So, some people, mainly in China have been trying to access my account:
Anyone experiencing the same should download Ccleaner, Malwarebytes and/or run your Anti-Virus just to be sure you're not being keylogged.
I've seen a lot of people making threads regarding these emails, and it seems that the guys trying to steal accounts are actually not very "l33t" at what they do, rather they're just using downloadable programs to do gain passwords to unsuspecting account holders.
Password Cracking
The two common types of password cracking programs, I’ll give a brief description on each and how it works.
Brute-Force Attacks: Runs every possible password until the correct one is found. This type of attack generally requires thousands of processors to simultaneously run against a file with an extremely long and highly encrypted password. Commonly used for sensitive, confidential files. But it's easily downloadable to run against anything (your GW2 account) and then doesn't require much resources.
Dictionary Attacks: It runs every possible word in the dictionary until it finds a match. A password such as ‘Football’ would be almost immediately discovered. These are much more common than Brute-Force attacks when trying to crack user passwords.
How to make yourself a secure password
There are a few easy ways to make a difficult password while trying not to forget it yourself.
Mnemonic Passwords: When you generate a phrase that’s easy to remember, then take the first letter from each word to form your password.
For example: ‘I like to drink wine at the weekends’
ILTDW@TW
Letter substitution: You can replace letters with numbers, this makes the complexity of your password more difficult to discover.
For example: The password ‘ChelseaFC’
‘Ch3lse4FC#’
ArenaNet's email authentication has saved a lot of people the annoyance of losing their account and probably getting it banned. However I'd imagine most people probably use the same passwords for their email and login. I'd recommend using different passwords for everything.
Good luck!