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Hi, i don't think it's a trojan, because it only happend after my upgrade to yomesite, i never connect using the windows 7 , i only used to run some software that i don't have in osx..

The yosemite did an firmware upgrade when I've installed it. So i think yosemite it's the responsal for the corruption in the firmware.

Sadly, no. The problem is the EFI is corrupted before Yosemite realized in the install process your firmware was outdated. But because the area it needed to install was in use it couldn't write all of the code down. This is were the malware was sitting.

Just to be clear if you run Windows within BootCamp you will give this malware enough access to do its dirty deed. We had three systems hit as we too run BootCamp with Windows 7. We hadn't but two and two together realizing it was a malware threat that was the cause. Besides we had mostly updated our systems firmware often enough so we didn't have that many that needed the update. It appears the newer firmware is less susceptible to the risk.

So Dan , the solution is to rewrite the firmware in to the efi chip or to replace the efi chip?

Could the Apple service do that?

Thanks.

Re-burning the chip is a bit tricky as you need more than just the firmware. The best solution is to visit the Apple Store or ship it to Apple. We had ours fixed under warranty. Hopefully you'll get it done under warranty as well.