digraph g{
  a -> b
  a [label="processed",shape=box,fillcolor="white",style="filled"];
  b [label="{Malware MD5, Malware MD5, ...}",shape=box,fillcolor="palegreen",style="filled,rounded"];

  c -> d
  c [label="type",shape=box,fillcolor="white",style="filled"];
  d [label="{http.user_agent, http.server, ...}",shape=box,fillcolor="palegreen",style="filled,rounded"];
  d -> g [dir=none];
  g [label="e:http.user_agent", shape=box];
  g -> h 
  h [label="{Mozilla...., Mozilla/4.0..., Wget...,... }",shape=box,fillcolor="palegreen",style="filled,rounded"];
  h -> e [dir=none];
  e -> f
  e [label="v:MD5('Mozilla....')",shape=box,fillcolor="white",style="filled"];
  f [label="{Malware MD5, Malware MD5, ...}",shape=box,fillcolor="palegreen",style="filled,rounded"];
  
  z [label="key", shape=box];
  y [label="set", shape=box, fillcolor="palegreen",style="filled,rounded"];

}