digraph {
concentrate=true;overlap=scale;"rat=BlackHole" [label="rat\nBlackHole",shape=box,style=filled,color=deepskyblue];"rat=BlackHole" -> "exploit-kit=BlackHole" [label="similar",dir="both"];"exploit-kit=BlackHole" [label="exploit-kit\nBlackHole",shape=box,style=filled,color=deepskyblue];}