I found out, that ATtiny has a real sensitive input without pull-up. It light up led even if I put my hand over the board without touch... it also light up led if I touch the board on empty space!
Is it broke? ...if not, how can I prevent this happen?
I used this code:
sbic pina, 5 sbi porta, 7 sbis pina, 5 cbi porta, 7