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Absolutely. Bitcoin transaction cannot be undone. I would like to draw attention to the virus that has caused a lot of losses recently. It infects you computer and does nothing except it waits until you make a transaction and it changes the address you just copied to another one. Please, guys, double check what you are pasting.
Hmmm, how is that even possible?
Changing one's address during transaction operations, like this is weird though my antivirus is always updated to prevent any form of malwares from harming my computer. People can be so lazy and careless because so many people feels that an address is too long and since it involves combining figures and letters, they find it difficult to run a Cross check before performing an operation but this is just a lazy attitude because it takes someone that have lost a lot of money due to laziness and carelessness to know the importance of making sure an address you are sending your assets to is confirmed thoroughly.
It's not changing one's address during transaction operations, it's changing it
before you make a transaction. You copy an address to which you want to transfer your BTC and you paste it in the field "Pay to" in your wallet, and if you pasted the same address that you copied then your money will go in the right accretion, but it was changed to another address in your buffer and you didn't notice that the address you pasted is different from the address that you just copied and click the "Send" button and confirm it by entering your password, the money will go to the address the malware has provided.