JerryBox

@dprout69 I am really amazed you told straight away the one who broke into my system had my router password. Just curious - how did you know?

I appreciate your help guys. I just didn't expect someone can hack me knowing ONLY my WiFi password. I've deactivated the admin account and changed passwords. I've found strange chinese MAC addresses having connected to my WiFi recently. I'm going to reinstall Windows very soon. One of my computers has professional Windows and I've never traced any signs of intrusion on it, unlike on another one, which has Windows Home. I've heard professional Windows are safer, could it have prevented the hackers from breaking into that computer? If so, is there a need to reinstall windows on that one too? Lastly, should I be worried about the security of smartphones which i connected to WiFi with?

@dprout69Thanks for your help. Only after reading your comment I've realized what an idiot I was. I'm an airbnb host and gave all my guests my regular WiFi password, not a guest one... Could they have connected to my computer from a distance? There was a strange piece of software installed on the day of the incident. It's called ms:resource:appDisplayName and I can't uninstall it. I'll probobly reinstall windows to be completely safe. To answer your question, I use the default windows firewall.

I closed my laptop without locking the screen, assuming it's going to lock by itself. Don't know if it did. In a while I heard the famous windows "ding, ding" sound for a few times but didn't pay any attention. After some time I heard it again and decided to look what's going on. I opened my laptop and was shocked to see what's going on. The screen wasn't locked. I saw lots of different windows open: bit defender, malware bytes, web browser with different searches, my onedrive folder and many others. A totally different user was signed in (the built in Windows Administrator), therefore the desktop background was different and all the files of my own user were invisible. I ran my Bitdefender and Malwarebytes - they said everything was safe. I restarted my PC and it logged straight into the admin account without asking to enter a password. I've never used or even enabled this account. It's more than obvious I have been hacked. 1. I know I should uninstall malicious software, but how can I know which software is malicious, if Malwarebytes finds nothing? I don't trust myself to go through files with strange names and delete files manually using my own discretion. 2. How come Malwarebytes Premium and Bitdefender didn't prevent this from happening? It really raises the question what I'm actually paying money for. These programs are saying everything is ok, when quite obviously something is wrong. 3. What should I do?