Yelp they trying to hack you
It's a program that you can get at many hacker sites. Even one that Yahoo has put up themselves called yah-hell! It makes you sound like a part of yahoos administration it is keylogged usually but not always if you open it or type anything they will have your pass, ip etc anything really and its not that hard to disable firewalls if you have them or even virus protection trust me I know! So when you get something like that your best bet would be is to go to command prompt if its through messenger and type in echo press enter and leave the window open! This little trick acts like a mirror so anything they try to do it reflects off you and goes straight back to them!
You bet Yahoo can be hacked
First, the security questions are your birthdate and zip code. Your birthdate can easily be found. In the profile Yahoo asks you to create, it shows your age, and if the hacker can figure out the date (there are only 365 days) or find it somewhere else like if you have a personals account, they have it.
The second piece of information they use is your zip code. Again, they ask you for your city in their profile. I think it may even be there by default. If you live in a smaller city, there may be only one zip code.
The 3rd is your "security" question. Well, if you ask them nicely enough, they'll give you what the question is, and you just supply the answer, so if you put in something like they suggest, the answer could be easily guessed.
The problem is that once they get in they are allowed to change your security information and Yahoo will not look back in the records to see what it was before the problem. They won't even look back at the original information. So, once you have been hacked no matter how it has been done, Yahoo refuses to work with you to get it back, even though it is they themselves that allow your security information to be changed.
A persistent hacker and one with a little intelligence can get your Yahoo account easily.
The worst part is this is tied to everything. It is tied to any service you use on Yahoo, paid and unpaid.