Avast Report Trojan when Plugin Activated

Avast is reporting that my http://example.com/wp-admin page is unsafe. I have to disable my Avast software (http://www.avast.com/en-us/index) to be able to even get the login page to display. After I disable my Avast antivirus software, I can then log in to the backend of my website. I have uninstalled the iThemes Security plugin and turned Avast protection back on, and everything is fine. So I am only able to either have Avast antivirus OR the iThemes plugin active. If I have both active at the same time, I run into the issues explained above. Is anyone else having this problem?

https://ww.wp.xz.cn/plugins/better-wp-security/