Just over a year ago, the FBI announced the bust of six Estonians over malware known as DNSChanger. Read More ..
You'll probably remember that name.
DNS is the system that converts human-friendly names like sophos dot com to computer-friendly numbers like 126.96.36.199.
If a crook can change the DNS settings on your PC, or worse still, on your router, he can sneakily redirect you to an imposter site any time he likes.
To make this hard to detect, he can redirect you only occasionally.
Most of the time, for example, you'll reach your favourite search engine, but every now and then you might end up on his bogus version, with rigged results.