While surfing around on firefox, I suddenly had a pop-up in firefox that told me my computer/files are encrypted and I need to pay to have the files unlocked.
Unfortunately I did click on the "cancel" button on the pop-up window (with no effect), but did not click on anything else. After, I went into task manager and shut firefox down.
Now I am unsure if this was just a pop-up scam, or if anything has been downloaded and is currently infecting my machine. None of my files actually are encrypted as far as I can tell (I have checked a bunch of different files, and they all open just fine). I had both Avast and Malwarebytes running, and they didn't detect anything (nor did they pick up anything on a scan)
So I have no idea if this is a serious threat or just a pop up hoping to scare me to do something stupid. I have since backed all my files to an external drive (and disconnected the drive), and disconnected my PC from the internet. All my files still open fine.
It seems to me if this was a real threat, they would not have given me ample warning to back up all my files and disconnect my PC. But still, is there anything I can do to be sure there isn't some ransomware program waiting to encrypt my PC as soon as I reconnect online?