I'm really sorry to hear that you experienced that. That's really a bad experience and I hope you don't get swayed away with cryptocurrency and learn from your mistakes. You must make amends to that in a way that you wouldn't repeat it.
It's a good practice to check the final transaction and see the address. Sometimes you have to verify as well on your exchange (if that's where you will be transferring) if they made amends to their receiving addresses.
An error that cannot be corrected once done. Rechecking the receiver's wallet address is indeed a good practice for preventing such a massive mistake, but sometimes, we find ourselves in an exciting and swift position where we just want to do things in a hasty manner.
From what I have learned so far, there are viruses that can detect cryptocurrency wallet addresses and then when copied and pasted, they will automatically change the copied wallet address to the hacker's wallet address. The name of this virus is Masad Stealer Malware, or perhaps there are other types of malware that have not been named but have the same mechanism.
Usually, to clean this type of virus, antivirus alone is not enough, but you have to do a complete clean. Several years ago my PC was attacked by this virus and what I know is that the hacker address does not always appear when I press CTRL + V, but more often the hacker address appears when pressing the CTRL + V button when copying my address.
I realized this when I double-checked the last few letters for the address I was going to with the one I pasted. And strangely, when it was removed using the Windows Defender antivirus, this malware returned to activity some time later after the PC was restarted.
I think I am currently experiencing an issue with malware affecting my phone's clipboard. When I copy a bunch of text and switch tabs to paste, there is some kind of unusual interference affecting my copied text. I have taken note of this, which means I must find a quick solution before making my next transaction.