The first question on the minds of most account theft victims is, "How did this happen?" It's a good question, and answering it is the first step in regaining control of your account and plugging any security holes that may exist.
Should your account have been compromised, the following list of types of account theft should help shed some light on how your account was stolen and what steps you can take to prevent any further damage.
Avoiding this kind of theft is easy: just don't share your info. If you did share your information with someone else and you now suspect that your account has been stolen, change your password immediately to avoid any further damage. Also, do not log on from someone else's computer. Even if you practice perfect Internet security at home, you'll waste all that effort if you log on from a friend's machine that has been compromised.
The simplest form of account theft occurs when a user willingly shares login information with another player. This person may be someone you know and trust in real-life, or someone using a tactic called "social engineering" to get your information.
The best way to avoid becoming a victim of a phishing attempt is to exercise caution when receiving any kind of information purporting to come from Blizzard. If an email asks for your password, makes urgent appeals, sounds too good to be true, or links to "account management" sites outside of Blizzard's sites (you can find a list of all official Blizzard domains here), you are dealing with a phishing attempt. Add the sender to your "blocked senders" list, forward the email to hacks@blizzard.com, then delete the email. If you believe you have recently fallen victim to a phishing attempt, change your password immediately.
The practice of "phishing" is the most common strategy used by account thieves. Many cases of people claiming they were "hacked" can actually be traced back to phishing schemes. These emails and websites pretend to be official Blizzard Entertainment communications to trick you into willingly handing out your login information. Here are some signs that you may be dealing with a phishing attempt:
Do not buy gold, and do not solicit power levelers. Frankly, their services are not worth the money or the headache of potential credit card theft, not to mention a permanent ban if you are caught. Factor in the fact that supporting them means making the game worse for everyone, and it becomes clear that what they are offering simply isn't worth it. Read more about the adverse effects of buying gold here.
Gold sellers and leveling services are responsible for the vast majority of all account thefts, and they are the number-one source of World of Warcraft-related phishing attempts, spyware, and even credit card theft. Players who buy gold actively support spam, hacks, and keyloggers, and by doing so diminish the gameplay experience for everyone else.
Be extremely careful when downloading and installing game add-ons. If an add-on asks that you download an executable file, cancel the download immediately. If you believe you have recently fallen victim to a malicious add-on, immediately have your anti-virus software run a full system scan, then change your password.
Some hackers try to turn our community's very creativity against them by injecting computer viruses and other malware (including keyloggers) into otherwise legitimate player-made add-ons. At the very least, this can break your game installation; at the worst, it can lead to irreparable damage to your computer, financial consequences due to credit card theft, or even real-life identity theft.
The most important thing to avoid becoming a victim of a malicious website is to make sure your browser and anti-virus software are up-to-date. Carefully examine any and all links you are presented with, even from close friends. If you believe you have recently fallen victim to a malicious website, immediately have your anti-virus software run a full system scan, then change your password.
Malicious websites target your browser's weak spots by attempting to install harmful software on your computer, with end results similar to malicious add-ons. These sites may be obvious, or they may be designed to look exactly like a Blizzard website. One easy way to tell is by looking closely at the site's URL. If it's not a Blizzard URL but the site claims to be official, you are probably dealing with a malicious website. You can find a list of all official Blizzard domains here.