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There is little information to work with in your post.

The malware name in itself isn’t that useful, A screenshot of the Avast Alert window with the See details option selected might help.
Attaching Images to your post - When you Click the Reply button it opens a text window for you to post your comment (reply or post).
Click the Preview button, that shows what you have input and expands it to include ‘Attachments and other options’. Click that it further expands, here you can attach images, etc. at the bottom of your post.
See my attached image, click to expand.

Since this happens when you start your computer (and you aren’t making this connection), something on your computer is trying to make the connection and Avast is blocking access to a site which it considers suspect at the least.