If you have a threat like a worm trying to spread over your network, it is crucial to identify the machine(s) that are infected. Those computers need to be isolated and cleaned before the threat can spread. One of the following solutions could help you identify the source:
arp -a > C:\arptablelog.txt
ping 126.96.36.199 -n 1 -w 60000
The 188.8.131.52 represents an non-existant IP address that will not provide an ICMP answer and as a result, will reach the timeout defined.
Using one of these methods can help identify the "attacking computer."