From the Chirp page:
Warnings from AntiVirus and AntiMalware software about CHIRP
Users of CHIRP may experience false positives from their anti-virus/malware software, their browser, etc. Unfortunately, there are not easy solutions to this problem as CHIRP is a volunteer effort without the financial and legal resources to secure agreements with these companies. Further, CHIRP releases fixes and features very often, so that users get the latest stuff as soon as possible. That means the "reputation" for a given version of CHIRP may be lower, the newer it is.
For more information about false positives and AntiVirus in general, see some if these articles:
What are antivirus false positives?
How to tell if a virus is actually a false positive
Still paying for antivirus? Experts say you probably don't need it
Below are some common examples of what you may see, and how to handle them.
Recommendation: Tell your antivirus provider that the file is not a virus! They won't know if you don't tell them and especially if you're paying for their services, make them get it right. If you can report the file as safe, it helps the other users of CHIRP because it decreases the likelihood of them seeing a warning and improves the general "reputation" of the CHIRP project.
(The webpage goes on, but due to advertising I didn’t copy it all. If you want to know more go to https://chirpmyradio.com/projects/chirp/wiki/AntiVirusWarnings