I'm scared about how someone did this and I wanna know how to prevent it.

So long story short, I was AFK in a Payday2 lobby (wasn't near my PC), a moment ago I came to check something and I see some dude a while ago joined the lobby, said some weird things in another language (Russian I believe) and then said "(MY REAL NAME) Start".

Don't know how this is possible, don't know why this happened or why did it happen, don't know if I'm in danger or not, don't know what to do to prevent this type of shit happening.

Please someone with experience.

submitted by /u/Supreme4025
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from hacking: security in practice https://ift.tt/xTWPnI8