Wireless sensor networks are ad-hoc low power sensor node has more research in computing directions and denial of communications at routing levels. This paper explores energy draining attack at routing protocol layer, which permanently disable node from network by draining battery power. This Vampire attacks are not specific to the routing protocol layer, but rather rely on the properties of classes of routing protocol. These attacks are difficult to detect and easy to carry out by sending protocol compliant messages. The authors discuss methods to mitigate this type of attack and have proposed the techniques for enhancing energy of nodes.