Function at 0x4031ce
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 0x403220
push ebx
call fcn.004062da
cmp eax, ebx
je 0x403220
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040626c
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403225
push 0xa
call fcn.004062da
push 8
call fcn.004062da
push 6
mov dword [0x7a2f44], eax
call fcn.004062da
cmp eax, ebx
je 0x403267
push 0x1e
call eax
test eax, eax
je 0x403267
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.00405f42
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x7a9000
push eax
push ebp
call fcn.00405f42
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x7a9000], 0x22
mov dword [0x7a2f40], eax
mov eax, ebp
jne 0x4032d3
mov byte [esp + 0x14], 0x22
mov eax, 0x7a9001
push dword [esp + 0x14]
push eax
call fcn.00405905
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4033ad
cmp cl, 0x20
jne 0x4032f8
inc eax
cmp byte [eax], 0x20
je 0x4032f2
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403308
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40339d
inc eax
cmp byte [eax], 0x53
jne 0x40332d
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403323
cmp cl, bl
jne 0x40332d
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 0x40336d
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403368
cmp cl, bl
jne 0x40336d
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 0x4033b9
push dword [esp + 0x14]
push eax
call fcn.00405905
cmp byte [eax], 0x22
jne 0x4033ad
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4032ed
jmp 0x4033ca
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x7a9400
call fcn.00405f42
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x7aa400
push esi
push 0x400
call edi
call fcn.0040319d
test eax, eax
jne 0x40343c
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.0040319d
test eax, eax
jne 0x40343c
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.0040319d
test eax, eax
je 0x4034ea
push 0x7aa000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402d48
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x4034ea
cmp dword [0x7a2f60], ebx
je 0x4034da
push ebx
push ebp
call fcn.00405905
mov edi, eax
cmp edi, ebp
jb 0x4034a5
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 0x4034a5
dec edi
cmp edi, ebp
jae 0x40349c
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403516
mov byte [edi], bl
add edi, 4
push edi
call fcn.004059c8
test eax, eax
je 0x4034ea
push edi
push 0x7a9400
call fcn.00405f42
push edi
push 0x7a9800
call fcn.00405f42
mov dword [esp + 0x10], ebx
or dword [0x7a300c], 0xffffffff
call fcn.00403792
mov dword [esp + 0x18], eax
call fcn.004036b8
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x40361e
push 0x200010
push dword [esp + 0x10]
call fcn.0040565e
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004055c9
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403537
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 0x4034ea
cmp edi, ebx
push esi
je 0x40355f
call fcn.0040552f
jmp 0x403564
call fcn.004055ac
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x7a9400], bl
jne 0x40357e
push ebp
push 0x7a9400
call fcn.00405f42
push dword [esp + 0x1c]
push section..ndata
call fcn.00405f42
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.00405f64
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403609
push 1
push edi
push 0x7aac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403609
push ebx
push edi
call fcn.00405d21
mov eax, dword [0x7a2f54]
push dword [eax + 0x124]
push edi
call fcn.00405f64
push edi
call fcn.004055e1
cmp eax, ebx
je 0x403609
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x7a4400]
dec ebp
jne 0x4035ac
push ebx
push esi
call fcn.00405d21
jmp 0x4034ea
cmp dword [0x7a2ff4], ebx
je 0x4036a0
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 0x403671
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.004062da
cmp eax, ebx
mov esi, 0x80040002
je 0x40368d
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403699
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4036a0
push 9
call fcn.0040140b
mov eax, dword [0x7a300c]
cmp eax, 0xffffffff
je 0x4036ae
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]