Bitcoin Forum

I never tested this guy but as far as I know ,It works just fine. this document has been first released by Quickseller (somewhere in the forums , I can't find the post though) , and It was blockchain.info who gave it to him when he contacted them but still... use it at your own risk as It's not that user-friendly guide : https://docs.google.com/document/d/1-2l6xOqcbjs9QWEqSh72RD1d8EEdvG_hQuEXw_f_o6w/edit

So... It's easy for a infected machine give the keys to a hacker?

Well, trust no one, be your own bank...

This is valid for every wallet out there and not only blockchain.info , If your machine is infected and you export the private keys or even type the password of the wallet then you are probably screwed.
I'm giving this guide to "Be your own bank" , as unless you have your private keys , you are not controlling anything.

I heard they have added some new functionality to their new version of wallets so that we will be able to extract private-keys so quick and more similar to old version ?

Still, I believe having a tutorial for this must be a good idea and I like to suggest to have same as how Shorena presented for signing a message instead of having your steps in google document.

Nice tutorial and for a service like blockchain.info which has absolutely the highest number of hacks in bitcoin history is greatly needed. However in an infected machine the only choice is a hardware wallet as they are malware proof. Just install the hardware wallet for the first time in a freshly formatted machine to have peace of mind.

Do not forget that even though an href says google.com, that is simply the label that the coder put on it and it can go anywhere and even start a script.

I will have a very close look at this. I hesitated opening the link seeing the word javascript, lol.

As a precaution, I always copy the link, paste it and then go forward if it is the same as it was labeled. 

If you machine is infected and hackers have full access to it, then do you think it will be that big of difference to steal private keys of your local wallet?
In some cases (when you have 2FA enabled and all security options set) it will be harder for anyone to break into your blockchain.info online wallet.

If the wallet was encrypted they have easily access too?
2FA is good but in this case, if the hackers stolen the private keys, it will have no value. Well, lets keep the pc clean to avoid hackers

If it's an online wallet like BLockchain.info (where the service has no information's in their servers) then yes , since the wallet will get decrypted in your browser as far as I know and that should give the hacker a way to hack you.
As for desktop wallets ,If your machine is infected (there will be most likely a Keylogger on it) , as soon as youe type the password to decrypt the wallet , RIP funds.