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If any malware was installed, AdwareMedic not only would have located it i but removed it as well.

Changing your passwords and contacted your bank. That shold be sufficient.

We all make mistakes. Don't be too hard on yourself. Your post may save someone else from the same experience so that's a good thing.

You have been told that "adwaremedic" would have detected any password-stealing malware that you installed. That is absolutely false, as the developer of the product would agree. The only kind of malware that the product purports to remove is mere adware, which injects ads into web pages. Even for that use it's unnecessary at best and should not be used. The advice you were given by an Apple employee was merely his or her personal opinion, not an official Apple Support solution, and it was wrong.

Going by your description of what happened, I wouldn't advise you do anything more than you've already done. Whatever information you entered on the scam web page is compromised. You already know that. There's no question of malware here.

Do you think the computer might have been compromised and somehow the people to whom I provided the information could have access to my computer and gain information on other passwords? Should I back up all the data and get the whole system reinstalled to be on the safe side?

No to both.

LetLei wrote:

If i cannot trust adwaremedic, what would advise me to do?

Hello LetLei,

You can trust AdwareMedic. It is just that it is designed for adware only, not key loggers, virus, or other kinds of malware. Adware infections are quite common so if you think you might have one, feel free to download AdwareMedic and run it. It definitely won't hurt anything. Pretty much everyone else in the world thinks AdwareMedic is is the quickest, easiest, and safest way to remove adware.

According to what you have described, there is no reason to be worried - as long as you have changed your passwords. You will need to be extra careful from now on with e-mail and other internet activity. Your e-mail address is definitely in a database somewhere as a good potential victim. They may be able to track you from website to website.

In the future, always make sure that you are the one that initiated any dialog asking for personal information before you provide it. For example, if you get a pop-up telling you your Flash is out of date, close the dialog and quit Safari. Then go to the Adobe Flash site on your own and install the latest version. The same goes for any dialog that pops up unexpectedly. Always say no and double-check yourself.

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The best way to stay safe is not to use software that you haven't researched. Never use any software without a good reason. There is never a good reason to use any kind of "anti-malware" software. No exceptions.