Hello,
Welcome to Trend Micro Home Users Community!
I understand that you're experiencing high CPU usage from an app named Alructisit, which you suspect is malware but hasn’t been detected by Trend Micro Internet Security.
Here are some steps you can try to resolve this issue:
Manual Removal:
1. Check your Task Manager for any suspicious processes related to "Alructisit."
2. End the task if found, and then uninstall the application from your system.
You can also visit this
How to remove a virus from your Windows computer | Trend Micro Help Center
Hope this helps!