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Wireless Sensor Networks (WSNs) have wide variety of application areas such as military applications, environmental monitoring, health care, home or industrial automation etc. So WSNs are vulnerable to attack, because the sensor nodes are deployed in hostile or unattended environment, they are not temper resistant and the radio links for communication are insecure. There were many schemes proposed for preventing WSN from security threats. The Intrusion Detection System can be implemented for preventing and securing the WSNs from insider attack. A novel intrusion detection framework is proposed for securing wireless sensor networks from routing attacks. This Intrusion Detection System can be implemented with the rules that can be applied for detecting the attacks. The proposed system aims to overcome the drawbacks of existing rule based IDS in WSNs.