Since I come to realize that there is thing called clipboard virus which can change the address halfway I have started checking address in middle as well.
My revolution:
copy-paste address blindly >> check first letters >> check first and last letters >> current stage: check first-middle-end letters
I hope it doesn't come to stage where you have check whole address letter by letter

Good realization mate. BTW, I don't think this malware has come to that point to clone an entire/slightly different or half of an address. It hasn't become that capable yet. One thing I'm unsure of is what triggers this virus. Certainly copy pasting casual text won't make it active, while I was infected I only realized after copying a btc address. Another thing is this virus only targets specific address? This is my concern. If it only targeted BTC then other altcoin address won't active it. And sending altcoins to an bitcoin address doesn't make sense, it it? My guess it only targets the big ones such as bitcoin or etheream etc. So if a user is infected and only uses altcoins, there is a big chance he won't detect that he is infected.
Only solution is to always memorize your address (the last part).
Ilost more than 1k$. Unfortunately some of my old address become victim permanent which I used for farming airdrop.
Sorry for your loss. Isn't airdrop a thing of a past now? Currently most of them seemed fake to me.
The reason of this could be installing windows from Third party/Installation of free apps(crack).
Correct answer.
You should have to install the new window/Linux as soon as you can because your phrase or any other information could be compromised.
I did but later I reverted back to windows. I have been using windows my entire life. Felt uncomfortable, not user friendly. Anyway, what distro you use? Any suggestion?