DavidR
25
Malware on a system is highly unlikely to be that selective.
Now you are saying every click on the KAT web site, which you weren’t before. Presumably this would be for all pages with the iframe ad to ad.adpurium.com, see #### below.
Effectively you are saying that it wasn’t just on your system but was actually part of avast and I simply can’t see that. I can’t see how a reinstall would have this effect as essentially the only thing that is likely to have changed (assuming that you already had the latest avast version) would be the virus definitions. There is also the possibility that avast has has updated the virus signatures and it is no longer detected.
Unfortunately you are using the reverse logic to me on what is the cause, I still don’t believe it was on your system.
As polonus has mentioned there is an iframe tag to ad.adpurium.com, which is a possible cause of this and since I block ads, and adpurium.com is blocked in AdBlockPlus, I don’t see it (so won’t get an alert).