cisvc.exe is a legitimate process, which represents the Microsoft Index Service Helper tool. This file is used for monitoring the performance of Microsoft Indexing Service process and helping people find all sorts of files, folders and other data in the system faster. Normally this executable file is located in C:\Windows\ folder. Although, this file is used for Windows operations, it is not an essential file. That means you can terminate it if you think that it slows down the system.
Cyber criminals are always seeking to find solutions for hiding their viruses and preventing their removal. That's why they sometimes rely on legitimate processes' names when giving names for their viruses. If you think that cisvc.exe is malicious, check it with RegCure Pro. Don't forget that security experts always recommend having a reliable security program installed on the system. You should also don't forget to upgrade it to the newest version and scan your computer every couple of days.