I'd not heard of this... anyone else hear anything about it?
I just read about this in the local paper a couple days ago,and at first I thought the paper had been fooled by a hoax story. But it's legit (the FBI link you gave has a really good explanation).
The tl;dr version:
- criminals used malware to change the DNS settings on computers to point to their own DNS servers. At that point that crime ring effectively controlled what your computer connected to on the Internet.
- the FBI (or other law enforcement) took down the crime ring, and replaced the rogue DNS servers with 'legit' ones
- the FBI will stop running those 'legit' DNS servers on July 9, so if your computer was compromised, it won't work very well on the Internet after that