To clarify. This has happened several times of late with my account, even after having changed my password, that is exclusive to LastPass. LastPass successfully catches the invalid attempts (I also use 2FA), but still, a bit worrying.
I've been having this problem for the last couple of months. Correctly using my (altered several times) password that I don't use anywhere else. The attempts come from the Isle of Man. It could be any of 3 different devices that have been compromised. I've run 5 different keylogging detection programs on my machine and get nothing, so wondering if it's a Chrome extension exploit?
I remember back in the day I used to crack Commodore 64 software, and some of the best protection I remember was when code was written and executed to the RAM in the disk drive, using the intelligent 1541 drive to verify the original disk was in the drive. It was brilliant, and took me longer than any other program to crack. It required the used of a disk memory disassembler, really obscure stuff.
Sierra software used to use multiple encryptions of the original disk-verification code, if I remember correctly. I feel some residual guilt about it now, but I was 14, and honestly, I learned more 6502 assembler cracking code than I ever did writing it. It was like a puzzle. Sorry, Oil's Well developers.