AVG Support Community
Hello Danilo. I'm Jovana from senior support and I'll gladly help.
I understand how these "attacks" may seem, and I'm sorry for the worry caused by it, but they are a genuine performance of the Network Inspector feature.
In simple words, AVG Internet Security's feature, Network Inspector, is occasionally running a background scan of network devices, to check for any "weak" or "default" passwords. This is what you're seeing in the mentioned reports.
You can turn this scan off in AVG Internet Security's app:
Menu > Settings > Basic Protection > Network Inspector > uncheck the box next to "Rescan home networks automatically"
If you find any intrusions after you've turned the scan off, please let me know so we can further investigate.
I hope this clarifies. Feel free to write back if you need any other help.