These reports indicate that in addition to the internal lateral movement already outlined, the WanaCrypt0r ransomware will scan for port 445 on random external IP addresses and if it finds an IP address with an open port 445, it will then scan all devices on the same /24 IP range (i.e. that share the first three octets as that IP address with the open port 445).  In general, WanaCrypt0r does not have C2 capabilities but it does utilize the TOR network to communicate encryption keys for decryption upon payment of ransom.