This post came at the right time that I needed it most.
A steemian I know hot his account hacked today and all his sbd transferred to blocktrades. We tried guessing the loophole on how he got hacked but couldn't come to a valid conclusion.
But then, my main suspicion is that he had a trojan app, a keylogger or a clipboard stealer installed on his phone. Maybe he downloaded an app that's not from playstore and he doesn't even have a good antivirus to start with.
I'll try sending this post link to him to read and learn from it.
Also, I've learnt from it too and I'm grateful.
Thanks @rok-sivante for sharing
head's up: this comment of your got posted twice.