
cmp edi, ebp
jb 0x403492
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 0x403492
dec edi
cmp edi, ebp
jae 0x403489
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403503
mov byte [edi], bl
add edi, 4
push edi
call fcn.004059b5
test eax, eax
je 0x4034d7
push edi
push 0x429400
call fcn.00405f2f
push edi
push 0x429800
call fcn.00405f2f
mov dword [esp + 0x10], ebx
or dword [0x4237cc], 0xffffffff
call fcn.0040377f
mov dword [esp + 0x18], eax
call fcn.004036a5
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x40360b
push 0x200010
push dword [esp + 0x10]
call fcn.0040564b
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004055b6
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403524
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 0x4034d7
cmp edi, ebx
push esi
je 0x40354c
call fcn.0040551c
jmp 0x403551
call fcn.00405599
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x429400], bl
jne 0x40356b
push ebp
push 0x429400
call fcn.00405f2f
push dword [esp + 0x1c]
push section..ndata
call fcn.00405f2f
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.00405f51
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4035f6
push 1
push edi
push 0x42ac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4035f6
push ebx
push edi
call fcn.00405d0e
mov eax, dword [0x423714]
push dword [eax + 0x124]
push edi
call fcn.00405f51
push edi
call fcn.004055ce
cmp eax, ebx
je 0x4035f6
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x424400]
dec ebp
jne 0x403599
push ebx
push esi
call fcn.00405d0e
jmp 0x4034d7
cmp dword [0x4237b4], ebx
je 0x40368d
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 0x40365e
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.004062c7
cmp eax, ebx
mov esi, 0x80040002
je 0x40367a
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403686
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x40368d
push 9
call fcn.0040140b
mov eax, dword [0x4237cc]
cmp eax, 0xffffffff
je 0x40369b
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]