My site has seen a spike in direct traffic over the past two weeks that I believe is spam - the bounce rate has taken a hit, average page/sessions has dropped and average time on site is nearly half of what other mediums of traffic are.
Using Analytics, I've been able to pin down culprit to for the strange traffic to Internet Explorer Browser Version 7. During this time period, the bounce rate for this browser is in the high 90s, the pages per session is just above 1 ("visit" the home page and then leave), and the time on site is a few seconds. In terms of location, the traffic seems to becoming from all over the US, so I can't tie it back to any one location.
My question is this, have you experienced this before? And what did you do to stop it?