Image: Rival worms Summary: This sketch shows which pests try to detect or undo rival pests. By Bill Detwiler | July 19, 2006 -- 11:36 GMT (04:36 PDT) Follow @billdetwiler Rival worms Zobot and other worms and variants have hit networks since Sunday. A sketch shows which pests try to detect or undo rival pests, according to F-Secure. Topics: Malware, Security Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.