I have been receiving notices that my blog is "an attack site". It says it comes from google, and that my blog has been reported "once" in the last 90 days.
After I saw that (it even did it to me), I ran my malware and virus software, and NOTHING was found.
The second time I saw the warning, I followed it to its conclusion. It wanted me to pay $100 for software to prevent this from happening. The same thing happened on two blogs I visit regularly.
It is my belief that that warning is a scam to try and get me to pay for something I don't need.
I have no idea how this happens, and I will do the best I can to get to the bottom of it.