cran.cvd file running in your system's background is a sign that it is infected with RealAV virus. However, there might be many other cyber threats that have started using this file for their own needs. In most of the cases, these dangerous programs seek to make people pay for their fake licensed versions. That's why they display misleading pop-up ads about nonexistent viruses and report about other computer-related issues. Please, do NOT fall into believing that RealAV or Real Antivirus is capable of fixing your computer! You should check it with reputable anti-virus and remove malicious files.
cran.cvd is installed as soon as virus, which is related to it, infects computer. After being installed, this file starts working on various activities that typically depend on virus type. It can be used just for displaying fake pop-up notifications and causing system's slow downs or for infecting it with specific files, blocking installed software and using techniques that can easily violate victim's privacy. Please, do NOT leave this file! In order to remove cran.cvd from the system, you should use RegCure Pro.