So I was lurking on 4chan's /pol/ and then without any explanation those alerts start emerging.
1.Refresh.BC.Troyan
2.ScrInject.B. Troyan
After that I can no longer see any 4chan boards nor make any threads. Links didn't worked too.
Now I went to 4plebs to see if it was anything working. And voila alerts started emerging again.
So I can no longer lurk or post on 4chan. Already tried it with another PC that never browsed 4chan at all with adblock, noscript and Java disabled, to get the same alerts. So its definitely the server the responsible not an external cause?