Wow, I've never heard of this scam and I always copypaste the address and never fully check it before sending money. I usually just check the first and the last couple of characters... And while this malware seems to make only the first characters the same while the last ones are different, I'll try to be more vigilant from now on... I've also heard of another scam scheme recently, which involves the QR-codes. It was surprising to read that scammer QR-code generators often appear on the first page of google search. When a person generates a code and someone scans it, it's actually sending money not to the initial address but to scammers. Luckily, I never use QR-codes, but the scam you've mentioned got me thinking that one can never be too careful.